Interactions of host-plant-resistance and seed treatments on soybean aphid (Aphis glycines Matsumura) and soybean cyst nematode (Heterodera glycines Ichinohe)

Date
2017-11-21
Authors
Clifton, Eric
Tylka, Gregory
Gassmann, Aaron
Hodgson, Erin
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Entomology
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Abstract

BACKGROUND: Soybean cyst nematode, Heterodera glycines, and soybean aphid, Aphis glycines, are invasive, widespread and economically important pests of soybean, Glycines max, in North America. Management of these pests relies primarily on use of pesticides and soybean germplasm with genetic resistance. A three-year field study and complementary greenhouse experiment were conducted to determine the benefits of host-plant resistance (HPR) and pesticidal seed treatments for managing pest populations and preserving soybean yield.

RESULTS: Host-plant resistance significantly decreased the abundance of A. glycines and, in most study sites, suppressed H. glycines. Neonicotinoid seed treatment reduced A. glycines abundance on the cultivar that was susceptible to both aphids and nematodes, but abamectin nematicide seed treatment had no effect on H. glycines populations in the field or greenhouse.

CONCLUSION: These results suggest that the seed treatments included in our experiments may suppress pests, but not consistently for all soybean cultivars or study sites. Ultimately, HPR more consistently reduced pest numbers compared to the use of pesticidal seed treatments. The planting of HPR cultivars should be a primary tool for integrated pest management of both soybean pests.

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This is the peer reviewed version of the following article: Clifton, E. H., Tylka, G. L., Gassmann, A. J. and Hodgson, E. W., Interactions of host-plant-resistance and seed treatments on soybean aphid (Aphis glycines Matsumura) and soybean cyst nematode (Heterodera glycines Ichinohe). Pest. Manag. Sci., which has been published in final form at doi: 10.1002/ps.4800. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.

Keywords
abamectin, invasive pests, integrated pest management, soybean aphid, soybean cyst nematode, thiamethoxam
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