COMPARATIVE EFFICACY OF SOME CHEMICAL INSECTICIDES AND BOTANICALS AGAINST CHILLI FRUIT BORER (Helicoverpa armigera)

Abstract

The study was carried out in the experimental field of Shcr-e-Bangla Agricultural University, Dhaka, Bangladesh during the period from February to June 2007 to determine of the comparative efficacy of some chemical insecticides and botanicals against chilli fruit borer. The experiment comprised with twelve treatments and among them first six (T1 ]'6) were the application of insecticide and others (17-'l'l i) were botanicals. Treatments were 1,: Sumicidin @6.0 ml/2 litre of water at 7 days interval; T2: Malathion @6.0 ml/2 litre of water at 7 days interval; T3: Ripcord @3.0 ml/2 litre of water at 7 days interval; 14: Marshal @6.0 ml/2 litre of water at 7 days interval; T5: Diazinon @ 6.0 ml/2 litre of water at 7 days interval; l: Suntal@ 2.5 nil/2 litre of water at 7 days interval; '1'7: Allamanda leaf extract @0.5 kg/2 litre of water at 7 days interval; T8: Neem leaf extract @ 0.5 kg/2 litre of water at 7 days interval: T1: Garlic clove extract @ 0.5 kg/2 litre of water at 7 days interval; l j : Ginger rhizome extract @ 0.5 kg/2 litre of water at 7 days interval; T, i : Onion bulb extract @ 0.5 kg/2 litre of water at 7 days interval; 1,2: Untreated control. In total cropping season the lowest percentage of fruit infestation in number (5.72%) was recorded from the treatment 14 which was statistically similar (6.22%) with the treatment T8 and the highest (24.90%) was recorded from untreated control treatment which was closely followed (17.39%) by the treatment T5 and Ti (16.48%) and T10(15.37%). Fruit infestation reduction over control in number estimated as the highest value (77.03%) was recorded from the treatment 14, while the lowest (30.16%) was recorded from treatment. In the cropping season the lowest percentage of fruit infestation in weight (9.69%) was recorded from the treatment 14 which was statistically similar (10.03%) with the treatment Ig. On the other hand , the highest (26.44%) fruit infestation was recorded from untreated control treatment which was closely followed (20.40%) by the treatment Ti and i, (19.56%) and I,o(19.05%). Fruit infestation reduction over control in weight was estimated the highest value (63.35%) , recorded from the treatment 14, while the lowest (22.84%) reduction of fruit infestation over control was from T5 treatment. Highest weight of fruit yield (30.60 t/ha) was recorded from the treatment 14 and the lowest yield (24.48 1./ha) of fruit was recorded from untreated control treatment. Among different treatments as a whole botanicals (li-li i) were more effective than the chemicals insecticides (T,-T6).