Etude du profil cultural de deux sites, l'un infesté, l'autre non, par Heterodera avenae Woll.: conséquences sur le développement radiculaire du blé tendre d'hiver

Abstract

consequences on the root development of the winter wheat. The cereal cyst nematode Heterodera avenae is a strict parasite to cereals. Its effect was studied on the development of the root system of the wheat in a calcareous soil near Argentan (Normandy). In two closed experimental plots "uninfested" or "infested" by the nematode, whose soil were perfectly identical, particularly for the macroporosity, the root system of the wheat was significantly more important and also clearly more superficial in the second than in the first site.A suitable soil for the root development could be left unused by the root system of the wheat if an attack of the pathogen changed its natural growth. In an "infested" site, the very high density of nematodes, located essentially in the ploughed part of the soil, constituted a real difficulty for the exploration in depth by the roots. It would contribute also to a more superficial location of the roots for the following cereals crops. cultural profile -infestation -Heterodera avenae -root development -winter wheat