EFFECT OF SOME SELECTED INSECTICIDES AND BOTANICALS AGAINST INSECT PESTS FOR YIELD AND SEED QUALITY OF TOMATO

Abstract

The present experiment was conducted to study the effect of some selected insecticides and botanicals against insect pests for yield and seed quality of tomato at the farm of Shcr-e-Bangla Agricultural University, Dhaka during the period from October 2019 to March 2020. The experiment consisted of 7 treatments viz,T 1 = Spinosad 45EC @ 0.4 ml/L of water, T 2 = Voliam flexi 300SC @ 0.5 ml/L of water, T 3 = Bioneemplus 1EC @ 0.5 ml/L of water, T 4 = Proclaim 5SG @ 1.0 g/L of water, T 5 = Mig 5EC @ 1.0 ml/L of water, T 6 = Admire 20SL @ 0.5 ml/L of water and Untreated control, applied at 7 days interval through out the cropping season. The experiment was laid out in Randomized Complete Block Design with three replications. Among different treatments, T 6 (Admire 20SL) showed the best performance on the incidence of whitefly, aphid and leaf miner plant and showed lowest number (2.97, 4.00 and 1.21, respectively) and gave 72.45%, 80.55% and 72.26% reduction of incidence over control, respectively and regarding borer infestation of tomato, this treatment also showed highest healthy fruit plant by number (25.87) and weight (1.72 kg) compared to untreated control which showed least performance. Treatment T 6 (Admire 20SL) also showed highest healthy fruit yield (86.18 t ha -1 ) and maximum 68.81% increase of healthy fruit yield over control while the lowest infested fruit yield (3.02 t ha ii -1 ) was obtained with this treatment which was followed by T 3 (Bioneemplus 1EC) whereas untreated control gave lowest healthy and the highest infested fruit yield (51.05 and 10.18 t ha -1 , respectively).The yield contributing parameters and seed yield of tomato, treatment T 6 (Admire 20SL) performed the highest plant height (94.29 cm), number of branches plant (11.25), number of flower clusters plant -1 (8.63), number of fruits cluster -1 (6.37), single fruit weight (66.64 g), seed weight fruit -1 (0.57 g), seed weight plant -1 (12.73 g) and seed yield (636.70 kg ha -1 ) whereas untreated control treatment showed poorest performance.In case of seed quality parameters, treatment T 3 (Bioneemplus 1EC) treated plot showed the highest seed germination (97.23%), root length (3.41 cm), shoot length (5.25 cm) and seed vigor index (842.70) followed by T 6 (Admire 20SL) whereas untreated control plot showed the lowest results (83.80%, 1.91 cm, 3.75 cm and 473.70, respectively). From the above result, it may be concluded that the treatment T 6 (Admire 20SL) showed the best performance in suppressing whitefly, aphid and leaf miner plant -1 which resulted higher healthy fruit yield and seed yield followed by T 3 -1 (Bioneemplus 1EC). In case of seed quality parameters, T 3

(Bioneemplus 1EC) showed best performance while T 6 (Admire 20SL) showed comparatively better performance.