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Fecundity and egg size were compared in adult of the females adult diamondback moth, Plutella xylostella (Lepidoptera: Yponomeutidae) treated and untreated with sublethal doses of fenvalerate in order to understand the physiological significance of insecticidal hormoligosis. The 4th stadium larvae were treated with fenvalerate at LD 2 5 or LD 5 0 . More eggs were laid by treated females at LD 2 5 than untreated females, although the difference was only marginally significant (p=0.07). However, the eggs laid by treated females at LD 2 5 and LD 5 0 were significantly smaller in size than those laid by the control. The reproductive effort (fecundity×egg size) did not differ between treated females and the control. The treatment of a sublethal dose (LD 5 0 ) against the parent affected the development and survival of offspring at immature stages of males. The hatchability of smaller eggs laid by treated females at LD 2 5 tended to be lower than those of controls under different humidity conditions, and the difference was apparent at a humidity of 29%. The survival rate of the offspring at immature stages was lower in the treatment group (LD 2 5 ) than in the control group, and development tended to be prolonged in the former group at temperatures higher than 20°C.

applied entomology and zoology

Changes in egg size of the diamondback moth Plutella xylostella(Lepidoptera: Yponomeutidae) treated with fenvalerate at sublethal doses and viability of the eggs.