MANAGEMENT OF MULBERRY THRIPS USING NEWER INSECTICIDES AND BIORATIONALS AND ITS EFFECT ON SILKWORM REARING PERFORMANCE

摘要

The efficacy of newer insecticides and biorationals against mulberry thrips revealed that spraying of acetamiprid MSP@ 0.25 g/1, profenophos 50 EC @ 2 ml/1, spinosad 45 EC @ 0.25 ml/I and fipronil 5 SC @ 1 ml/1 effectively controlled dirips upto fivedays of spraying. While, buprofezin 25 SC @ 0.2 ml/1, diafenthiuron 50 WP @ 0.75g/l, DDVP 76 EC @ 1 ml/I, ramiwash @ 5 per cent. Fish oil rosin soap (FORS) @ 2 ml/l and Lecanicillium lecanii@ 2 g/I significantly reduced the thrips [fopulation upto five days of spraying over water spray and untreated treatment. Silkworm growth and cocoon traits influenced by feeding mulberry sprayed with'insecticides and biorationals recorded shorter larval duration when fed on buprofezin (610.67 lr)sprayed leaves. The mature larval weight was statistically high in leaves sprayed with vermiwash @ 5% (37.22 g/10 larvae) ind buprofezin (36.68 g/10 larvae). The effective rate of rearing was high in fipronil (97%), vermiwash @5% (96.00%) and fdhfenthiuron (97.00%). The highest pupal weight was obtained by feeding diafenthiuron (15.57 g /10 pupae), vermiwash @ 5%(15.24g/10 pupae), DDVP (15.04 g/10 pupae) and buprofezin (14.95 g/10 pupae) sprayed leaves. Maximum cocoon weight (19.11 g) was recorded in diafenthiuron, while the cocoon shell weight was more in vermiwash @ 5% (3i41 g/10 shell) and diafenthiuron (3.30 g /10 shell). The longest cocoon filament was recorded by rearing silkworm sprayed with diafenthiuron (879.59 m). The cocoon yield (734.18 g/dfl) and benefit costratio (2.0) was significantly highest in silkworm reared from fipronil sprayed leaves.