EVALUATION OF SOME CHEMICAL AND BOTANICAL MANAGEMENT PRACTICES IN CONTROLLING MAJOR INSECT PESTS OF SOYBEAN

Abstract

The experiment was conducted at the experimental field of Sher-e-Bangla Agricultural University, Dhaka during the Kharif season from April, 2012 to August, 2012 to study on evaluation of some chemical and botanical management practices in controlling major insect pests of soybean. The experiment comprised with six different insecticides and botanicals including control treatment viz. T1: Neem oil @ 3ml/L of water mixed with trix@10ml/L of water at 15 days interval, T2: Ripcord 10EC @ 2ml/L of water, T3: Aktara 25 WG @ 0.3 mg/L of water, T4: Sumialfa 5EC @ 2ml/L of water, T5: Marshal 20EC@ 2ml/L of water, T6: Control treatment; were used as treatments. Incidence of major pest of soybean var. Shohag was the main purpose of this study and their control with applied some chemicals pesticides as treatments. The experiment was laid out in Randomized Complete Block Design (RCBD) single factor with three replications. Among the major pests of soybean, maximum number of Whitefly, jassid, pod borer and leaf roller were effective than other pests on soybean research field. However, Sumialfa 5EC @ 2ml/L of water was supplementary efficient as well as the more reduction of major pests were recorded at different days after sowing. The maximum numbers of leaves, number of branches, maximum leaf length, number of flowers, minimum number of infested pod, maximum number of healthy pod per plant, were found from the treatment Sumialfa 5EC @ 2ml/L of water. Similar treatment also produced the yield plot-1 (3.29 kg) and yield per hectare (3.65 t/ha) of soybean. The highest benefit cost ratio (6.00) was obtained in Sumialfa 5EC @ 2ml/L of water the treated plot. Those results indicate that the Sumialfa 5EC @ 2ml/L of water showed the best performance to manage the major pests of soybean as well as on growth and yield among the all applied insecticide in this study. I also found the lady bird beetle as predator from my experimental field.