The Canadian Entomologist

Articles

A LOW-SPRAY APPLE-PEST-MANAGEMENT PROGRAM FOR SMALL ORCHARDS

Ronald J. Prokopya1

a1 Department of Entomology, University of Massachusetts, Amherst, MA 01093

Abstract

From 1981 to 1984, a low-spray management program was employed against injurious arthropods on the 40 disease-resistant apple trees in my experimental orchard in Massachusetts. The program consisted of an annual early-season application of petroleum oil followed by 2 applications of phosmet (1 at petal fall and another 10–14 days later). Visual traps were used to suppress Rhagoletis pomonella flies. For all years combined, a mean of 89.7% of fruit sampled at harvest in this orchard was free of insect injury compared with 0% uninjured fruit on neighboring unsprayed trees. Populations of foliar-feeding pests never reached injurious levels.

Résumé

De 1981 à 1984, on a appliqué un programme de régie basé sur un minimum d'arrosage contre les arthropodes nuisibles à 40 pommiers résistants aux maladies dans mon verger expérimental au Massachusetts. Le programme comprenait une application annuelle hâtive d'huile suivie de 2 applications de phosmet (l'une à la chute des pétales et l'autre 10–14 jours plus tard). Des pièges visuels ont servi à supprimer les mouches de Rhagoletis pomonella. Sur l'ensemble des années, on a observé une moyenne de 89,7% de fruits exempts de dommages dus aux insectes lors de la récolte, comparé à 0% sur des arbres avoisinants non arrosés. Les populations de défoliateurs n'ont jamais atteint de niveaux dommageables.

(Received October 31 1984)

(Revised January 18 1985)

(Accepted January 20 1985)