Pacific Northwest 1998 An Online Guide to Plant Disease Control

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OSU Extension Office
 
Blueberry -- Chemical Injury
 
Cause: Fruit russeting has been observed with late treatments of chlorothalonil (Bravo products and maybe Echo) or triforine (Funginex) at high rates. The russeting can resemble cold injury to fruit. Injury from Bravo is more common when air temperatures are high. The cultivar Bluetta was very susceptible to chemical injury during 2002 disease control trials in western Oregon.
Symptoms: Fruit develop small, roughened areas after bloom that are reddish-brown. These diffuse areas looked netted and slightly raised. Berries may crack or split close to harvest.

Russetted patches on the side of the berry due to late bloom applications of Bravo.

Russetted fruit due to late applications of Funginex.

 
Control: Do not use these fungicides during late bloom stages.
Content edited by: Jay W. Pscheidt on January 1, 2009
 
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