|Freeze-injured flowers are predisposed to flower blight|
|Masses of spores are visible on the infected flower bud at center|
|Post-harvest Botrytis fruit rot|
The best control measure for this disease on blueberry is warm, dry weather! With dry, sunny days any freeze-damaged flowers will quickly dry out and fall off. However if cool wet weather is anticipated, the use of a fungicide may be warranted, and there are a number of labeled fungicides for control of this disease. If you are already spraying fungicides for mummy berry, this might be a good year to include a product that has activity against flower blight. Recommended products can be found at smallfruits.org in the Blueberry IPM Guide. Page 31 lists the relative effectiveness of fungicides against this disease. Some good choices would be CaptEvate, Elevate, Pristine or Switch. As always, read and follow the label.