Insect pest and natural enemy populations in paired organic and conventional apple orchards in the Yakima Valley, Washington.

acarina agriculture biologique auxiliaire de lutte biologique biological control organisms carbamate carbamates carbamatos chemical control control de insectos crop losses depredadores enemigos naturales ennemi naturel huerto frutal insect control insecte nuisible insecticidas insecticide insecticides lutte antiacarien lutte chimique malus pumila mite control natural enemies orchards organic farming organophosphorus compounds parasite parasites pest insects pesticide pesticides plaguicidas population density predators verger washington