REPRODUCTIVE POTENTIAL AND DEVELOPMENT OF ROSE LEAFHOPPER, EDWARDSIANA-ROSAE (L) (HOMOPTERA, CICADELLIDAE), AT CONSTANT TEMPERATURES ON APPLE

Reproductive potential and developmental rates for rose leafhopper, Ed wardsiana rosae (L.), were determined in a constant-temperature study at 13, 17, 23, and 30 degrees C. Developmental rate was faster at prog ressively higher temperatures, except at 30 degrees C, where there was no egg hatch. Developmental rate was faster for males than for female s at each temperature. Regression equations yielded an estimate of 7 d egrees C as the temperature threshold for development. The largest num ber of progeny was produced at the lowest temperature, and survival de creased with increasing temperature. Body length and head capsule widt h of the five nymphal instars and adult stages of rose leafhopper did not vary among temperatures or between male and female.