Biological control of Botrytis cinerea by Ulocladium atrum in grapevine and Cyclamen.

摘要

The saprophytic hyphomycete Ulocladium atrum was antagonistic to B. cinerea and field experiments with grapes in Germany over the last 2 years demonstrated the antagonistic effect. Under controlled conditions the antagonist was insensitive against most fungicides used in conventional disease control. This effect was also shown under field conditions. The antagonist can therefore be easily integrated into existing crop protection systems. The results of field experiments with grapes at Marienthal in1997, and at Geisenheim and at Marienthal in 1998 confirmed the antagonistic effect of U. atrum against grey mould. At both examined locations this effect could be observed in cultivars Muller Thurgau and Riesling. The antagonist was also effective in Cyclamen. In various cropping systems rot of leaves and petioles caused by B. cinerea was significantly reduced. Only under extremely high disease pressure did U. atrum or fungicides have no effect.