Abstract
An acute and severe cucumber wilt which was caused by Phytophthora melonis KATSURA or the relative species occured on a field in Sagano district of Kyoto in late June, 1974. The field provided a naturally infested soil that should be most desirablly used for evaluation of disease control measure.
Utsugi's grafting-cutting method of cucumber with two varieties of squash (Kurodane and Shintosa) as the stock plants showed a marked effect controlling the disease. The wilting rate averaged from the two separate experiment, were 59.7%, 7.0% and 3.6% on ungrafted, grafted with Kurodane and with Shintosa respectively. In the grafted plants, all of the infected portions were the basal stems of cucumbers.
