Soybean aphids were found in high numbers on buckthorn a couple of days ago in central Illinois. Buckthorn (Rhamnus cathartica) is the primary host for soybean aphid. Aphids go through a sexual phase of reproduction and deposit eggs nears the buds, which is how this pest overwinters. Even though it's not attacking soybean at this point in the season, is it still relevant to soybean aphid management? How could we use this information for the upcoming field season? Two points to anyone who can tell me how many aphids are on this ONE leaf! According to Dr. Dave Voegtlin, the researcher who took the above image, all the buckthorn leaves at this particular field site were covered with winged soybean aphids. For another extreme example of a dispersal flight, search Google images for "Aphids in Toronto".
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