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United States Department of Agriculture

Agricultural Research Service

Title: Signals Are Involved in Parasitism and Host Range Sporidesmium Sclerotivorum, a Mycoparasite of Sclerotia of Sclerotinia Minor and Other Sclerotiniaceae.

item Mischke, Barbara

Submitted to: Phytopathology
Publication Type: Abstract Only
Publication Acceptance Date: July 31, 1996
Publication Date: N/A

Technical Abstract: Sporidesmium has been used at markedly low application rates to provide economical biocontrol of lettuce drop caused by S. minor. Valuable attributes of this obligate parasite include its ability to spread through soil and its narrow host range. Signals between the host and mycoparasite are integral to successful mycoparasitism, which depends upon a series of events including recognition, stimulation of germination, contact, penetration, symbiosis and parasitism, and reproduction of the mycoparasite. Fungi that are taxonomically related to S. minor produce the germination signal (sporigermin) or related compounds. Evidence will be provided to show whether the remaining events occur with various hosts so that Sp. sclerotivorum can parasitize sclerotia of other Sclerotiniaceae.

Last Modified: 4/22/2015
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