Environmental Entomology (1981) 10, 501-505

Mark E. Ascerno, Zane Smilowitz and Arthur A. Hower Jr. (1981)
Effects of the insect growth regulator hydroprene on diapausing alfalfa weevils
Environmental Entomology 10 (4), 501-505
Abstract: Hydroprene, when topically applied, terminated sexual diapause of adult Hypera postica (Gyllenhal). Significant changes in gonadal development, oviposition, and feeding were related to the concentration applied. A 1-µg amount of hydroprene terminated diapause in 15% of weevils, did not influence testis size, produced small increases in ovary size, instigated atypical oviposition in 10% of females, and increased feeding for 27 days. A five-µg amount terminated diapause in 37% of weevils, produced moderate increases in testis and ovary size, instigated atypical oviposition in 20% of females, and increased feeding for 27 days. A 10-µg amount terminated diapause in 66% of weevils, produced large increases in testis and ovary size, instigated atypical oviposition in 60% of females, and increased feeding for 37 days. A 50-µg amount terminated diapause in 100% weevils, produced large increases in testis and ovary size, instigated typical oviposition in 90% of females but with reduced egg fertility, and increased feeding for 49 days.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)

Research topic(s) for pests/diseases/weeds:
control - general
general biology - morphology - evolution

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Hypera postica