ABSTRACT
Four field experiments were conducted at Prestwold Hall, Noseley Hall, and Saxelby Park in the Midlands of the U.K. Adjuvants known to enhance deposition were admixed with solutions containing the fungitoxicants iprodione (Rovral®), vinclozolin (Ronilan®), carbendazim (Stempor®), mancozeb (Penncozeb®), and chlorothalonil (Bravo®). In various fungicide combinations, adjuvants comprising synthetic latex (Bond®), acidified soyal lecithin (LI700), pinolines (Nu-Film®, Sprayfast®), and an emulsified mineral oil (Actipron®) were tested.
Only LI700 enhanced the performance of the systemic carbendazim, while Bond was highly effective in increasing the performance of some protectant fungicides in controlling Botrytis. However, adjuvant-fungitoxicant interactions were highly specific. Enhancement of dicarboxamide activity by Bond increased the control of Botrytis by iprodione, but not by vinclozolin. For fungicides where Bond was highly effective in increasing disease control, LI700 was also effective.
When applied with a proprietary fungicide comprising both iprodione and thiophanate-methyl (Compass®), Bond increased Botrytis spp. control, Nu-Film and Sprayfast reduced control, and Actipron had no effect.
