Estimation of an adequate treatment frequency for insecticides in cereals, based on registration in the monitoring system of the extension service

agricultural warning services application rates avertissement agricole control de plagas cultivos de invierno cultivos de primavera culture d'hiver culture de printemps danemark denmark dinamarca dose d'application etapas de desarrollo de la planta hordeum insecticidas insecticide insecticides lema lutte antiravageur macrosiphum pest control pests of plants plagas de plantas plant developmental stages ravageur des plantes spring crops triticum winter crops