Abstract
Abstract A description is provided for Phomopsis vexans [Diaporthe vexans] . Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: On Solanum melongena, S. wendlandii . DISEASE: The only economic host is eggplant or brinjal ( Solanum melongena ) and the disease is variously known as tip over, stem blight or canker, leaf blight or spot and fruit rot; damping-off can also take place. Leaf spots (up to 3 cm diam.) are conspicuous, irregular in outline and may coalesce; lower leaves may be affected first. In stem lesions the cortex dries and cracks, plants become stunted and girdling cankers cause death. Fruit spots are pale, sunken, conspicuous and may affect the whole fruit; fruit may drop or remain attached, becoming mummified after a soft decay. Pycnidia are abundant. GEOGRAPHICAL DISTRIBUTION: Widespread in N. America, the West Indies, and E. and central Asia, also in Africa (Senegal, Tanzania, Zambia) and Mauritius (CMI Map 329, ed. 2, 1968). The record from Australia (NSW) should be deleted. Additional records not yet mapped are: Brunei, Haiti, Iran, Iraq, Rumania. TRANSMISSION: Host debris and seed from infested fruit are primary sources of inoculum. Naturally infected seed germinates less well and more slowly (20: 621; 22: 511).
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