Vol. 11, Special Issue 5 (2022)

Author(s):
Anand Kumar Ojha, SPS Tomar, Naveen, Neeraj Kumar, Shivani Suman and Sakshi Saxena

Abstract:
The present investigation was carried out at Research Farm, RVSKVV, Gwalior during the Kharif season of 2019. The green gram crop was sown with Sikha variety by following recommended agronomic practices and fertilizer application, except pest control measures. The results revealed that five insect species were observed infesting mung bean crops on the Sikha variety at various phases of crop growth. Sap feeders such as whitefly (Bemisia tabaci Gennadius), aphid (Aphis craccivora Koch), jassid (Empoasca kerri Walsh), thrips (Thrips tabaci Lindeman), and bean pod borer (Maruca vitrata Fabricius) were found in Gwalior, Madhya Pradesh. The activity of B. tabaci, A. craccivora, and E. kerri was recorded from 32^nd SMW, during the vegetative stage and persisted until crop maturity, i.e., the 38^th SMW. The B. tabaci population gradually rose to the 34^th SMW (7.40 whiteflies/plant) with its peak in 36^th SMW, with an average of 12.40 whiteflies/plant, and then steadily fell. The A. craccivora population gradually rose to the 34^th SMW (5.40 aphids/plant) and 36^th SMW had the highest population, with an average of 8.70 aphids/plant. Furthermore, the E. kerri infestation significantly decreased up to the 34^th SMW (2.50 jassid/plant) and 35^th SMW had the highest population, with an average of 7.50 jassid/plant. T. tabaci activity, on the other hand, was seen during the 33^rd SMW, at the vegetative stage and lasted until crop maturity, i.e., the 38^th SMW. The largest population, however, was seen during 35^th SMW), with an average of 7.00 thrips/plant. Furthermore, M. vitrata activity was noticed from 34^th SMW, at the reproductive stage and persisted until crop maturity, i.e., in 38^th SMW; nevertheless, the largest population was found in 36^th SMW with an average of 2.30 larvae/plant. The populations of B. tabaci and T. tabaci had a significant positive correlation with maximum temperature (r= 0.75 and r= 0.77), respectively. E. kerri and T. tabaci populations revealed a significant positive correlation with minimum temperature (r= 0.78) and (r= 0.76), respectively. Rainfall had a significant negative correlation with the population of E. kerri (r=-0.78).