Population dynamics of Jassid Amrasca biguttula biguttula (Ishida) infesting okra and its relationship with weather parameters

Abstract

An investigation to study the population dynamics of jassid (nymph/leaf), Amrasca biguttula biguttula (Ishida) (Cicadellidae) infesting okra and its relationship with weather parameters was carried out at Anand Agricultural University, Anand, Gujarat during summer 2021. The incidence of jassid commenced after two weeks of germination (10th SMW) and continued up to removal of crop in the 20th SMW. A higher incidence of jassid was observed during the 13th to 17th SMW. Jassid population exhibited significant positive correlation with maximum temperature and vapour pressure deficit, whereas it showed non-significant positive correlation with minimum temperature, bright sunshine hours, morning and evening vapour pressure. The morning as well as evening relative humidity, rainfall and wind speed showed non-significant negative correlation with jassid population. Population of coccinellids had significant positive correlation whereas spider population had highly significant positive correlation with jassid population.