Abstract
Adjuvant effects of Tween 80 on the fungicidal action of benomyl were studied using six plant pathogens grown on solid medium. The effects attained to maxima at 500010, 000 ppm of Tween 80, while the sole system of Tween 80 did not show fungicidal action even at such high concentrations.Adjuvant effects of other four POE sorbitan fatty acid esters on the fungicidal action of benomyl were also observed and the effects were appeared to be maxima approximately at HLB 12. Effects of Tween 80 on fungicidal actions of thiophanate methyl, maneb and triazine besides benomyl were examined and adjuvant effects were observed except triazine. Phytotoxicity of Tween 80 to soybean and rice plant seedling was extremely weak compared with Emulgen 910. It was supposed that adjuvant effects of Tween 80 might be due to increase in solubility of fungicides in water.
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