Abstract
The effect of red light irradiation on development of Corynespora leaf spot of cucumber plants (Cucumis sativus L. cv. Hokushin) caused by Corynespora cassiicola (Berk. & Court.) was investigated in greenhouses. In a greenhouse without red light (―Red), lesions enlarged, coalesced, and finally covered the entire leaves of cucumber. In a greenhouse with red light (+Red), however, lesion appearance was delayed relative to that under ―Red and its development was also significantly suppressed. Such difference in disease development was also observed in cucumbers grown under +Red and ―Red in the same greenhouse. Disease suppression under red light was also observed in glasshouse-grown C. cassiicola-inoculated cucumbers. Red light did not inhibit the infection behaviour of the pathogen. Our results indicated that the delay and suppression of Corynespora leaf spot of cucumber under + Red were due to induction of resistance in cucumber, and not to differences in environmental conditions or fungal population between the two greenhouses. Red light-induced resistance might contribute to the development of new methods for controlling Corynespora leaf spot of greenhouse-grown cucumber.
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