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Ascospore Release of Togninia minima, Cause of Esca and Grapevine Decline in California

S. Rooney-Latham, A. Eskalen, and W. D. Gubler

February 2005


Esca and grapevine decline in CA are caused primarily by Phaeomoniella chlamydospora and Phaeoacremonium aleophilum. The authors produced perithecia of Togninia minima, the newly-described teleomorph of P. aleophilum, and used video to document the process of emerging asci and release of ascospores from perithecia. Also, naturally occurring perithecia were discovered in infected CA vineyards. These studies suggest the importance of ascospore release in the disease cycle of esca in California vineyards.


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