Whiteflies are tiny white flies and powdery wings that are common pests of greenhouse plants. They are minor pests on soybeans that can be confused with soybean aphids. Be sure you can distinguish between the two insects.
Soybean Cyst Nematode Testing for Resistant Populations
How the soybean cyst nematode SCN problem evolved
Iowa State nematologist Greg Tylka talks about SCN