Tuesday, November 14, 2006

Fall and Spring Development of Soybean Cyst Nematode on Winter Annual Weeds in the Eastern Corn Belt.

John E. Mcmillan1, J. Earl Creech1, Andreas Westphal1, Brian G. Young2, Jared S. Webb3, Jason P. Bond2, S. Kent Harrison4, and William G. Johnson1. (1) Purdue Univ, Lilly Hall Life Sciences, 915 W State St, West Lafayette, IN 47907, (2) Southern Illinois Univ - Carbondale, Dept of Plant and SoilS, Mailcode 4415, Carbondale, IL 62901, (3) Southern Illinois Univ, Dept of Plant Science, Soil Sciences, Mailcode 4415, Carbondale, IL 62901, (4) Ohio State Univ, 310E Kottman Hall, 2021 Coffey Rd, Columbus, OH 43210

Soybean Cyst Nematode (Heterodera glycines; SCN) is a very serious problem in Midwest soybean production that can result in significant yield reduction. Purple deadnettle (Lamium purpureum) and henbit (Lamium amplexicuale) are winter annual weeds that have been identified as alternative hosts for SCN. We conducted a survey to document SCN reproduction levels in the spring and fall in different environments across three Midwestern states. A field survey of three sites in Indiana, Ohio and Illinois, was conducted in 2004 and 2006. Twenty-five plants were collected from each site in both the fall and spring, and were processed in the lab. SCN reproduction on henbit and purple deadnettle occurred on all sites. Juvenile numbers are typically higher in the spring. Therefore, failure to control winter annual weeds may lead to a increase in SCN population density.