A field experiment was carried out to study the incidence of major lepidopteran insect pests of the black gram on different dates of sowing at B A College of Agriculture, Anand Agricultural University, Anand, with five different sowing dates at an interval of seven days. The result showed that there was a significant impact of sowing periods on insect pests activity in black gram. The incidence of defoliators viz., Bihar hairy caterpillar, Spilosoma obliqua Walker and Spotted pod borer, Maruca

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... estulalis (Geyer) was higher in the late sowing periods i.e., 1 st week of August and 2 nd week of August. These sowing periods also yielded higher. The prevalence of defoliators was comparatively low in 2 nd week of July, 3 rd week of July, and 4 th week of July sown crop.