Vol. 11, Issue 9 (2022)

Author(s):
Hemlata, Dr. YK Yadu, Aalok Kumar and Suryakant Rohit

Abstract:
The field experiments were conducted at Research Cum Instructional Farm at IGKV, Raipur (C.G.) during kharif 2018, to know the seasonal incidence of soybean insect pests and their natural enemies. Soybean is an oilseed crop of family Fabaceae. It is grown for its various purposes. During the studies observations are taken in the plot of 50 m2 and recorded the five species of insect pests which attacked on the soybean crop at different growth stages. The insects are tobacco caterpillar, green semilooper, whitefly, thrips and jassids. Among the natural enemies lady bird beetle, Coccinellidae septumpunctata; spiders – Oxyopes and Neoscona species., and a pentatomid bug- Eocanthecona furcellata found preying on them. Observations were recorded on seasonal occurrence of insect pests of soybean and peak activity were recorded at the different Standard Meteorological week. The insect pests are correlated with different weather parameter viz., minimum and maximum temperature, rainfall, relative humidity (morning and evening). The correlation of insect pests is non significant to all weather parameters but jassids showed significant and negative correlation with minimum temperature (r= -0.64*). The natural enemies was found positively correlated with the sucking pests and number of defoliators (S.litura and C.acuta) in kharif, 2018. Coccinellid beetle showed significant and positive correlation with whitefly (r= 0.61 *), thrips (r= 0.64*) and jassids (r= 0.64*). Spider showed significant and positive correlation with tobacco caterpillar (r= 0.79*), green semilooper (r= 0.72 *), whitefly (r= 0.61 *), thrips (r= 0.69*) and jassids (r= 0.80*). Whereas, predatory bug showed significant and positive correlation with tobacco caterpillar (r= 0.85*) and green semilooper (r= 0.91*).