Abstract
Abstract A description is provided for Botrytis allii . Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: Various species of Allium . DISEASE: Causes grey mould neck rot of onion bulbs in storage and is associated with a leaf blast of seedlings. Scales in the neck region of diseased bulbs shrivel as a brown soft rot develops. As the rotting zone spreads down into the bulb a grey mass of spores and mycelia develops beneath the shrivelled dead scales. A similar rot may also start at the sides or base of bulbs. Botrytis allii may also cause or aggravate leaf blast or damping-off of young seedlings in which other species of Botrytis are involved and may attack flowers (45, 1594). GEOGRAPHICAL DISTRIBUTION: Europe, N. America, N. and E. Africa, Australia, S.E. Asia (CMI Map 169, ed. 2, 1966). Additional countries since include many in S.E. Asia and Middle East (S. Vietnam, Korea, Taiwan, Nepal, Iran, Israel, Jordan, Afghanistan, Saudi Arabia, Rumania) N. Africa (Morocco), Central and South America (Guatemala, Costa Rica, Panama, Venezuela, Chile). TRANSMISSION: Mostly by air-borne conidia, which are produced from diseased bulbs and leaves from infected plant debris and sclerotia. These inoculum sources are largely soil-borne, and seed transmission also occurs (Noble & Richardson, Phytopathological Paper 8, 1968).
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