After Harvest and Other Considerations For Blueberries

Following harvest, fungicides may still need to be applied to protect the foliage from late season fungal diseases, such as rust and Septoria leaf spot. After harvest, use a good broad spectrum preventative fungicide that can be used. You can use a fungicide with the active ingredient chlorothalonil. For most fungicides, applications can be made at 14-day intervals after harvest is complete. The number of applications is determined by disease pressure and weather conditions. You may make three or four applications at the most, but may be able to get away with just one if disease pressure is light or disease is not present.

Always scout fields frequently for the presence of diseases. Obtain an accurate diagnosis for each disease in the field. Fungicides other than the one suggested here may be better management options, depending on the particular disease and the incidence and severity of that disease. Make sure applications are made in enough water to completely cover the foliage. This will usually range from 20 gallons to 100 gallons per acre depending on plant size. The early season and late season sprays are essential to maintain good plant health and some of the mid-season sprays may not be necessary, depending on your situation.

Contact your local Cooperative Extension Service office for information specific to your area.


Cline, Bill and John R. Meyer. Blueberry Pest Management: A Seasonal Overview. June 1997. Retrieved 10 March 2010.


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