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Evaluating Headline fungicide on alfalfa production and sensitivity of pathogens to pyraclostrobin

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Headline fungicide was recently registered for management of foliar diseases on alfalfa. The effect of disease control on yield, forage quality, and potential return on investment for fungicide application was determined for field experiments conducted at five locations in 2012, three in Wisconsin and two in Minnesota. Headline reduced defoliation in 12 out of 14 harvests and increased forage yield and return on investment in 5 out 12 harvests compared to the untreated control. Headline plus the insecticide Warrior II reduced defoliation in 10 out of 14 harvests and increased yield and return on investment in four harvests compared to Warrior II alone. Two common foliar pathogens were highly sensitive to pyraclostrobin, the active ingredient in Headline, with an in vitro EC50= 2.3 ng/ml for Phoma medicaginis and an EC50= 52 ng/ml for Stemphylium globuliferum. The results indicate that fungicide application can increase yields under higher disease pressure and increase crude protein when the crop is harvested at later developmental stages.
Deborah A. Samac , Bill Halfman , Bryan Jensen , Fritz Brietenbach , Lisa Behnken , Jaime Willbur , Daniel Undersander , Greg Blonde , JoAnn F. S. Lamb
USDA Scientist Submission
Plant health progress 2013 9 17
Journal Articles, USDA Authors, Peer-Reviewed
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