Journal of Economic Entomology (2003) 96, 246-250

Christopher Tipping, Veronique Bikoba, Gabriel J. Chander and Elizabeth J. Mitcham (2003)
Efficacy of Silwet L-77 against several arthropod pests of table grape
Journal of Economic Entomology 96 (1), 246-250
Abstract: Silwet L-77, an organosilicone surfactant, was applied to several arthropod pests of California table grapes. Eggs of grape mealybug, Pseudococcus maritimus (Ehrhorn), and omnivorous leafroller, Platynota stultana Walsingham, were tolerant to 0.1, 0.25, and 0.5% treatment solutions; however, eggs of Pacific spider mite, Tetranychus pacificus McGregor, were highly susceptible with mortality >99.4% (0.1% Silwet L-77). Mortality of immature and adult stages of cotton aphid (Aphis gossypii Glover), Western flower thrips (Frankliniella occidentalis Pergande), and Pacific spider mite (Tetranychus pacificus McGregor) was > 93.8, > 98.5, and > 99.4% for 0.1, 0.25, and 0.5% Silwet L-77, respectively. Grape mealybug crawlers had 100% mortality when treated with 0.5 and 1.0% Silwet L-77 solutions; however, mortality was only 6.7% when 0.1% Silwet L-77 was applied. 'Thompson Seedless' table grapes were not damaged when treated with up to 1% Silwet L-77; however, grapes treated with the 0.5 and 1.0% solutions appeared wet after removal from cold storage because of the effect of the surfactant spreading the water condensation. Grapes dried with the normal bloom on the berries when they reached room temperature.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Elizabeth J. Mitcham

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

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Aphis gossypii	Grapevine (Vitis)	U.S.A. (SW)
	Frankliniella occidentalis	Grapevine (Vitis)	U.S.A. (SW)
	Platynota stultana	Grapevine (Vitis)	U.S.A. (SW)
	Tetranychus pacificus	Grapevine (Vitis)	U.S.A. (SW)
	Pseudococcus maritimus	Grapevine (Vitis)	U.S.A. (SW)