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The Research in: Agricultural & Veterinary Sciences is fully open access, strictly peer-reviewed publication which strongly encourages a multidisciplinary approach to research. The scope of the journal is intentionally broad and includes almost all of the key aspects of Agricultural science, veterinary science and veterinary medicine.

Journal Article

Journal article

EFFICACY OF CHITOSAN AND BIO-AGENT IN CONTROLLING SOUTHERN BLIGHT DISEASE OF CARROT CAUSED BY Sclerotium rolfsii AND IMPROVEMENT THE CROP PRODUCTION  [2019]

Ahmed, Main Uddin; Bhuiyan, M K A; Hossain, M M; Rubayet, M Tanbir; et al.

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An experiment was conducted for management of southern blight disease of carrot caused by Sclerotium rolfsii isolate BS-5 using chitosan and Trichoderma harzianum isolate PB-7 spore suspension by means of seed treatment and foliar spray. Before setting experiments in the field, a series of preliminary laboratory trials were carried out to select a virulent isolate of S. rolfsii (BS-5) by pathogenicity test, an effective antagonist isolate of Trichoderma harzianum (PB-7) by screening against S. rolfsii isolate BS-5 and a suitable concentration of chitosan (600 ppm) by the radial growth test against S. rolfsii isolate BS-5. Seed treatment and foliar spray with T. harzianum isolate PB-7 spore suspension (5105 spores ml-1) and chitosan 600 ppm was applied both and/or individual according to the design of the experiment. Significantly, the highest 90.91% reduction of post-emergence seedling mortality was recorded with treatment T6. Similarly, the highest 81.41% reduction of the southern blight incidence and Percent Disease Index (PDI) 81.97% was observed in the treatment T6 followed by the treatments T7, T8 and T9, respectively. All the treatments significantly reduced the disease incidence and increased the yield compared to the untreated control treatment T1. The highest yield 22.60 t ha-1 with the maximum increasing of yield 53.33% was observed in T6 over control treatment T1 followed by the treatments T7, T8 and T9, respectively. Seed treatment was found m
ore effective than foliar spray in case of individual or integrated application of chitosan and T. harzianum spore suspension for the protection of southern blight disease and also increases the yield of carrot.

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Research in: Agricultural & Veterinary Sciences

ISSN : 2520-6516