Abstract

Abstract A description is provided for Cladosporium cucumerinum . Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: Cucumis sativus, Cucumis melo, Cucurbita pepo . DISEASE: Scab of Cucurbits, especially cucumber ( Cucumis sativus ), muskmelon and cantaloupe ( C. melo ), and pumpkin, squash and marrow ( Cucurbita pepo ). Symptoms are most severe on the young fruit where deeply sunken lesions are formed, up to 1 cm diam. and with a gummy exudate. On older fruit infection is restricted by the host reaction and results in the formation of brown, cork-like scabs. Foliage infection (necrotic, water-soaked spots sometimes with a gummy exudate) is not very destructive. Sporulation on the leaf tends to be sparse. At favourable temperature the apical shoots of young plants are killed back. GEOGRAPHICAL DISTRIBUTION: Widespread in N. America and Europe; also in parts of Africa, S. and E. Asia, Panama and Trinidad. The disease has not been reported from Australasia or S. America (CMI Map 310, ed. 2, 1968). Additional records not mapped are Israel and Lebanon. TRANSMISSION: Probably by air dispersed conidia, and the pathogen survives between crops on host debris. Although seed treatment has been recommended (34: 341; 44, 311) C. cucumerinum is probably rarely seed-borne (47, 3058).

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