Vol. 11, Special Issue 6 (2022)

Author(s):
Aditya Patel, Hem Singh, Gaje Singh, DV Singh and Ramesh Singh

Abstract:
Investigation on seasonal incidence of sucking pest of okra and its relationship with weather parameters was carried out at Crop Research Centre (CRC) of Sardar Vallabhbhai Patel University of Agriculture & Technology, Meerut, Zaid 2021 and 2022. The incidence of leafhopper, Amrasca biguttula biguttula (Ishida), aphid, Aphis gossypii (Genn.) and whitefly, Bemisia tabaci (Genn.) were observed on okra crop during two consecutive seasons. The data revealed that the population of leafhopper, aphid and whitefly were started 12-14 days after sowing in both season. The infestation of leafhopper, aphid and whitefly reached to its peak period in the 17^th SMW i.e.19.00 leafhopper/3 leaves, 16.20 aphid/3 leaves and 17.00/ 3 leaves during Zaid, 2021. The highest infestation of leafhopper, aphid and whitefly were recorded on 17^th SMW (20.60 leafhopper/ 3leaves), 16^th SMW (14.80 aphid/3 leaves) and 16^th SMW (14.40 whitefly/3 leaves), respectively during Zaid, 2022. There was positive correlation between pest populations with maximum temperature (leafhopper r= 0.752 and r=0.761, aphid r= 0.747 and r=0.691, whitefly r= 0.738, r=0.661) and only relative humidity was negatively correlated (leafhopper r= -0.825 and r= -0.844, aphid r= -0.720 and r= -0.749, whitefly r= -0.752, r= -0.724) in both season. The population of leafhopper was correlated positively non-significant while aphid and whitefly population were correlated significantly positive during Zaid, 2021 and vice versa in Zaid, 2022. The data revealed that the correlation between total rainfall and leafhopper population was negatively non-significant (r= -0.091 and r= -0.245) and aphid was positively non-significant (r=0.047 and r= 0.362) in both year while whitefly was correlated positively non-significant (r=0.022) and negatively non-significant (r= -0.357) in Zaid, 2021 and 2022, respectively.