Biological control of Monilinia and Botrytis blights in lowbush blueberries

Thumbnail Image



Langdon, Donna H.

Journal Title

Journal ISSN

Volume Title


University of Guelph


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.



biological controls, Monilinia vaccinii-corymbosi, Botrytis cinerea, blight pathogen, lowbush blueberry, commercial biological controls, biological control activity