The Role of Ethylene in Anthracnose of Cucumber,Cucumis sativus,Caused byColletotrichum lagenarium

Cucumber (Cucumis sativus) seedlings pretreated with ethylene gas had 21% more anthracnose lesions than did controls, following inoculation with Colletotrichum lagenarium. Ethylene fumigation 24 hr after inoculation increased lesion size by 36%. Silver thiosulfate (0.1 mM), an inhibitor of ethylene action, decreased lesion number and lesion size. Silver thiosulfate did not inhibit germination, growth, or the sporulation capacity of C. lagenarium. However, scanning electron microscopy showed an inhibition of C. lagenarium conidial germination when silver thiosulfate (1 mM) was applied to the leaf surface (...)