Special Local Needs label approved for Malathion in blueberries to control spotted wing Drosophila

New Special Local Needs (24c) label allows higher rate for control of spotted wing Drosophila in Michigan blueberries.

Editor’s note: On April 5, 2013, the label in this article was replaced with a slightly updated label. Please make sure you have the current, updated label.

The Michigan Department of Agriculture and Rural Development has approved a Special Local Needs (24c) label for use of Gowan Company’s Malathion 8F in blueberries. This label allows use of a 2.5 pint rate for control of spotted wing Drosophila in Michigan blueberries, and there is a 5 pint per acre limit for this product. Growers can apply only two of these high rate applications per season, with a minimum of seven days between applications. This has a 12-hour re-entry interval, a one day pre-harvest interval, and is for use through the 2016 season.

Our recent research at Michigan State University has demonstrated that this higher rate provides better residual control of spotted wing Drosophila, compared to the 1.25 pint/acre rate that is on the current federal label. The lower rate provided about 90 percent control for up to five days then dropped to 25 percent at seven days. In contrast, the 2.5 pint rate provided 100 percent control for up to five days, and at seven days dropped to 75 percent.

Future articles in the Michigan State University Extension News for Agriculture website and at the Michigan Blueberry Facts website will report on spotted wing Drosophila catches as they start in 2013, and on the best management tactics for controlling this pest.

View the Special Local Needs (24c) label.

Dr. Isaacs’ work is funded in part by MSU’s AgBioResearch.

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