Abstract: The oviposition preference of female of rice and water oat population of rice stem borer was studied in the oviposition cage (1m?1m?0.8m) in laboratory. The results showed that there was no significant difference between the numbers and distributions of eggs laid by the two populations, but each population preferred to lay its non hatching ovum on the non host plant.The host selection behavior of larvae of two host populations was also investigated by Ytube olfactory. When the leaf or leaf shell of rice and water oat was provided to larvae of rice population in choice test, 4th and 6th instar larvae of rice population preferred rice leaf to water oat leaf and 2nd and 4th instar larvae preferred leaf shell of rice to leaf shell of water oat. When leaves of rice and water oat were provided to larvae of water oat population in choice test, except for 1st instar, each stadium of larvae preferred water oat leaf to rice leaf, and when leaf shells of rice and water oat were provided, all stadiums of larvae preferred leaf shell of water oat to leaf shell of rice. These results demonstrated that intraspecies differentiation between the two populations,and the specialization of water oat population of rice stem borer to host was higher than that of rice population.

Key words: Chilo suppressulis, Rice, Water oat, Oviposition, Host selection behavior, city, sustainable development, synergy, management optimization, energy-water-food-land-climate change nexus, conflict.