Vol. 11, Special Issue 7 (2022)

Author(s):
Sheojat, NKS Bhadauria, Neeraj Kumar, Naveen, Amar Chand and Shivani Suman

Abstract:
The present investigation was carried out at the entomological field of College of Agriculture, Gwalior, M.P. during rabi 2019. The results revealed that about six species of insect pests were observed at different phases of the brinjal crop starting from germination to maturity. Jassid (Amrasca biguttula biguttula Ishida), aphids (Aphis gossypii Glover), whitefly (Bemisia tabaci Gennadius), mealy bug (Coccidohystrix insolita Green), shoot and fruit borer (Leucinodes orbonalis Guenee), and grasshoppers, (Melanoplus differentialis Thomas) were observed to infest the crop. Brinjal shoot and fruit borer (L. orbonalis) was identified as an important pest among them. A. biguttula biguttula population started increasing from 47^th SMW and reached its peak (4.46 jassid / 5 plant / plot) during 2^nd SMW. The population then decreases after 47^th SMW and stays up to the harvest of the crop. B. tabaci population started increasing sharply from 49^th SMW and reached its peak (3.56 whitefly / 5 plant/ plot) during 1^st SMW. The population then decline sharply up to 10^th SMW (0.00 whitefly) and disappeared afterward. L. orbonalis population started out increasing sharply from 50^th SMW and reached its peak (20.66%) during 2^nd SMW. Population then declines during 3^rd SMW and was available up to 17^th SMW. Correlation studies revealed that the population of all the three insect pests viz., A. biguttula biguttula, B. tabaci and L. orbonalis exhibited significantly positively correlation with evening relative humidity and maximum temperature and minimum temperature showed significantly negative correlation.