Temperature Effects on Symptom Expression of Lettuce Black Root Rot Caused by Berkeleyomyces rouxiae

抄録

Lettuce black root rot caused by Berkeleyomyces rouxiae occurs during the hot season in Japan, whereas black root rot in other crops often develops during cooler seasons. The present study investigated the relationship between temperature and symptom severity in lettuce and other plant species. Inoculation tests conducted with different isolates revealed that symptoms on lettuce were the most severe at 25°C, whereas those on cotton, okra, and cowpea were the most severe at 15–20°C. These results align with the seasonal occurrence of lettuce black root rot in Japan. The present study provides valuable insights for predicting and managing this disease.