EFFECT OF SOME PROMISING CHEMICALS AND BOTANICALS ON THE MANAGEMENT OF APHID AND TOBACCO CUTWORM IN MUSTARD

Abstract

The experiment was conducted at Sher-e-Bangla Agricultural University, Dhaka, Bangladesh to study the effect of some promising chemicals and botanicals on the management of aphid and tobacco cutworm in mustardin mustard during the period from October 2021 to February 2022 in the Rabi season. The experiment was laid out in Randomized Complete Block Design (RCBD) with five different treatment viz: T 1 : Confidor 70WG (imidacloprid) @3g/kg of seed, T 2 : Bioneemplus 1EC (azadirachtin) @1.0 ml/L of water, T 3 : Neem seed kernel extract (azadirachtin) @50 g/L of water, T 4 : Tracer 45 SC (spinosad) @0.4 ml/L of water and T 5 : untreated control, for the management of aphid and tobacco cutworm of mustard with three replications for each treatment. Data on different parameters were recorded and significant variation was observed among different treatment. Experimental result showed that at early, mid and late stage of flowering and fruiting the highest number of aphid and cutworm was observed in T 5 treatment while the lowest number of aphid and cutworm was observed in T 4 treatment. In case of aphid at flowering fruiting stage the maximum number of healthy plant m -2 (28 and 24.67) and higher infestation reduction percentage (76.92 and 72.78 %) was observed in T 4 treatment. In the case of tobacco cutworm at the flowering and fruiting stages, the highest number of healthy plants per square meter (29.33 and 28.00) and the highest infestation reduction percentage (87.64and 76.92 %) was found in the T 4

treatment. In case of growth, yield contributing characters and yield of mustard, among different treatments the maximum plant height (106.35 cm), number branches plant

(16.02), siliqua plant -1 (105.10), siliqua length (4.14 cm), seeds siliqua (26.87), 1000seed weight

(4.02 g) and higher seed yield (1.77 t ha -1 -1 ) was obtained from T 4 treatment which gave (84.38 %) more yield comparable to control treatment. Based on the investigation of the above results, it may be concluded that among seed treating chemical and few botanicals for controlling mustard aphid and tobacco cutworm, spraying Tracer 45 SC @0.4 ml/L of water at 10-day intervals was the most effective among the management practices for controlling mustard aphid and tobacco cutworm.