Abstract:

The suppressing effect of water traps baited with a 41∶5∶4 blend of Z11-16:Ald, Z13-18:Ald and Z9-16:Ald for mass trapping of the stripped stem borer (SSB)，Chilo suppressalis (Walker) was evaluated in green rice production bases in Jilin Province of China in 2002 and 2003. The investigation showed that populations of the male SSB were reduced by 84.54% and 83.75% in 2002 and 2003 respectively, compared with the untreated control plots. The sex ratio (female∶male) of the SSB population in the trapping plots largely skewed to female. Also the female mating percentage and the density of the egg masses in the trapping plots was reduced significantly, compared with that of the control plots in both years. Correspondingly, the infestation levels of the withered leaf sheaths (WLS), dead heart (DH) and the white head (WH) plants destroyed by SSB larvae in 2002 and 2003 were notably reduced. The combined results indicate that mass trapping with the synthetic sex pheromone is a promising agent against SSB.

Key words: Rice pests, Chilo suppressalis, overwintering generation, sex pheromone, mass trapping