[Development of biological methods for weed control]

agricoltura biologica agricultura orgánica agriculture biologique alelopatia allelopathy allelopatia allélopathie arthropode auxiliaire artrópodos para control biológico biological competition biological control biological control arthropods champignon chemical control competencia biológica competizione biologica compétition biologique control biológico control químico controllo biologico convolvulus arvensis cropping systems cuscuta diserbo désherbage eichhornia crassipes escarda funghi fungi germinación germination germinazione hongos lutte biologique lutte chimique malezas mauvaise herbe organic agriculture orobanche phomopsis piante infestanti poa annua polygonaceae rumex seed seme semence semillas sistemas de cultivo sistemi di coltivazione système de culture taraxacum weed control weeds