Population dynamics of major insect pests in different mustard varieties and correlation with weather parameters

AbstractThe study on population dynamics of key insect pests in mustard (Brassica juncea) varieties revealed leaf webber infestation was first observed in early December, peak in mid-January, with a positive correlation with maximum temperature, sunshine hours and a negative correlation with humidity. Sawfly emerged in December, attained peak soon after, showing a negative correlation with temperature and positively with humidity. Painted bug infestations appeared in December, with peak in January, and correlated positively with maximum temperature, negatively with humidity. Aphid populations noticed steadily from January, peak in early February, positively associated with maximum temperature but negatively impacted by high humidity. Flea beetle populations peak in January, showing a non-significant positive correlation with temperature, sunshine hours, negatively with humidity. Coccinellids, first observed in December, peak in late January, and exhibited a positive correlation with temperature and sunshine hours, highlighting their potential role in natural pest suppression. These findings underscore the strong influence of weather parameters on pest population dynamics, with temperature and sunshine favoring pest activity, while humidity generally inhibited it.