EVALUATION OF THE REPELLENT EFFECTS OF DIFFERENT BOTANICAL EXTRACTS ON TOMATO INSECTS

Abstract

The experiment was conducted in the experimental field of Sher-e-Bangla Agricultural University, Dhaka. Bangladesh during the period from October, 2016 to March 2017 for the evaluation of the repellent effects of different botanical extracts on tomato insects.BARI tomato 15 was used as test crop. There were 7 treatment vi:. i) Neem leaf extract @ 0.5 kg U' of water at 5 days interval, ii) Neem leaf extract @ 0.5 kg U' of water at ID days interval, iii) Neem oil @3.0 ml U' of water at 5 days interval. iv) Neem oil @3.0 ml Ul of water at 10 days interval, v) Garlic extract Ø 0.5 kg L of water at 5 days interval, vi) Garlic extract @ 0.5 kg U' of water at tO days interval and vii) control (no repellant)was used for the experiment. The present study showed signilicant effect to control insects effectively. The lowest incidence of whitefly.jassid. aphid and leaf miners plani' (16.31. 1.60, 16.70 and 3.12 respectively) presence by number were found more effective with (Neem oil @3.0 ml U' of water at 5 days interval) where control treatment gave the highest incidence (35.44. 4.10. 30.67 and 5.62 respectively). Treatment of 13 (Neem oil (t 3.0 ml U' of water at 5 days interval) also showed highest percent reduction whitefly, jassid. aphid and leaf miners plani' over control (53.98. 60.98. 46.55 and 44.48% respectively). The highest plant height (105.66 cm), number of branches plani' (7.44), number of healthy fruits planr' (37.41), weight of healthy fruits planf' (1516.29 g). healthy fruit yield hi' (60.65 0 and total fruit yield hi' (65.55 t) also achieved by Neem oil @ 3.0 ml U' of water at 5 days interval) where control treatment gave the lowest performance with these parameters. Neem leaf extract @0.5 kg U' of water at 5 days interval and Garlic extract @ 0.5 kg U' of water at 5 days interval treatment also gave better performance in respect to control treatment. In terms of ceo-friendly management. it was found that botanical antimierobials derived from plants are currently recotized as biodegradable. systemic. ceo-friendly and non-toxic to mammals and are thus considered safe. Botanical products are environmentally safe, less hazardous. economic and easily available.