Seasonal Incidence of Citrus Trunk Borer (Anoplophora versteegi Ritsema) on Khasi Mandarin in Arunachal Pradesh

The adults of citrus trunk borer first appeared in the third week March to second week of April. Female beetles appeared earlier than male. The beetle population reached the peak on first to third week of May, after which the population declined and completely disappeared from the orchard from the fourth week of July to second week of August. The number of female beetles was found to be outnumbered the male sex during this population growth phase and the number of male beetles /plant was found to be more than females during population declining phase. Adult beetle population of citrus trunk borer was negatively correlated with minimum temperature and positively correlated with bright sunshine hours and wind speed. The studies further showed that gradual rise in winter minimum temperature increased the beetle population and further rise in summer minimum temperature declined the beetle population