INCIDENCE AND BIORATIONAL BASED MANAGEMENT OF INSECT PESTS OF STEM AMARANTH

Abstract

The experiment was conducted at the central farm of Sher-e-Bangla Agricultural University, Sher-e-Bangla Nagar, Dhaka, Bangladesh to evaluate the incidence and biorational based management of insect pests of stem amaranth during the period from January 2021 to April 2021. The experiment was laid out in Randomized Complete Block Design (RCBD) with four replications. Six treatments, viz. Treatment T 1 (Field sanitation + Spraying Bio-neem plus botanical insecticide @ 1.5 ml/L at the 7 days intervals); T 2

(Mechanical control + Canola oil@ 1.0 ml/L with 10ml liquid detergent at the 7 days intervals); T 3 (Yellow sticky board traps + Baking soda 1gm/L at the 7 days intervals); T 4

(Soap water + Neem oil @ 1.5 ml/L with 10ml liquid detergent at the alternate 7 days intervals); T 5 (Field sanitation + Spraying Spinosad M-45 @ 0.5 ml/L at the 7 days intervals) and T 7 (untreated control) were included in this study. In case of different treatments performance, T 5 (Field sanitation + Spraying Spinosad M-45 @ 0.5 ml/L at the 7 days intervals) showed the best results in terms of lower incidence of insect pests of stem amaranth, number of leaves per plants, number of plants per plot, plant height, yield per plot and total yield (ton/ha). In term of total number of plants per plot, the highest number of plants per plot (30.54) was recorded from T 5 treatment was closely similar with others treatment except untreated control respectively. In term of yield of total stem amaranth, the highest yield of total stem (36.92 t/ha) was observed in T 5 treatment which was closely similar with others treatment except untreated control. There was negative relationship present in incidence of insect pests of stem amaranth with the yield of stem amaranth, i.e. when the total yield (t/ha) was decreased due to increased insect pests of stem amaranth. From the study, it may be concluded that treatment T 5 (Field sanitation + Spraying Spinosad M-45 @ 0.5 ml/L at the 7 days intervals) as more effective of different treatment for the incidence and biorational based management on insect pests of stem amaranth which was followed by spraying of T 1 (Field sanitation + Spraying Bio-neem plus botanical insecticide @ 1.5 ml/L at the 7 days intervals).