Prospects for the biological control of foliar plant diseases in Danish greenhouses.
Details are given of the research programme initiated in 1996 and directed towards the management of grey mould (Botrytis cinerea) and powdery mildews (Erysiphales) in tomatoes, cucumbers and potted roses. Preliminary results indicated that rapeseed oil amended with either sodium bicarbonate or an emulsifier showed promise in the control of powdery mildew on cucumber. Tests with commercial preparations of Trichoderma spp. against B. cinerea were inconclusive. Ulocladium atrum showed promise as a preemptive colonist of senescent and wounded rose tissues, inhibiting sporulation of B. cinerea.