Association of Spores of «Phaeomoniella chlamydospora», «Phaeoacremonium inflatipes», and «Pm. aleophilum» with Grapevine Cordons in California

Akif Eskalen, W. Douglas Gubler


Esca (black measles) of grapevine has long been known to occur wherever grapes are grown. Phaeomoniella
chlamydospora and two species of Phaeoacremonium, Pm. inflatipes and Pm. aleophilum, have been associated with
esca and Petri grapevine decline in major production regions of California. Though present in symptomatic grapevines
and capable of causing foliar symptoms of esca, Phaeomoniella chlamydospora does not cause the typical symptoms
on fruit. However, trapping studies showed that spores of Pa. chlamydospora, Pm. inflatipes and Pm. aleophilum
were captured throughout the year in vineyards ranging from the north California coast to the southern San Joaquin
Valley. They can be considered airborne fungi capable of being water-splashed by pruning or other wounds during
part of their biological cycle. Trapping of spores coincided with rainfall events for Pa. chlamydospora and Pm. inflatipes,
and to a lesser degree for Pm. aleophilum. However, this last species was trapped during periods of time when
rainfall did not occur and was trapped longer into the summer.

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