Abstract: Rice variety could influence the development, survival and fecundity of the parasitoid Anagrus nilaparvatae directly through the physical structure of the plant or indirectly through the eggs of the parasitoid's host, I.e. the brown planthopper,Nilaparvata lugens (Stal). There was a highly significant negative correlation between the emergence rate and fecundity of the parasitoid and the silicious cell density on the back of leaf sheath of rice, and the fecundity andbody size were very significantly positively correlated with the egg size of N. lugens which was influenced by rice variety. The component analysis of the index of capacity for population increase of the parasitoid showed that the main factors affectingthe capacity for population increase of the parasitoid were different fimong rice vaileties. This implies that the effects of rice varieties on the parasitoid are resultedfrom multi- factors.

Key words: rice varieties, Nilaparvata lugens (Stal), Anagrus nilaparvatae, capacity for population increase.