Table 2 from:
Grove, G. G., Lunden, J., and Spayd, S. 2005. Use of petroleum derived spray oils in Washington grapevine powdery mildew management programs. Online. Plant Health Progress doi:10.1094/PHP-2005-0317-01-RS.
Table 2. Effect of postinfective fungicide applications on severity of foliar and fruit powdery mildew on ‘Lemberger’ grapevines.
a Fungicide program initiated when first signs of foliar powdery mildew were observed.
b Fungicide program initiated at 15-30 cm shoot stage, then every 14 days until veraison.
c Percent leaf area affected by powdery mildew.
d Percent cluster area affected by powdery mildew.
e Includes chemical and application (labor, equipment, fuel, maintenance, and depreciation) costs.
© 2005 Plant Management Network.