Abstract: A laboratory experiment is conducted to study the effect of morphological characters.of rice varieties on distribution of Nilaparvata lugens eggs on rice plants and the functional response of Anagrus nilaparvatae to it.The results show that for all rice varieties tested,the vertical distribution of N.lugens eggs on the plants could be divided into three types:mainly on the upper and middle parts of rice plant,mainly on the middle and lower parts of rice plant,and uniform distribution. The number of N.lugens eggs on the upper,rniddle and lower parts of rice plant is very significantly positively correlated with the relative height of leaf sheath back at the corresponding parts of rice plant.The functional response of the parasitoid to N. lugens eggs mainly distributed on the upper and middle parts of rice plant ZND40 is obviously stronger than that mainly distributed on the middle and lower parts of rice plant Z852.

Key words: Rice varieties, Nilaparvata lugens, Anagrus nilaparvatae, Functional response, diversity, arbuscular mycorrhizal fungi (AMF), dominant species, species distribution, spore