Abstract
Rain and temperature are reportedly of major importance in infection and colonization of wheat by Fusarium graminearum (teleomorph Gibberella zeae). The present review was undertaken to estimate changes in wheat scab in Hokkaido, northern Japan during 1980 to 2000 and to correlate these changes with weather variables. The results indicated that the abnormal low temperature at June to July and rainfall at August (over 200mm) are the most critical factors determining severe scab damage of wheat crops in Obihiro area, Hokkaido. There were close correlation between abnormal weather conditions and deoxynivalenol contamination in scab damaged wheat grains.
