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The continuing battle against rose powdery mildew

The continuing battle against rose powdery mildew

Bulletin, Colorado Flower Growers' Association, 252, 5-6

This is a reprint of Flower and Nursery Report, Agricultural Extension Service, California University, April 1971. In trials with 4 fungicides against powdery mildew (Sphaerotheca spp.) the experimental compound EL-273 (4.5% at 1 pt/100gal) was outstandingly effective. With spraying intervals of 7 weeks the disease severity was less than with fortnightly spraying.

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