Enhanced Control of Powdery Mildew of Greenhouse Roses using Piperalin Tank-mixed with Quaternary Benzophenanthridine Alkaloids

in HortScience
Authors:
Michael J. Roll1Dept. of Horticulture and Landscape Architecture, Colorado State University, Fort Collins, CO 80523-1173

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Steven E. Newman1Dept. of Horticulture and Landscape Architecture, Colorado State University, Fort Collins, CO 80523-1173

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Ronald J. Harkrader2Camas Technologies, Inc., 4325 State Highway 66, Longmont, CO 80504

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A formulation of quaternary benzophenathridine alkaloids (QBA) was combined with piperalin as a tank mix. The QBA was applied at 150 mg/L and piperalin, at the labeled rate, was applied as a spray application to greenhouse roses infected with Sphaerotheca pannosa var. rosae (powdery mildew). Copper sulfate pentahydrate and fenarimol were also applied to mildew-infected plants within the same greenhouse at their respective label rates for comparison. Initial infection for the QBA/piperalin combination spray was 45% of the leaflet surface area, 3 days after application the infection was reduced to 10%, 6 days after application infection was reduced to 5%, and 14 days after application the infection remained at 5%. Initial infection for a QBA application without piperalin was 25% of the leaflet surface area. Three days after application, the infection was reduced to 15%; 6 days after application the infection remained at 15%; and 14 days after application, the infection was reduced to 10%. The data reveals that the QBA/piperalin combination gives a short-term as well as a long-term fungicidal and fungistatic activity.

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