Diversity and Abundance of Chrysomelids Associated with Rice under Natural Farming in mid Hill Conditions of Himachal Pradesh

Abstract

The study on diversity and abundance of chrysomelids associated with rice was conducted in mid-hill regions of Himachal Pradesh during kharif 2022 and 2023, identified eight chrysomelid species, their abundance and diversity using various indices under natural farming. Diversity of chrysomelid fauna was found higher at Palampur region with all the eight species recorded during the crop growth period as compared to Jogindernagar, where only five species were found associated with rice ecosystem during both the cropping years. Among these identified species, Chaetocnema gracilis and C. nigrica were found to be predominant in both the locations surveyed. Findings revealed seasonal variations in chrysomelid abundance, with peak population in the month of July and August, emphasizing critical periods for pest management interventions. Correlation analysis indicates intriguing patterns, such as positive influences of rainfall on certain pest species and varying correlations with maximum temperature. This study contributes essential insights into chrysomelid beetles under natural farming conditions in Himachal Pradesh and their relation to the abiotic factors prevailing in particular area.