agriculturalecology agriculture alienplants aspectdel'environnement biological biologicalcontrol biologicalpestcontrolagents california canada casestudies congresses control croissance diseasesandpests droitdepassage ecology effectofherbicideson engelmannspruce engineering environmentalaspects gardenanimals gardenecology gardenpests general gestion greatbritain groundcoverplants growth herbicides history horticulture identification integratedcontrol lawandlegislation lawns livestockpoisoningplants luttecontrelesmauvaisesherbes mexico microbialherbicides naturalhistory naturalpesticides north northamerica northwest ontario organicgardening pacific pestcontrol pests physiology phytopathogenicmicroorganisms pictorialworks plantdiseases plantintroduction plantinvasions plants prairieprovinces protectionof rangelands rightofway seeds sociologicalaspects south spruce technology texas unitedstates vegetationmanagement végétation weedcontrol wildlifeattracting épinette épinetted'engelmann