Application of multiple regression in the prediction of optimum timing for chemical control of creal beetles (Oulema spp.) in Wielkopolska region (Poland)

animal developmental stages cereal crops chambre de croissance chemical control choix de la date ciclo vital control de plagas cultivos de cereales date de traitement etapas del desarrollo animal fecha de tratamiento field experimentation fitotrones forecasting growth chambers insecte phyllophage insectos depredadores de las hojas laboratory experimentation larvae larvas larve leaf eating insects life cycle lutte antiravageur lutte chimique oulema pest control pests of plants plagas de plantas plant protection poland pologne polonia protection des plantes ravageur des plantes statistical methods timing treatment date