ECOFRIENDLY MANAGEMENT OF Bemisia tabaci AND Helicoverpa armigera Hubner IN TOMATO

Abstract

An experiment was conducted in the experimental field of Sher-e-Bangla Agricultural University, Dhaka, Bangladesh during the period from October, 2014 to March, 2015 to evaluate some management practices applied against Bemisia tabaci and Helicoverpa armigera, two major insect pests of tomato. The treatments were T1 : Spraying of Neem leaf extract @ 3.0 ml/L of water at 7 days interval + supporting the tomato plants with bamboo stick (STPBS); T2 : Spraying of Neem oil @ 3.0 ml/L of water at 7 days interval + STPBS; T3 : Spraying of Neem seed kernel extract @ 3.0 ml/L of water at 7 days interval + STPBS; T4 : Spraying of Garlic extract @ 3.0 ml/L of water at 7 days interval + STPBS; T5 : Spraying of Thuza leaf extract @ 3.0 ml/L of water at 7 days interval + STPBS; T6 : Spraying of Sweet apple leaf extract @ 3.0 ml/L of water at 7 days interval + STPBS; T7 : Spraying of Admire 200 SL @ 1.0 ml/L of water at 7 days interval + STPBS; T8 : Spraying of Sevin 85WP @ 2.00gm/L of water at 7 days interval + STPBS; T9 : Untreated control without any support of the tomato plants. The highest number of whitefly (34.00) was found in T9 but the lowest (11.33) was found in T7 followed by T8 (12.33), T2 (13.67) and T3 (14.33). Considering the application of different treatments the highest TYLCV (11.91%, 33.33% and 50.00%) was found in T9 and the lowest TYLCV (9.523%, 14.29% and 19.05%) was found in T7 treatment at vegetative, flowering and reproductive stages, respectively. Considering the application of different treatments against tomato fruit borer during different fruiting stages of the cropping season, at early, mid and late fruiting stages, the highest fruit infestation (16.74%, 14.28% and 13.42%, respectively) and weight (14.59%, 12.63% and 12.04%, respectively) were recorded in T9 treatment while the lowest (2.27%, 2.89% and 2.96%, respectively) and weight (1.97%, 2.56% and 2.66%, respectively) were recorded in T7 treatment. Considering the different treatment effects on tomato fruit yield applied against whitefly and tomato fruit borer, the highest fruit yield both in number and weight are more or less similar in T7, T8 and T3. Conversely, lowest fruit yield both in number and weight was recorded in treatment T9.