Biological control of Monilinia and Botrytis blights in lowbush blueberries
The purpose of the current study was to identify effective biological controls for 'Monilinia vaccinii-corymbosi' and ' Botrytis cinerea', two blight pathogens of lowbush blueberry. Commercial biological controls (Mycostop, Actinovate, Prestop, Endofine, Sporodex, Serenade, BlightBan A506 and BlightBan C91) were tested under controlled environment and/or field conditions. The yeasts 'Cryptococcus victoriae' and 'Rhodotorula graminis' were also tested for biological control activity against 'M. vaccinii-corymbosi' in a controlled environment, and both yeasts reduced disease by >= 50% compared to an untreated control. 'Bacillus subtilis' QST 713 (Serenade) lowered ' M. vaccinii-corymbosi' infection of vegetative buds to almost 0 at 5 kg/ha and 8 kg/ha with two applications in controlled environment and in the field. These concentrations reduced disease when applied one day post-infection, and Serenade and propiconazole reduced the production of conidia on infected plants when applied five and seven days post-infection. Serenade enhanced conidial germination and did not reduce sporulation of 'B. cinerea ' on flowers.