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Publisher: Indian Council of Agricultural Research   (Total: 6 journals)   [Sort by number of followers]

Showing 1 - 6 of 6 Journals sorted alphabetically
Fishery Technology     Open Access   (Followers: 2)
Indian Horticulture     Full-text available via subscription   (Followers: 10)
Indian J. of Agricultural Sciences     Open Access   (Followers: 8, SJR: 0.238, h-index: 18)
Indian J. of Animal Sciences     Open Access   (Followers: 7, SJR: 0.233, h-index: 16)
Indian J. of Fisheries     Open Access   (Followers: 2, SJR: 0.154, h-index: 5)
Indian Phytopathology     Open Access   (Followers: 2)
Journal Cover Indian Phytopathology
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   ISSN (Print) 0367-973X - ISSN (Online) 2248-9800
   Published by Indian Council of Agricultural Research Homepage  [6 journals]
  • Progressive steps in understanding and solving guava wilt - a national

    • Authors: A.K. MISRA
      Abstract: At the outset, I wish to convey my gratefulness to all the members of the Indian Phytopathological Society for unanimously electing me as President of this prestigious Society. I pay my tributes to all the eminent Plant Pathologists of India and past Presidents of the Indian Phytopathological Society, who have nurtured the society, brought international recognition for the society and contributed significantly for the subject. I feel humble and privileged to deliver this presidential lecture for the year 2015. I have selected a subject in which I have spent more than 20 years of my active research period i.e. guava wilt which is a ticklish problem.
      PubDate: 2017-03-23
      Issue No: Vol. 70, No. 1 (2017)
  • Diseases of medicinal and aromatic plants: Insights in nematode

    • Authors: RAKESH PANDEY
      Abstract: The cultivation of medicinal and aromatic plants (MAPs) has considerably increased in tropical and sub tropical countries of the world to meet the requirement of pharmaceutical, perfumery, cosmetic and food industries. Unfortunately, the major source of raw materials are highly susceptible to many diseases caused by variety of pest and pathogens viz. fungi, bacteria, viruses, phytoplasmas, insects and nematodes, which are responsible for severe loss in crop production/ yield and also affecting loss of major genetic resource of MAPs too. Therefore, the disease caused by such pest and pathogen is a major limiting factor for the successful cultivation of major medicinal and aromatic plants. Although, chemical control of plant diseases has proved effective but it cannot be recommended to the farmers due to its high cost and adverse impact on non target organism, human, animal and environmental health. Due to enormous use of medicinal plants in herbal medicines, maximum care is the need of the hours to manage diseases of MAPs. Some of the other alternatives for disease management are available in medicinal and aromatic plants like resistant germplasm, useful organic materials, effective biocontrol agents and other cultural/physical method. Such resistant and tolerant germplasm could be exploited in future plant breeding programmes for developing resistant/ tolerant genotypes against major pest and pathogens. Various organic materials are available which have been proven useful to decrease disease incidence and enhanced MAPs yield and which could also be used in ongoing programmes for better and healthy plants. Large numbers of bio agents are available which could also be used on large scale to protect MAPs against various pest and pathogens. However, much attention is needed to study and develop a new strategy to mange major diseases in an ecofriendly way, which should be cost effective and environmentally friendly.
      PubDate: 2017-03-23
      Issue No: Vol. 70, No. 1 (2017)
  • Growing with wheat and barley rusts for three decades

    • Authors: S.C. BHARDWAJ
      Abstract: I feel honoured and elated for being conferred S.N. Dasgupta memorial award. I am grateful to the Indian Phytopathological Society to bestow this honour upon me which is named after one of the great Scientists of all the times. Dr. Dasgupta belonged to a family of distinguished people. He did pioneer research on physiological plant pathology, was an excellent Fungal taxonomist who rose to become the Vice Chancellor of Kalyani University, a position he served for two terms. I think he would have been very happy today to see that I would be discussing very important disease rust and sharing my experience with this august gathering, on ways and means to secure wheat. This crop is synonym to economic health and nutritional security of many countries with India no exception. Today we remember Dr. Dasgupta for the work done by him for the progress of biosciences and this lecture is a tribute to the great soul.
      PubDate: 2017-03-23
      Issue No: Vol. 70, No. 1 (2017)
  • Genomic insights into the adaptation to parasitism in nematode - trapping
           fungi and transcriptomics during infection of Caenorhabditis briggsae and
           plant-parasitic nematodes

      Abstract: Nematode-trapping fungi are a group of soil living microorganisms that form special adhesive and mechanical trapping structures to capture and kill the nematodes. Nematode- trapping fungi belong to a family Orbiliaceae of Phylum Ascomycota. Many plant parasitic nematodes species are destructive plant pathogens which resulted in an interest to use nematode-trapping fungi as bio control agents of plant parasitic nematodes. We used the comparative genomics and transcriptomics to gain insights in to the adaptation to parasitism in nematode-trapping fungi. We sequenced the genome of Monacrosporium haptotylum and compared with the genome of the adhesive net forming species Arthrobotrys oligospora. The genome assembly contains 40.4 million base pairs and 10959 genes. We found that two genomic mechanisms are likely to be involved in the evolution of parasitism in nematode- trapping fungi. First, gene duplications leading to formation of novel genes and expansion of gene families resulting in a large number of species – specific genes. Many of these genes were highly expressed and upregulated during infection of Caenorhabditis briggsae. Second, the differential gene expression of orthrologs between the two fungi during infection, suggest that the differential gene expression has been an important mechanisms for evolution of parasitism in nematode-trapping fungi. We also studied the transcriptome expressed by Arthrobotrys oligospora, Monacrosporium cionopagum and Arthrobotrys dactyloides during infection of root-knot nematode Meloidogyne hapla and sugar beet cyst nematode Heterodera schachtii. Comparative transcriptome analysis during infection process including trapping, penetration and digestion of Meloidogyne hapla and Heterodera schachtii by nematode-trapping fungi showed that the divergence in gene expression pattern associated with fungal species was significantly larger than that related to the host nematode species. Genes that were highly expressed in all nematode-trapping fungi encoded endopeptidases, such as peptisase_S8, peptidase_M3 and aspartic proteases; cell-surface proteins containing the carbohydrate-binding domain WSC; stress response proteins; membrane transporters; transcription factors; and cell singling genes containing the Ras domain. Transcripts containing the Ricin-B lectin and Atg8 domain were also highly expressed in all nematode- trapping fungi. Differentially expressed transcripts among the fungal species encoded various lectins, such as the fungal fruit-body lectin and the D-mannose binding lectin; transcription factors; cell-signaling components; proteins containing a WSC domain; and proteins containing a DUF3129 domain. Interestingly, DUF 3129 was highly expressed in M. cionopagum but not expressed at all in A. dactyloides. Differentially expressed transcripts during infection of different host nematodes, including peptidases, WSC domain proteins, tyrosinases, and small secreted proteins with unknown function.
      PubDate: 2017-03-23
      Issue No: Vol. 70, No. 1 (2017)
  • Management of chilli (Capsicum annuum) anthracnose using fungicides and
           biocontrol agents

      Abstract: An antagonistic Burkholderia sp. strain TNAU-1 and the fungicide, Cabrio Top were evaluated for their efficacy in suppressing mycelial growth of chilli anthracnose pathogen isolates of Colletotrichum capsici, C. gloeosporioides and Alternaria alternata in vitro. Antagonistic bacterium inhibited the growth of all the aforementioned pathogenic isolates in dual culture on PDA medium and the inhibition zone ranged from 10.7 mm (CBE1) to 16.0 mm (TEN10). The test fungicide Cabrio Top was highly effective in suppressing the radial growth of all the test fungi with minimal inhibitory concentration at 250 ppm. In the field trial, Cabrio Top at @ 1750 g/ ha was found to be most effective in controlling anthracnose and increasing yield. Control plots recorded the lowest yield of 2132 kg/ha and 2507 kg/ha in Trial I and Trial II, respectively. Cabrio Top @1750g/ha recorded the highest yield of 3091kg/ha and 3304 kg/ha in Trial-I and Trial-II, respectively. Foliar application of powder formulation of Burkholderia sp. strain TNAU-1 showed a comparable level of disease control and increased the yield to that of foliar application with Cabrio Top under field conditions.
      PubDate: 2017-03-23
      Issue No: Vol. 70, No. 1 (2017)
  • Anthracnose disease of walnut (Juglans regia) in Kashmir valley

      Abstract: Walnut anthracnose is one of the most important disease of walnut (Juglans regia L.) worldwide. In earlier stages of the disease development, spots are circular light brown slightly sunken which later on turned dark brown in colour with irregular margins. Maximum disease development in the field was observed during August and spots attained maximum size of 27-29 mm. The disease symptoms on the twigs initially appeared as dark brown oval lesions which later on turned black in colour with irregular margins attained maximum size of 26-27 mm. The pathogen produced white glaborus raised colony, which later turn creamy white to grayish white with well-defined lobate margins and concentric zones. Acervulus (113.48-190.49µm) appears in concentric rings having hyaline guttulated, crescent conidia (23.58 × 10.13µm). Maximum mycelia growth was achieved on corn meal agar, whereas potato dextrose agar proved to be best media for sporulation of isolated  pathogen (M. juglandis). The fungus requires incubation period of 14-18 days to produce symptoms on potted walnut seedlings.
      PubDate: 2017-03-23
      Issue No: Vol. 70, No. 1 (2017)
  • Bio-efficacy of Trichoderma spp. and its liquid culture filtrate on
           mycelial growth and management of onion black mould rot (Aspergillus niger
           Van Tieghem) in vitro and in vivo

    • Authors: B.K. PRAJAPATI*; R.K. PATIL
      Abstract: Black mould rot of onion incited by Aspergillus niger is an important post-harvest disease of onion under storage conditions and cause extensive losses. The present study was undertaken to assess the bio-efficacy of Trichoderma spp. and its culture filtrate in management of black mould rot in vitro and in vivo. Significantly lowest mycelial growth (19.00 mm) with highest mycelial growth inhibition was recorded in T. asperellum (78.89%) after 7th day of incubation in vitro. In vivo, pre-inoculation treatment with T. asperellum found significantly superior in reducing the black mould rot severity (0.00 and 0.06%) on 7th and 14th day after inoculation, respectively over control (21.67 and 29.33%). A similar trend was noted in post-inoculation treatment (0.16 and 0.33%) over control (23.00 and 29.67%). Significantly lowest mycelia growth (10.67 mm) with highest mycelial growth inhibition was recorded in liquid culture filtrate of T. harzianum (88.14%) over control. In vivo, pre-inoculation treatment with liquid culture filtrate of T. asperellum, T. harzianum and T. viride were found significantly superior showing no black mould rot severity on 7th and 14th day after inoculation over control (14.00 and 27.67%). In post-inoculation treatment T. asperellum, T. harzianum and T. viride were found significantly superior showing no black mould rot severity on 7th and on 14th day after inoculation over control (17.33 and 26.33%).
      PubDate: 2017-03-23
      Issue No: Vol. 70, No. 1 (2017)
  • Resistance in urdbean against yellow mosaic, leaf crinkle and Cercospora
           leaf spot diseases in natural epiphytotic condition at Keonjhar district
           of Odisha

      Abstract: The present investigation aimed to identify resistance in urdbean (Vigna mungo) against yellow mosaic disease (YMD), urdbean leaf crinkle disease complex (ULCD) and Cercospora leaf spot (CLS) in a field trial conducted at Regional Research and Technology Transfer Station, Keonjhar (AICRP on MULLaRP sub-centre), OUAT, Odisha. Twenty four urdbean genotypes were screened in the summer season of the year of 2012- 2013 and 2013-2014. The severity of YMD and CLS was recorded following 0-9 scale and disease incidence was accounted for ULCD. The urdbean genotypes evaluated were grouped into different categories based on disease reaction. The present results indicated that genotype P-104 was immune to YMD, CLS and ULCD, two genotypes, P-102 and P-103 exhibited resistance to YMD and CLS and P-101 showed susceptibility to YMD but immune to CLS. Two genotypes PU 14-11 and P-107 showed highly resistance to both YMD and CLS but susceptible to ULCD. The genotype PU 14-7 showed moderately susceptible to YMD and CLS but immune to ULCD. Rest of the genotypes were moderately to highly susceptible. It is concluded that 3 genotypes (P-104, P-102 and P-108) could be exploited for resistance breeding of urdbean against YMD, CLS and ULCD and P-104, PU 14-7 and PU 14-1 for ULCD. The urdbean genotypes P-105, P-108, P-109 and PU 14-1 could be the choice for resistance against ULCD.
      PubDate: 2017-03-23
      Issue No: Vol. 70, No. 1 (2017)
  • Molecular characterization and phylogenetic analysis of coat protein gene
           of Leek yellow stripe virus infecting garlic in India

      Abstract: The coat protein (CP) gene of two isolates of Leek yellow stripe virus (LYSV) from India was sequenced and found to be 864 bp, encoding a protein with 288 amino acids. The CP sequences of both the isolates were deposited in GenBank with accession numbers KF724857 and KP168262 corresponding to the isolates AC-50 and PGS-14, respectively. The Indian isolates of LYSV shared maximum nucleotide (nt) and amino acid (aa) identities of 85% and 90% with Myanmar isolate (AB551622) respectively. Nt and aa based sequence identities of two Indian LYSV isolates with the corresponding sequences of 34 other LYSV isolates from worldwide revealed that, Indian isolate shared 77-84% and 80-90% identity respectively among themselves. It showed 5.3 % diversity between the Indian isolates and 23 % diversity among the isolates reported worldwide. Amino acid sequence comparison showed a significant variability at N-terminal region of CP gene of LYSV. Phylogenetic analysis of CP sequences of 36 isolates comprising India and other isolates from world segregated them into two major groups (major group I and major group II). The Indian isolates were clustered with isolates of Myanmar (AB551622) and Japan (AB194640) in subgroup III of major group II. The phylogenetic analysis revealed that Indian isolate is closely related to an isolate from Myanmar (AB551622). The present study comprises the first report on unravelling the molecular variability existing among the LYSV isolates.
      PubDate: 2017-03-23
      Issue No: Vol. 70, No. 1 (2017)
  • A comparative virulence analysis of Bipolaris sorokiniana based on host
           pathogen interaction and its toxin

      Abstract: Bipolaris sorokiniana is a hemibiotrophic fungus causing spot blotch of wheat and barley. The pathogen produces phytotoxins in culture that induces necrosis and play role in pathogenesis. Our results indicated the existence of variability based on host interactions with pathogen and toxin produced by the pathogen, separately. Twelve isolates of B. sorokiniana showed differences in disease reaction on wheat differential hosts. BS 25 was identified as most virulent and BS 7 as least virulent isolate. These two selected isolates further showed differences in the intensity of toxin band when resolved by thin layer chromatography (TLC). The grades of symptoms produced by the toxin of these isolates were similar to those produced by the respective pathogen isolates. Besides producing necrotic lesion on wheat the partially purified toxin caused necrotic lesions on barley, maize and sorghum studied using leaf infiltration bioassay.
      PubDate: 2017-03-23
      Issue No: Vol. 70, No. 1 (2017)
  • Association of Meloidogyne graminicola in twister disease of onion: an
           emerging problem in coastal tract of India

      Abstract: Onion crop grown in west coast of sothern India has been seriously affected by the problem of onion twister disease charetorized by the symptoms viz., twisting of leaf and neck, slight to prominent galls in roots with root proliferation and scanty discolored root system. A survey carried out during rabi/summer of 2011-12 and 2012-13 revealed the prevalence of such disease in all the major onion cultivating areas of Karnataka (India). The highest disease index of 24.05 and 29.37 per cent was noticed Uttar Kannada district during 2011-12 and 2012-13 respectively. Aetiological investigations revealed the association of a nematode with symptomatic onion plants having root galls. Nematode when inoculated, resulted in slender plants with typical abnormal elongation of leaf with proliferation and neck twisting during initial stage and at later stage whole plant appeared to be abnormal showing typical twisting symptoms. Artificially inoculated plant with typical symptoms were found to have severe galling with typical hooks like roots. At later stage discoloration and complete destruction of root system demonstrated the Koch’s postulate for the involvement of isolated nematode in the disease. Identity of the nematode was confirmed as Meloidogyne graminicola by morphometric and perineal pattern studies. This is the first report of association of rice root knot nematode involved in onion twister disease.
      PubDate: 2017-03-23
      Issue No: Vol. 70, No. 1 (2017)
  • Assessment of slow rusting resistance components to stripe rust pathogen
           in some exotic wheat germplasm

      Abstract: Stripe rust caused by Puccinia striiformis f. sp. tritici is one of the most destructive diseases of wheat. It is emerging as an important constraint to wheat production worldwide and northern India. Host resistance is the most economical way of controlling respective pathogen. However, race-specific resistance is overcome by the evolution of new races of the pathogens. Conversely, race non-specific or quantitative resistance, controlled by many genes and effective at the adult plat stage, is generally considered more durable and long lasting. Such type of resistance is of primary interest to wheat breeders around the world. With this background, experiments were conducted to assess the levels of slow rusting/adult plant resistance in exotic wheat germplasm (CIMMYT Mexico Core Germplasm Panel, CIMCOG). Sixty two exotic wheat germplasm including susceptible checks were evaluated against yellow rust for resistance both at seedling as well as adult plant stages. Slow rusting/partial resistance/adult plant resistance was assessed under field conditions through host response and epidemiological parameters estimates i.e., final rust severity (FRS), coefficient of infection (CI), relative area under disease progress curve (rAUDPC) and apparent infection rate (r). Promising slow rusting resistance was observed on the germplasm viz., CIMCOG 1, 2, 3, 5, 6, 7, 12, 14, 15, 17, 18, 20, 21, 22, 26, 27, 28, 29, 32, 33, 34, 35, 36, 38, 40, 43, 46, 47, 49, 52, 53, 58, 59 and 60 consistently during rabi seasons of 2013-16. All these promising stripe rust resistant germplasm at adult plant stage were susceptible at seedling stage to yellow rust, which indicated presence of slow rusting resistance among the germplasm. Significant diversity was observed for level of slow rusting resistance among the CIMMYT core wheat germplasm, which may be exploited in further breeding strategies to develop consistent and durable resistant varieties against stripe rust in India.
      PubDate: 2017-03-23
      Issue No: Vol. 70, No. 1 (2017)
  • Moisture and nitrogen stress induces severity of wilt-nematode complex of
           lentil grown in rice fallow in an Inceptisol

      Abstract: Lentil (Lens culinaris) is a leading high protein pulse grown by the farmers as a rainfed rabi crop in lowland rice fallows in Indo Gangetic Plains (IGP) of India. Disease complex due to Fusarium oxysporum and Meloidogyne incognita possess a great threat to yield of lentil when grown as fallow crop after rice with residual soil moisture and nitrogen in dryland condition. This paper discusses the role of soil moisture and availability of soil NO3-N to the plants on wilt nematode disease complex under a long term rice-lentil cropping system. In our long term experimental conditions which prevailed under dry condition, low level of soil moisture and low availability of soil NO3-N to plants illustrated increased in fungus nematode wilt complex severity which can be mitigated by use of farm yard manure as full source of nitrogen in rice. This leads to the enhancement of the available soil moisture and nitrogen for residual crops like lentil and also reduced wilt nematode complex.
      PubDate: 2017-03-23
      Issue No: Vol. 70, No. 1 (2017)
  • Identification of multiple disease resistant maize accessions

      Abstract: Maize (Zea mays L.; 2N=20) is an important cereal crops of the country and grown over an area of 8.67 million ha. Maize is grown in more than 150 countries and contributes a lot to nutritional food security of the society. Maydis leaf blight and Banded leaf and sheath blight diseases are the most important foliar diseases of kharif season causing immense losses in yield. Both the diseases are of high damaging potential, so large number of normal maize hybrids of different maturity groups along with specialty corn hybrids were screened against both the diseases during kharif 2014 under artificial inoculation conditions at Karnal and Delhi. In late maturity group, one hybrid namely DAS-MH-105 was observed as resistant to MLB and BLSB based on average of both the locations. Twelve hybrids including HM 8-C, DKC 9144 (IM8478), AQH 9 and Kuber Shakthi were recorded as moderately resistant for normal maize of medium maturity group. Seven and three hybrids exhibited moderately resistant reaction for early and extra early group, respectively. CMH 10-531of early maturity group was found moderately susceptible to both the diseases. In case of specialty corn hybrids including VEHQ 11-1 and HQPM1-C for quality protein maize; HPC 1 and BPC 3 for pop corn; ADVSW-1 and Bisco MaDHAU for sweet corn and BVM-2 for baby corn were registered under moderately resistant category against MLB and BLSB diseases, while few of pop corn hybrids showed moderately susceptible reaction.
      PubDate: 2017-03-23
      Issue No: Vol. 70, No. 1 (2017)
  • Pathogenicity of Rhizoctonia solani AG 1-IA on major weeds prevalent in
           rice and maize ecosystem in Meghalaya

      Abstract: Rhizoctonia solani Kühn (Teleomorph: Thanatephorus cucumeris) is an economically important soil borne basidiomycetous pathogen of worldwide distribution. It causes sheath blight disease of rice and banded leaf and sheath blight (BLSB) disease in maize. Twenty three lowland rice weeds and thirty one upland (maize) weeds were collected and used. Rice isolate (SRS) was pathogenic on all the lowland rice and upland weeds. Maize isolate (RSM2) was not pathogenic on Cyperus difformis, C. haspans, C. odoratus, Sagittaria sagittifolia, Celosia argentea, Commelina diffusa and Floscopa scandens. Minimum days for scleriotia formation was 3 days on C. bengalensis, maximum sclerotia production was observed on Echinochloa crusgalli (14 nos.) with the isolate SRS. Minimum days for sclerotia formation was 2 days after inoculation on Euphorbia hirta, Fimbristylis dichotoma, Rotala indica and Scirpus juncoides. Maximum sclerotia production was observed on Alternanthera philoxeroides (11 nos.) with the isolate RSM2. Area under disease progress curve was calculated and mean separation was done using REGWQ test (Ryan/Elinot/Gabriel/Welsch procedure). The weeds Ageratum houstonianum (10.2), A. sessilis (14), A. philoxeroides (25.3), Imperata cylindrica (14), Paspalum distichum (17.8) and Ambrosia artemisiifolia (23.3) were susceptible whereas Dactyloctenium aegyptium (115.6), E. colona (115.6) and Bidens pilosa (111.9) were highly susceptible to the isolate SRS. The weed A. houstonianum (43.7) was susceptible and R. indica (267.4) and E. hirta (266.2) were highly susceptible to the isolate RSM2.
      PubDate: 2017-03-23
      Issue No: Vol. 70, No. 1 (2017)
  • Antioxidant properties of some common oyster mushrooms grown in North East

      Abstract: Six oyster mushrooms, viz., Pleurotus ostreatus (Jacq. ex Fr.) P. Kumm., P. solidus (Schulz.) Sacc., P. djamor (Rumph.) Boedijn, P. florida (Mont.) Singer, P. sajor-caju (Fr.) Singer and P. citrinopileatus Singer were evaluated for their antioxidant properties. The antioxidant activity was more in pink coloured species (the highest in P. djamor, followed by P. ostreatus, and grey mushroom P. sajor-caju) than the white species (P. florida, P. sapidus and P. citrinopileatus), which established the positive effect of fruiting body pigmentation on antioxidant properties. A strong correlation between phenolic content and antioxidant activity was observed for all the species investigated. P. citrinopileatus showed higher chelating and radical scavenging effects than P. florida though it contained lower amount of phenol than P. florida. The investigation revealed the antioxidative potential of the pigmented mushrooms, viz., P. djamor and P. ostreatus. These species, enriched with beneficial bioactive components, have much potential for inclusion in breeding programmes and should be popularized for cultivation purpose.
      PubDate: 2017-03-23
      Issue No: Vol. 70, No. 1 (2017)
  • Evaluation of pea genotypes for resistance against powdery mildew caused
           by Erysiphe pisi

      Abstract: Powdery mildew of pea caused by Erysiphe pisi DC ex. Saint-Amans is of common recurrence and destructive disease in wet and dry temperate regions of Himachal Pradesh where pea is an important off-season crop. The disease is more prevalent at flowering and pod formation stage and appears in epidemic form almost every year in India and other countries of world. The disease is of utmost importance in Himachal Pradesh as the crop is grown throughout the year in different agro climatic zones of state. Yield losses upto 47 per cent have been reported due to powdery mildew in India by different workers. One of the options for disease control is the use of resistant cultivars. In the present study, 310 germplasm lines of pea (Pisum sativum L.) were screened under net house and artificial epiphytotic conditions under greenhouse. Out of 310 lines, under both i.e. net house and in vitro, a total of 31 lines viz., HFPU, P-1797, P-1783, P-1052, HFP-7, HFP-8, P-1808, P-1820, P-1813, P-1377, P-1422-1, P-1811, IPF-99-25, KMNR-400, LFP-566, LFP-569, LFP-552, LFP-573, JP-501-A/2, PMR-21, KMNR-894, P-1280-4, P-1436-9, P-200-11, IPFD-99-13, HVDP-15, DPP-43-2, LFP-517, LFP-570, JP Ajjila and JP-15 showed highly resistant reaction against powdery mildew.
      PubDate: 2017-03-23
      Issue No: Vol. 70, No. 1 (2017)
  • Field evaluation of talc formulation of Trichoderma for the management of
           Fusarium wilt in watermelon

    • Authors: R. RAMESH*; N.P. SINGH
      Abstract: Wilt of watermelon caused by Fusarium oxysporum. f.sp. niveum is one of the major constraint in watermelon production in coastal regions. In this study, twenty seven isolates of Trichoderma were evaluated for their ability to inhibit the pathogen growth. Talc formulations of four selected Trichoderma isolates were evaluated in the field. Incidence of wilt in the biocontrol treatments was less than 10 per cent in trial 1 and less than seven percent in trial 2 and less than four per cent in trial 3 during 2012-13 while control plot recorded 21 to 34 per cent incidence. During 2013-14, incidence of wilt was less than seven per cent in trial 1 and less than 15 percent in trial 2 in the biocontrol treatments while control plot recorded 19 and 28 per cent incidence. From the pooled data of all the five trials it was observed that 70 to 80 per cent reduction of wilt and 27 to 30 per cent increase in number of fruits in biocontrol treated plots over untreated control. From the study, it is concluded that seedling drench with talc formulation of Trichoderma reduced Fusarium wilt and increased yield in watermelon.
      PubDate: 2017-03-23
      Issue No: Vol. 70, No. 1 (2017)
  • Epidemiology of mouldy core and core rot of apple in Himachal Pradesh,

      Abstract: Mouldy core and core rot of apple caused by Alternaria alternata has emerged an economically important disease in Himachal Pradesh, India causing direct losses to the growers. The fungus remains dormant inside the calyx of the fruit and later becomes active when the starch content of the fruits get converted into sugar and hence causes the post harvest disease, where the rotting of the fruits starts from the core region. In vitro studies on the effect of temperature and relative humidity on the growth of the conidia of Alternaria alternata causing mouldy core and core rot of apple revealed that, the temperature of 30°C and 100 per cent relative humidity were optimal for conidial germination. Among different weather parameters, cumulative rainfall was directly correlated with disease development. Regression analysis further showed that 91.00 per cent variation in pre-harvest fruit drop was due to mouldy core and core rot. Medium sized Starking Delicious apple fruits with open sinus/calyx tube and length: width ratio falling in 0.96 to 1.05 mm showed maximum incidence of mouldy core and core rot in the field.
      PubDate: 2017-03-23
      Issue No: Vol. 70, No. 1 (2017)
  • Evaluation of Pseudomonas fluorescens isolates for the management of
           Fusarium oxysporum f.sp. lycopersici and Rhizoctonia solani responsible
           for causing wilt complex in tomato

      Abstract: Twenty-five isolates of Pseudomonas fluorescens were isolated from healthy plants of tomato on Kings’B medium, for exploring their bio-efficacy potential against Fusarium oxysporum f.sp. lycopersici and Rhizoctonia solani, responsible for wilt complex disease. Out of all, six isolates (I-7, I-15, I-18, I-23, I-24 and I-25) significantly inhibited the growth of both fungal pathogens under laboratory conditions. Under green house conditions, bacterization of tomato seeds with these six isolates of P. fluorescens in pathogen infested soil significantly reduced the incidence of disease caused by F. oxysporum f.sp. lycopersici and R. solani, with maximum (12.50 and 10.41%) by isolate I-23, and simultaneously increased the plant growth parameters. Application of isolate I-23 also resulted in maximum per cent germination, shoot length and root length of 80.00 and 77.50 per cent and 54 and 38 cm and 16.27 and 11.97 cm, respectively as compared to their untreated control.
      PubDate: 2017-03-23
      Issue No: Vol. 70, No. 1 (2017)
  • Resistance in Indian wheat and triticale against loose smut caused by
           Ustilago tritici

      Abstract: A total of 988 numbers of wheat and Triticale varieties and genotypes were evaluated against loose smut at hot spot locations, Almora in Northern hills zone, Ludhiana, Hisar and Durgapura in North Western plains zone of India under artificially inoculated conditions using local isolates of loose smut (Ustilago tritici) pathogen from 2007-08 to 2011-12 crop seasons. Ninety four genotypes and varieties of wheat and Triticale were found highly resistant (free from infection) whereas 20 genotypes and varieties were found resistant (0.1-5.0% infection) over years and locations. The wheat varieties, HS 277, KRL 210, MACS 2846, MACS 2971, VL 829 A-9-30-1, GW 1189, HD 4672, HI 8498, HI 8627, HI 8663, MPO 1215, NIDW 295, PDW 233, PDW 291, WH 896 NP 200 were highly resistant. These may be used for breeding for disease resistant as resistant donor parents and resistant wheat varieties may be deployment in disease endemic areas.
      PubDate: 2017-03-23
      Issue No: Vol. 70, No. 1 (2017)
  • Screening of Pear Germplasm against Entomosporium leaf and fruit spot

    • Authors: S. ALTAF; T.R. RATHER*, N.A. KHAN Z.A. BHAT
      Abstract: Fourteen pear varieties were screened under polyhouse conditions for their tolerance/susceptibility against the pathogen. One year old healthy grafted plants of fourteen pear varieties were planted in 50 cm diameter plastic pots containing sterilized soil and were kept under polyhouse conditions equipped with sprinkler irrigation facility. The results revealed that only one cultivar i.e. Starkrimson exhibited immune reaction and six other cultivars viz., Fertility, Beurré hardy, Beurré Clairgeau, Clapp’s favorite, Citron-Des-Carmes, and Max Red Bartlett were rated as moderately susceptible. The remaining cultivars viz., Chinese sandy pear, Conference, Cosia C, Cosia F, Bartlett, Red Anjou and Beurré-DeAmanalis exhibited highly susceptible reaction.
      PubDate: 2017-03-23
      Issue No: Vol. 70, No. 1 (2017)
School of Mathematical and Computer Sciences
Heriot-Watt University
Edinburgh, EH14 4AS, UK
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