The effect of tillage regime, row spacing, and seeding rate on feeding damage by flea beetles, Phyllotreta spp. (Coleoptera: Chrysomelidae), in canola in central Alberta, Canada

brassica brassica campestris brassica napus cantidad de semilla requerida cero-labranza control cultural control de insectos crop losses cultural control espacement espaciamiento insect control insecte nuisible insecticidas insecticide insecticides labranza lindane lindano lutte culturale pest insects pests of plants phyllotreta phyllotreta cruciferae phyllotreta striolata plagas de plantas ravageur des plantes seed treatment sowing rates spacing tillage traitement des semences tratamiento de semillas travail du sol zero tillage