Sharma, MonicaThakur, Disha2023-12-212023-12-212023-11-17https://krishikosh.egranth.ac.in/handle/1/5810204126The fungal pathogen causing the Sclerotinia rot of carrots was isolated and identified as Sclerotinia sclerotiorum (Lib.) de Bary based on cultural and morphological characteristics. In the pathogenicity test, 7 days incubation period of on carrot roots was observed by placing a 5mm disc of mycelium over the holes made by a needle and covering it with damp cotton. Among ethanol biopesticides, all six ethanol biopesticides had certain inhibiting effects against the mycelia growth of S. Sclerotiorum.E.globulus and O.sanctum + O. Tenuiflorum ethnol biopesticides were shown to be the most efficient, with maximum inhibition in mycelia growth rates of 56.28 and 52.51 percent, respectively. In vitro, testing of methanol biopesticides of plant origin found that A. Indica had the highest mycelia inhibition of 83.31 percent of the 6 biopesticides tested against Sclerotinia sclerotiorum, M. Koenigii inhibited the pathogen’s mycelial growth the most (82.65%) whereas C. Sativa inhibited mycelia the least (40.74%). E. Globulus and C. sativa chloroform biopesticides were shown to be the most efficient, with maximum inhibition in mycelia growth rates of 78.52 and 77.53 per cent respectively. Under disease management startagies through effective biopesticides of plant origin for management of Sclerotinia rot, the root sprays of both methanol biopesticides of A. Indica, and acetone biopesticide of M. Koenigii, at 4 percent concentration were determined to be most effective, with the lowest disease indexes mycelia growth the most at 68.67% followed, by A.flavus at 65.30per cent, T.viride (58.22%), P. Flourescens (39.44%) and B.Subtilis (31.67%) were the next best in order. T.harzianum was shown to be the most effective root spray of biocontrol agents for the management of carrot sclerotinia rot, with a minimal disease index of 13.29 percent compared to 80.02 percent in control and lesion size of cm after 21st day after inoculation compared to 7.38cm of inoculated control.EnglishThesis