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When Do Foliar Pyraclostrobin Fungicide Applications Produce Profitable Soybean Yield Responses?

P. Kyveryga, T. M. Blackmer, and D. S. Mueller

September 2013


Across Iowa between 2005 and 2009, farmers conducted 282 field-scale replicated strip trials using precision agriculture and remote sensing technologies to identify when foliar applications of pyraclostrobin were most likely to produce profitable soybean yield responses. The results revealed the higher probability of above break-even yield response in fields with above normal (> 12 inches) cumulative spring rainfall and in fields with visual strips of fungicide-induced "greening effect" as observed by the late-season color and infrared digital aerial imagery of the soybean canopy.


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