Screening of capsularis and olitorius Jute germpalsms against major Insect Pests

The level of jute stem weevil infestation ranged from 0.3% (CIJ-30) to 4.3% (NDC-2005-6) at 20 DAS, 3.0% (CEX-17) to 10.3% (CIN-211) at 35 DAS and 4.6% (CIJ-42, CIN-01) to 10.6% (CIN-211) at 55 DAS. The semilooper infestation at 55 DAS varied from 1.3% to 13.6% among the test germplasms with least in CIN-153 and other germplasms with less infestation of semilooper being on par with CIN-153 were CIJ-42 (1.6%), CIJ-12 (5.3%), CIN-163 (8.3%), CIN-01 (9.3%) and CEX-17 (9.3%). Likewise, the relative mite infestation, Padma (19.66/cm²), NDC-2005-2 (23.33/cm²), CIN-22 (23.33/cm²), CIN-211 (23.33/cm²) and NDC-2005-5 (24.66/cm² on second unfolded leaf) were found to be relatively less susceptible with < 25 mites/cm². In general, capsularis germplasms were less susceptible to insect pests stem weevil infestation. Mechanism of resistance should be elucidated in less susceptible lines before using in resistance breeding programme.