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PERSISTENCE OF INSECTICIDES IN A LOBLOLLY PINE SEED ORCHARD FOR CONTROL OF THE LEAFFOOTED PINE SEED BUG, LEPTOGLOSSUS CORCULUS (SAY) (HEMIPTERA: COREIDAE)

Published online by Cambridge University Press:  31 May 2012

J.C. Nord  and
G.L. DeBarr
J.C. Nord
Affiliation:
USDA Forest Service, Southeastern Forest Experiment Station, Forestry Sciences Laboratory, Green Street, Athens, Georgia, USA30602
G.L. DeBarr
Affiliation:
USDA Forest Service, Southeastern Forest Experiment Station, Forestry Sciences Laboratory, Green Street, Athens, Georgia, USA30602
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Abstract

High volume sprays of azinphosmethyl, chlorpyrifos, fenvalerate, permethrin, and phosmet in various concentrations and formulations were simulated on loblolly pine (Pinus taeda L.) foliage in a pine seed orchard in northern Georgia. Persistence of these insecticides under field conditions was determined by weekly bioassays with adult leaffooted pine seed bugs [Leptoglossus corculus (Say)] and gas–liquid chromatography. Fenvalerate was the most persistent insecticide tested. In the first experiment, 0.2% AI fenvalerate caused virtually 100% seed bug mortality in bioassays through the 4th week after treatment, whereas mortality from azinphosmethyl dropped to ca. 14%. By the 6th week, mortality in the fenvalerate treatment was still 91%, even after 10.5 cm of rain. The permethrin treatments persisted for 2 weeks, then mortality declined below 40% at 3 weeks. In the second experiment, fenvalerate at 0.15% AI and 0.075% AI caused 95 and 90% mortality, respectively, after 3 weeks and 16 cm of rain, and the toxicity of the 0.038% and the 0.019% AI fenvalerate treatments lasted only 2 weeks with 12 cm rain. Permethrin in Ambush® EC at 0.2% AI had initial residues of about 150 ppm and caused ca. 84% mortality for 2 weeks with 12 cm rain. Azinphosmethyl WP at 0.2% AI had initial residues of ca. 104 ppm and persisted for 1 week. Seed bug mortality from phosmet at 0.4% AI diminished quickly after 1 week in the field.

Résumé

Des volumes importants d’azinphosméthyl, de chlorpyrifos, de fenvalérate, de perméthrine et de phosmet en concentrations et formules variées ont servi au cours de vaporisations à petite échelle du feuillage de Pins à encens (Pinus taeda L.) dans un boisé du nord de la Géorgie. La persistance de ces insecticides dans des conditions naturelles a été déterminée par l’application de tests hebdomadaires sur des adultes de la punaise Leptoglossus corculus (Say) et par chromatographie gaz–liquide. Le fenvalérate s’est avéré l’insecticide le plus persistant. Au cours de la première expérience, du fenvalérate à raison de 0,2% AI a entraîné une mortalité de pratiquement 100% jusqu’à la fin de la 4e semaine, mais la mortalité due à l’azinphosméthyl est tombée à environ 14%. A la 6e semaine, la mortalité due au fenvalérate était toujours de 91%, en dépit d’une pluie de 10,5 cm. Les traitements à la perméthrine ont persisté durant 2 semaines, puis la mortalité a diminué jusqu’à moins de 40% à 3 semaines. Durant la deuxième expérience, l’application de fenvalérate à raison de 0,15% AI a causé une mortalité de 95%, et une application du même produit à raison de 0,075% a entraîné une mortalité de 90%, après 3 semaines et 16 cm de pluie et la toxicité de traitements au fenvalerate 0,038% et 0,019% AI n’a duré que 2 semaines avec 12 cm de pluie. La perméthrine dans le produit Ambush® EC (0,2% AI) avait des résidus initiaux d’environ 150 ppm et a entraîné une mortalité d’environ 84% pendant 2 semaines, avec 12 cm de pluie. L’azinphosméthyl WP (0,2% AI) avait des résidus initiaux d’environ 104 ppm et une persistance de 1 semaine. La mortalité des punaises à la suite de l’application de phosmet (0,4% AI) a diminué rapidement après 1 semaine en nature.

[Traduit par la rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 124 , Issue 4 , August 1992 , pp. 617 - 629
Copyright
Copyright © Entomological Society of Canada 1992

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