Effect of mustard varieties on life table and development of diamondback moth, Plutella xylostella

The Life table and development of diamondback moth, Plutella xylostella, was studies on four mustard varieties, Brassica napus var. Neelam, B. campestris var. Pusa Kalyani, B. campestris var. BSH-1, B. juncea var. Pusa Bold in protected field conditions for two consecutive year 2004 and 2005. Mortality of immature stages was higher on Indian mustard during both cropping years than to other varieties. Maximum number of eggs laid by P. xylostella was on cauliflower and minimum on B. campestris BSH-1 in both cropping years of 2004-05 and 2005-06. Net reproductive rate (R0) was smallest i.e. 8.36 and 10.36 females/female/generation on B. campestris var. BSH-1 in both cropping years. Intrinsic rate of increase (rm) was smallest on B. campestris var. BSH-1 > Indian mustard > Pusa kalyani > Neelam > cauliflower. Generation time was prolonged on India mustard and BSH-1, therefore, egg, larval and pupal stages are more exposed to parasites than shorter generation. Doubling time is prolonged on Indian mustard and BSH-1. Development of immature stages was fast on cauliflower and prolonged to 38.1 days on B. campestris var. BSH-1. Greater degree days (DD) were required to complete immature development on BSH-1 and on B. juncea than Pusa Kalyani and Neelam. Similarly pupal development required more degree-days than other immature stage.

Author(s): Tufail Ahmad and M. Shafiq Ansari

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