Abstract
Grading scale for the ovarian development of rice water weevil (RWW), Lissorhoptrus oryzophilus Kuschel, was presented in the light of the practices for pest forecast in China and the operationability in grass roots extension station. According to the morphological changes in ovarian development, their anatomical criteria were classified into six grades, i.e. 0, no oocyte; Ⅰ, previtellogenic; Ⅱ, gravid (vitellogenic to chorionated eggs); Ⅲ, ovipositing (a number of chorionated eggs are stored in the egg calyxes); Ⅳ, late egg laying (the early and middle degeneration); Ⅴ, postoviposition senescence (the late degeneration). These criteria were applied to characterize the field population of RWW and to appraise the suppression effect of some insecticides (say Imidacloprid) that cause the ovarian development retardation and egg laying dysfunction.
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