Application of the Cabbage Looper Equivalents model to lepidopterous pests of Brussels sprouts in Prince Edward Island

application date brassica oleracea gemmifera chemical control choix de la date control de insectos date de traitement fecha de tratamiento feuille foliage hojas insect control insect pests insecte nuisible insecticidas insecticide insecticides larvae larvas larve leaves low input agriculture lutte chimique modele modelos models pest insects pieris rapae plutella xylostella population density prince edward island timing treatment date trichoplusia ni