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Chaudhary Sarwan Kumar Himachal Pradesh Agriculture University, Palampur

Himachal Pradesh Krishi Vishvavidyalaya (renamed as Chaudhary Sarwan Kumar Himachal Pradesh Krishi Vishvavidyalaya in June, 2001) was established on 1st November, 1978.The College of Agriculture (established in May, 1966) formed the nucleus of the new farm University. It is ICAR accredited and ISO 9001:2015 certified institution. The Indian Council of Agricultural Research has ranked this University at eleventh place among all farm universities of the country. The University has been given the mandate for making provision for imparting education in agriculture and other allied branches of learning, furthering the advancement of learning and prosecution of research and undertaking extension of such sciences, especially to the rural people of Himachal Pradesh. Over the years, this University has contributed significantly in transforming the farm scenario of Himachal Pradesh. It has developed human resources, varieties and technologies and transferred these to farming community enabling the State to receive the “Krishikarman award” of Govt. of India four times in row for food grain production among small states of the country. Today, the State has earned its name for hill agricultural diversification and the farming community has imposed its faith in the University.

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Subject: Plant Pathology × Author: BHANDHARI, DIVYA × Start date: 2018 ×
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    ThesisItemOpen Access
    BIOLOGY OF Phytophthora colocasiae Raci. CAUSING BLIGHT OF COLOCASIA AND ITS ECO-FRIENDLY MANAGEMENT
    (CSHHPKV Palampur, 2020-10-01) BHANDHARI, DIVYA; Singh, Amar
    The investigation entitled “Biology of Phytophthora colocasiae Raci. causing blight of colocasia and its eco-friendly management” was conducted at Department of Plant Pathology, CSKHPKV Palampur during 2018-2020. Twenty isolates of colocasia blight pathogen (Phytophthora colocasiae) were isolated from the disease samples collected from five districts of Himachal Pradesh and pathogenicity was proved. Among different media tested carrot agar was found to be the best medium for mycelial growth and sporulation of P. colocasiae. On the basis of morpho-cultural variability and pathogenic variability twenty isolates were categorised into six and five groups, respectively. Only four isolates formed chlamydospores and these were formed abundantly under dark condition at pH 6.0 in carrot broth incubated at 18°C. Out of twenty isolates 18 were of A1 mating type whereas, 2 were of mating type A2. Nine isolates of Trichoderma spp. isolated from colocasia rhizosphere and and six unidentified bacteria isolated from colocasia phylloplane along with five standard isolates of Trichoderma spp. and Pseudomonas fluorescens were evaluated for their antagonistic activity in-vitro against P. colocasiae. Trichoderma sp.-6 was found significantly superior bioagent as it resulted in 72.9 per cent mycelial growth inhibition of P. colocasiae followed by Trichoderma sp.-5 (63.2%), Trichoderma sp.-4 (60.1%) and Trichoderma sp.-1 (54.5%) and Pseudomonas fluorescens (50.5%). Six bioagent isolates namely Trichoderma sp.-6, Trichoderma sp.-5, Trichoderma sp.-4, Trichoderma sp.-1, T. viride and P. fluorescens found effective under in-vitro were evaluated in-vivo by using three delivery systems under net house conditions. Trichoderma sp.-6 as corm treatment and drenching was found superior in managing colocasia blight than other bioagents while Trichoderma sp.-5 was found best as soil application. Among botanicals, Lantana ark at 15 per cent concentration was most effective resulting in 72.3 per cent mycelial growth inhibition of P. colocasiae under in-vitro conditions. Lantana ark was also found to be most superior in managing disease with 65 per cent disease control in leaf bioassays.