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Disease Control and Pest Management

Effect of Benomyl on Soybean Endomycorrhizae. J. E. Bailey, Graduate research assistant, Department of Botany and Plant Pathology, Michigan State University, East Lansing, MI 48824; G. R. Safir, associate professor, Department of Botany and Plant Pathology, Michigan State University, East Lansing, MI 48824. Phytopathology 68:1810-1812. Accepted for publication 7 July 1978. Copyright © 1978 The American Phytopathological Society, 3340 Pilot Knob Road, St. Paul, MN 55121. All rights reserved.. DOI: 10.1094/Phyto-68-1810.

Soil drenches of benomyl (methyl-1-[butylcarbamoyl]-2-benzimidazole carbamate) at 2.5, 25, 125, and 250 μg/g of soil were added to pots newly planted to soybeans and containing 120 chlamydospores of Glomus fasciculatus per 100 g of soil. Mycorrhizal infection (recorded as percent of root length colonized) was decreased from 70–80% to approximately 45% by 25 μg benomyl per gram of dry soil in one experiment and by 2.5 μg/g in another. Concentrations as high as 250 μg/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%.