Rana, V KKashyap, Hemant Kumar2023-06-242023-06-242022-12-04https://krishikosh.egranth.ac.in/handle/1/5810197700The present investigation entitled “Biology and eco-friendly management of cabbage butterfly Pieris brassicae L.” was carried out in the Department of Entomology, College of Horticulture and Forestry, Neri, Hamirpur (HP). Studies on the biology revealed that pre-oviposition, oviposition and post-oviposition periods were 1.60, 3.60 and 1.8 days, respectively. A single female butterfly laid 128.60 ± 9.50 eggs, which hatched in 5.50 ± 0.02 days. Mean duration of the 1st, 2nd, 3rd, 4th and 5th larval instars was 4.70, 4.50, 4.30, 4.80 and 5.50 days, respectively with a total larval period of 23.50 days. The pre-pupal and pupal stage lasted for 1.50 ± 0.02 and 10.50 ± 0.02 days, respectively. The male and female completed total life cycle in 40.00 ± 0.44 and 42.40 ± 0.68 days. Morphometric study revealed that the egg measured 1.08 ± 0.01 mm in diameter. Average body length of the 1st, 2nd, 3rd, 4th and 5th larval instars was 6.01 ± 0.02, 11.88 ± 0.12, 21.64 ± 0.32, 31.09 ± 0.48 and 38.29 ± 0.18 mm, respectively. All the pesticides tested viz., spinosad 45% SC, emamectin benzoate 5 SG, Azardirachtin 0.15% EC, Bacillus thuringiensis var. Kurstaki 0.5 WP, Beauveria bassiana 1 WP and Agni astra for the management of P. brassicae were found to be superior over control. Among the different pesticides tested spinosad 45% SC @ 0.004% was found to the be most effective for managing population of P. brassicae, while Agni Astra was the least effective.EnglishThesis