Abstract
From 1986 to 1993, wheat crops from plots which had been cultivated with cereals for various lengths of time were assessed for the major foot and root diseases : eyespot (Pseudocercosporella herpotrichoides), take-all (Gaeumannomyces graminis) and sharp eyespot (Rhizoctonia cereals). For each disease, mean frequency and severity were modelled as a function of the number of years of continuous cereal cropping.Both take-all and eyespot increased during the first 3 to 5 years of monoculture before disease decline was observed. Decline was more important for take-all severity than frequency, whereas it was considerably stronger for eyespot frequency than severity. Take-all decline started sooner than eyespot decline. Model quality was highest for eyespot frequency and lowest for take-all frequency and severity.The incidence of sharp eyespot was too low to observe any influence of crop succession. We observed however an important year effect and a negative correlation with eyespot.
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