Journal of Economic Entomology (1994) 87, 1185-1189

I. Ishaaya, A. De Cock and D. Degheele (1994)
Pyriproxyfen, a potent suppressor of egg hatch and adult formation of the greenhouse whitefly (Homoptera: Aleyrodidae)
Journal of Economic Entomology 87 (5), 1185-1189
Abstract: Pyriproxyfen is a potent suppressor of egg viability and adult formation of the greenhouse whitefly, Trialeurodes vaporariorum (Westwood). Exposure of T. vaporariorum adults to tomato seedlings treated with various concentrations of pyriproxyfen resulted in LC₅₀ of 0.12 and 0.10 mg (Al)/liter for suppression of egg hatch and adult emergence, respectively. Dipping of tomato seedlings infested with 0-1-d-old eggs or with first-instar larvae in various concentrations of pyriproxyfen resulted in LC₅₀ values of 0.043 and 0.036 mg (AI)/liter, respectively. Eggs >3 d old were not affected. Pyriproxyfen has no direct effect on the larval stages but suppresses adult emergence. First and third instars treated with 0.0025-0.04 mg (AI)/liter pyriproxyfen pupated normally; however, a suppression of 57 and 100% in adult emergence was observed when first and third instars were treated, respectively, with 0.04 mg(AI)/liter. With all tested concentrations, third instars were more susceptible than first instars. Reduction in egg hatch on the lower surface of tomato leaves when the upper surfaces were treated with 5 and 25 mg (AI)/liter, indicates a translaminar effect. Our findings indicate that pyriproxyfen affects all stages of T. vaporariorum either directly (ovicidal) or indirectly (transovarial and suppression of adult formation upon treatment of larvae) and could be considered a potential compound for controlling T. vaporariorum in vegetables and ornamentals.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): Isaac Ishaaya

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

---

Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Trialeurodes vaporariorum