Effect of Benomyl on Soybean Endomycorrhizae

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Abstract
Soil drenches of benomyl (methyl-1-[butylcarbamoyl]-2-benzimidazole carbamate) at 2.5, 25, 125 and 250 .mu.g/g of soil were added to pots newly planted to soybeans [Glycine max cv. Hark] and containing 120 chlamydospores of Glomus fasciculatus/100 g of soil. Mycorrhizal infection (recorded as percent of root length colonized) was decreased from 70-80% to approximately 45% by 25 .mu.g benomyl/g of dry soil in 1 experiment and by 2.5 .mu.g/g in another. Concentrations as high as 250 .mu.g/g did not decrease infection further. Benomyl prevented increased plant growth due to the vesicular-arbuscular mycorrhizae even with fungal colonization of the root system as high as 48%.

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