Integrated Crop Management

Another fungicide approved for soybean rust in Iowa

There has been some activity by the EPA concerning fungicides for soybean rust. The fungicide Caramba™ (metconazole), manufactured by BASF Corp., has been approved as a Section 18 fungicide in Iowa, effective on June 15, 2007. The exemption will expire on April 19, 2009. Caramba is a systemic, triazole fungicide with early infection and protectant activity. A second fungicide, Headline-Caramba™ copack, has been withdrawn by BASF and will not be available.

Label status of fungicides for soybean rust in Iowa (updated June 22, 2007).

Active Ingredient Trade Name Section 18 Section 3
azoxystrobin Quadris Yes
azoxystrobin + cyproconazole Quadris Xtra Yes
azoxystrobin + propiconazole Quilt Yes Registered but awaiting final label
chlorothalonil Bravo, Echo, Equus Yes
cyproconazole Alto Yes
famoxadone + flusilazole Charisma Pending
flusilazole Punch Yes
flutriafol Topguard Yes
metconazole Caramba Yes
myclobutanil Laredo EC, Laredo EW Yes Registered but awaiting final label
propiconazole Tilt, PropiMax, Bumper Yes Registered but awaiting final label
propiconazole + trifloxystrobin Stratego Yes
prothioconazole ProLine Pending
pyraclostrobin Headline Yes
tebuconazole Folicur, Orius, Uppercut Yes Decision expected in mid-2007
tebuconazole + pyraclostrobin Headline SBR Yes
tetraconazole Domark Yes Yes
tebuconazole + trifloxystrobin Absolute Decision expected in late 2007

Daren Mueller is an extension plant pathologist with the Iowa State University Corn and Soybean Initiative. Chuck Eckermann is chief of the pesticide bureau of the Iowa Department of Agriculture and Land Stewardship.

This article originally appeared on page 194 of the IC-498(16) -- June 25, 2007 issue.

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