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Quinone outside inhibitor (QoI) fungicides can improve the yield and quality of cereal crops in the absence of disease pressure through the so called “greening effect,” but little is known about the potential beneficial effects on deciduous tree fruit crops. In a multiyear and multicultivar study carried out in South Carolina (2005 and 2006) and California (2006), we examined the potential influence of the QoI fungicide pyraclostrobin on antioxidant activity and commercially important peach ( Prunus persica ) fruit quality attributes, including fruit size, coloration, firmness, soluble solids concentration, and yield. Experimental orchards were sprayed according to commercial guidelines to manage insect pests and diseases. A pyraclostrobin + boscalid mixture was applied up to five times per season starting 1 week after the physiological stage of “shuck off” until 1 to 2 weeks before harvest. Fruit size was measured weekly between “shuck off” and harvest, whereas the other fruit quality attributes were determined at harvest. Results indicate no consistent impact of the pyraclostrobin + boscalid mixture on same-year fruit size development or other fruit quality attributes in orchards with no or very little disease pressure. To our knowledge, this is the first in-depth evaluation of the potential effects of a QoI fungicide on commercially important tree fruit quality attributes.

Seasonal Applications of a Pyraclostrobin and Boscalid Mixture Do Not Impact Same-year Peach Fruit Quality Attributes