SCREENING OF BRASSICA GERMPLASM AGAINST MUSTARD APHID, LIPAPHIS ERYSIMI KALT.

The field experiments on "Screening of Brassica germplasm against mustard aphid, Lipaphis erysimi Kalt." were conducted at Students' Instructional Farm of C. S. Azad University of Agriculture & Technology, Kanpur, India during Rabi 2021-22 and 2022-23. Fifty Brassica germplasm were evaluated on the basis of the Aphid Infestation Index (A.I.I.) (0-5 scale) twice, first at 50% flowering stage and second at the pod setting stage. The population of mustard aphids was observed in 50 germplasm taken under screening to see the performance of germplasm based on the level of infestation of mustard aphids. Based on A.I.I. the germplasm viz., RC-2, RC-4, RC-6, RC-14, RC-19, RC-20, RC-22, RC-24, RC-25, RC-37, RC-39, RC-46 and RC-49 were found to be resistant; while the germplasm viz., RC-8, RC10, RC-12, RC-15, RC-16, RC-18, RC-21, RC-35, RC-38, RC-41, RC-42, RC-44, and RC-48 were found to be moderately resistant. Based on the aphid population, the germplasm viz., RC-5, RC-20, RC-23 and RC-37 were categorized as resistant; the germplasm viz., RC-2, RC-9, RC-13, RC-14, RC-22, RC-25, RC-29, RC-35, RC-40, RC-42, RC-44, RC-45, RC-46, RC-47, RC-49 and RC-50 were found to be moderately resistant, while RC-24 was found to be susceptible. [ABSTRACT FROM AUTHOR]