Vol. 12, Issue 3 (2023)

Author(s):
Chetna Khandekar, Dr. YK Yadu and Roshani Pisda

Abstract:
The experiment was conducted in the College of Agriculture, Indira Gandhi Krishi Vishwavidyalaya, Raipur (C.G.) during Kharif 2018–19. The population dynamics of insect pests and natural enemies of soybean were recorded in the variety JS-97-52. Throughout the study, seven species of insect pests were recorded viz., stem fly (Melanagromyza sojae), girdle beetle (Obereopsis brevis), tobacco caterpillar (Spodoptera litura Fabricius), green semilooper (Chrysodeixis acuta Walker), white fly (Bemisia tabaci Gennadius), jassids (Apheliona maculosa) and thrips (Thrips), among the natural enemies, the predatory pentatomid bug (Eocanthecona furcellata) and the spider (Oxyopes sp.) and (Neoscona sp.) were recorded. The observations were recorded at weekly intervals during the morning hours without disturbing the pest fauna. Insect pests were observed from the third week of July to the last week of September. Results indicated that, the peak incidence of C. acuta and S.litura was achieved during the first week of September (35^th SMW) with the mean of 1.5 and 1.4 larvae/mrl. The peak density of whitefly was observed in the last week of August (34^th SMW) while, the peak density of thrips and jassids was observed during the second week of August (32^nd SMW). The occurrence of predatory bugs started in the second week of August (32^nd SMW), which was the peak period with a mean of 0.7, while the peak density of spiders was noticed in the first week of September (34^th SMW) with a 2.0 mean.