Unique Vapor Activity by CGA-64251 (Vangard) in the Control of Powdery Mildews Roomwide in the Greenhouse

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Abstract
Unique and complete control of powdery mildews in 112-m3 greenhouse rooms at 21-28.degree. C was achieved for 3 mo. and longer by vapor action of CGA-64251 (Vangard) applied to cheesecloth, cotton or olefin fiber cord, or polypropylene shading cloth. The vapor inhibited spore germination and repressed mildew colonies. The powdery mildew fungi controlled in these trials were Podosphaera leucotricha (on apple), Sphaerotheca fuliginea (on cucurbits), Erysiphe polygoni (on beans and peas), Uncinula necator (on grape), S. pannosa (on rose), Oidium caricae, (on papaya), and E. cichoracearum (on broadleaf plantain). The vapor phase control was highly effective in greenhouses into which outside air was introduced through vents and evaporative coolers. No phytotoxic effect of CGA-64251 vapor on exposed plants was detected. When these plants were moved from a CGA-64251-treated to an untreated room, the foliage was readily colonized by their respective mildews.

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