Abstract
The role of the loculoascomycete M. eutypoides in a collapse of C. melo plants was evaluated. Field trials and inoculation experiments showed that the organism was a primary pathogen in an extremely hot and arid area of Israel. The fungus caused a root rot that led to an early collapse of the plants. Fumigation of soil with methyl bromide, metham-sodium and ethylene dibromide with or without chloropicrin delayed symptom expression, the extent of which depended on the efficacy of the treatment. The relation between the thermophilic nature of the pathogen and the environment on which it is found is discussed.

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