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Proline (fungicide) Registration for Blueberries

Proline (prothioconazole), a Bayer product, has been registered for blueberries. This is another demethylation inhibitor (DMI), FRAC Group 3 fungicide – similar to Indar, Orbit, and Quash, though it is listed in a triazolinthione chemical group, as opposed to a triazole group.

In Georgia, we do not have blueberry research data with this fungicide, but research will be conducted this year. There are very few research trials that have been reported for this product on blueberries. However, from the four trials I could find, it does appear the Proline will provide equivalent control of mummy berry to that of Indar. As a DMI, I would recommend that it be tank-mixed with Captan, just as Indar, when utilized in the bloom sprays. Proline appears to have some activity on both Botrytis and anthracnose fruit rots as well, and though not reported, I would expect leaf spot activity (likely Septoria and rust). There is no data available relative Exobasidium management, but as a DMI, it may have activity, especially when tank-mixed with Captan during bloom – no guarantees though. Producers may wish to take a “wait and see” approach till we have more data, but some may be interested in this product.

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About Phil Brannen

Phil Brannen is a Professor in the Plant Pathology Department at the University of Georgia. He attended the University of Georgia for his undergraduate degree in Plant Protection and Pest Management, where he also received an M.S. in Plant Pathology, followed by a Ph.D. in Plant Pathology from Auburn University. He has extensive experience with disease management programs in numerous cropping systems. He serves as the extension fruit pathologist for Georgia – conducting research and technology transfer for multiple fruit commodities. His blueberry efforts are directed towards developing IPM practices to solve disease issues and technology transfer of disease-management methods to commercial blueberry producers. He also teaches the graduate level Field Pathology Course, team-teaches the IPM Course, coordinates the Viticulture and Enology in the Mediterranean Region Course (Cortona, Italy), and guest lectures in numerous other courses throughout the year.