Research Article 
Role of Moth Scales Remain on the Top of Egg Masses of Spodoptera littoralis and its Interference with the Performance of the Natural Bio-product Spinosad
Journal of Entomology, 2006, 3(2), 102-107.
Abstract
During the peak of egg deposition of Spodoptera littoralis (Lepidoptera:Noctuidae), the ratio of naked to medium-covered to fully-covered egg masses was 10:2:1, respectively. Also, the ratio between egg masses located on the upper to the lower surface of the cotton leaf was 0.5:99.5, respectively. Based on laboratory test, performance of spinosad on naked egg masses was faster and greater than on fully-covered egg masses. Results of LC50 were 2.43-0.18 ppm for naked and 38.36-2.59 ppm for fully-covered egg masses at 12 and 24 h after hatching, respectively. Fully-covered eggmasses may indicate a false resistance to spinosad of the same host insect strain.
ASCI-ID: 48-61
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