Should I add adjuvants to fungicides for ASR control?
Many fungicide labels recommend adding surfactants, crop oil concentrates, or other adjuvants to fungicides for ASR control. Surfactants reduce the surface tension between the spray droplet and leaf. Certain adjuvants will improve penetration into the leaf. Therefore, the addition of adjuvants could improve fungicide efficacy. However, the addition of adjuvants to some fungicides has resulted in increased soybean leaf burn or phytotoxicity. Most reports of phytotoxicity have been with the triazole family of fungicides. In addition, the severity of the leaf burn may be related to soybean cultivar. Until more is known about the potential phytotoxicity of fungicide-adjuvant combinations on soybean, one should only add adjuvants listed on the fungicide labels. Be sure to consult individual product for adjuvant compatibility and other factors that might alter crop phytotoxicity.
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- Should I add adjuvants to fungicides for ASR control?
