Monitoring of Rice Yellow Stem Borer, Scirpophaga incertulas Walker Using Pheromone Traps and Thermal Summations.
Monitoring studies were carried out at Medchal during Khorifl 996 to Rabi 1997 on rice yellow stem borer (YSB), ScirpophagQ incertulas using natural blend (3:1) of (Z)-l 1-hexadecenal and (2)-9-hexadecenal. Three peak periods of moth activity during July, August and September in Kharif and two during January and March/April in Rabi were noticed. Late planted crop was affected more than early planted crop. It is evident from the temporal relationship between peak periods of pheromone trap catches and field infestation that peak dead heart and white ear infestation occurs 2 and 3 weeks after peak/sudden increase in moth captures, respectively.