Interactions between viruses and Phomopsis infection in soybean, and effects of integrated management strategies

Bean pod mottle virus, Soybean mosaic virus, bean leaf beetles, soybean aphids and Phomopsis spp. all affect soybean seed quality in addition to causing yield losses. However, interactions among these pests and pathogens, and the effects of combined management practices, are not well understood. To...

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Bibliographic Details
Published in:Phytopathology 2010-06, Vol.100 (6), p.S148-S148
Main Authors: Soto-Arias, J, Munkvold, G
Format: Article
Language:English
Subjects:
Aphididae
Bean pod mottle virus
Chrysomelidae
Phomopsis
Phomopsis longicolla
Soybean mosaic virus
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Summary:Bean pod mottle virus, Soybean mosaic virus, bean leaf beetles, soybean aphids and Phomopsis spp. all affect soybean seed quality in addition to causing yield losses. However, interactions among these pests and pathogens, and the effects of combined management practices, are not well understood. To understand these interactions, greenhouse studies were established to determine the effects of virus infection on susceptibility of soybean plants to infection by Phomopsis longicolla at different growth stages. Virus inoculation with either SMV or BPMV, significantly increased seed infection by P. longicolla, compared with the control or plants only inoculated with P. longicolla. To evaluate the effects of management strategies, four experiments were established in 6 locations in Iowa during 2008 and 2009. Applications of Headline at R5, or Stratego Pro by itself or in combination with insecticide at R3, significantly reduced Phomopsis spp. infection of stems and seeds. Insecticide applications alone reduced aphid and bean leaf beetle populations. In some experiments insecticide applications also reduced Phomopsis spp., SMV and BPMV infection of seeds, but this effect was not consistent. Virus incidence and beetle populations were very low in both years, and seed mottling was not observed. Phomopsis spp. infection affected seed germination in some experiments. Few treatments aimed at insect and disease control had an effect on yield.
ISSN:0031-949X