No. 23 Article 6/October 5, 2007

Whiteflies in Soybeans in 2007

In the article "Whiteflies and Twospotted Spider Mites in Soybeans" published in issue No. 20, August 10, 2007, of the Bulletin, we referred to the numerous reports of observations of unusually large numbers of whiteflies in soybeans. Being the curious entomologists that we are, I and Kevin Black, insect/plant disease technical manager with Growmark in Bloomington, sent some samples of the critters to specialists with the Florida Department of Agriculture and Consumer Services. On September 5, Greg Hodges determined that the species we sent was Trialeurodes vaporariorum, usually referred to as the greenhouse or glasshouse whitefly, not the more dreaded Bemisia tabaci, the silverleaf whitefly. Greenhouse whiteflies have been known to infest soybean fields in Illinois for years, but they do not seem to cause any economic damage. So despite their noticeably large numbers in soybean fields in Illinois in 2007, it is unlikely that they represented a threat to soybean yields.--Kevin Steffey

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