Eggs of Indianmeal moth, Plodia interpunctella (Hübner) were exposed for 0, 1, 3, 6, 12 and 18 hours on concrete treated with 0.0013 mg active ingredient [AI]/cm2 of the juvenile hormone analog hydroprene. Eggs were exposed at 16, 20, 24, 28 and 32ºC, and there were six replicates for each treatment combinations. After eggs were exposed, they were removed from the treated concrete and held at the same temperatures until hatching.
Mortality of eggs in the untreated controls ranged between 0 to 16% and increased slightly as temperature increased. Among the treatments, egg mortality increased proportionately as exposure time and temperatures increased. Egg mortality was only 4% at 16ºC when eggs were exposed for 1 hour. Maximum mortality was 72% when eggs were exposed for 18 hours at 32ºC. A polynomial model described the relationship at 16, 20 and 24ºC and a linear model described the relationship at 28 and 32ºC.
Developmental time of eggs on untreated controls was 2.5 to 14.3 days depending on temperature. Among the treatments, egg developmental time increased as exposure time increased and decreased as temperatures increased. When eggs were exposed for 1 hour, the longest development time was 14.8 days at 16ºC and the shortest development time was 3.6 days at 32ºC. At 16ºC, there was no relationship between developmental time and exposure interval, while at 20, 24, 28 and 32ºC, polynomial models described the relationship between development time and treatment combinations.
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