Soybean Aphid Update

August 5, 2009 at 8:15 am

In this week’s CORN Newsletter, OSU Entomologists Hammond, Michel and Eisley give a soybean aphid update. There is a general lack of sobyean aphids in Ohio. Further, I have yet to find any soybean aphids in Van Wert County. From the CORN Newsletter:

Last week we had the opportunity to check or get reports from numerous fields throughout Ohio on the situation with soybean aphids, and in general, the reports were about the relative lack of soybean aphids. However, late in the week, we got a report from Geauga County in northeast Ohio about fields having higher populations. A visit to that area this weekend supported those findings. We found numerous soybean fields that are nearly 100% infested. Numbers of soybean aphids per plant were not yet high, but nearly all plants had aphids, ranging from a few to 10-15 per plant. It was difficult to find a plant without aphids. Many of the soybeans in that area were later planted and are just now in growth stage R2. The Extension Educator from Geauga County, Les Ober, said that he is aware of one field that while not yet at threshold, will probably be within a week if the aphid population continues to grow. Thus, we would remind growers that we are not out of the woods yet when it comes to aphids. This is especially true for growers in north central and northeast OH, who should make an extra effort to sample their soybeans. If, and it is a big if, aphid populations starting doubling, these fields could be reaching threshold within next 1-2 weeks.

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Entry filed under: insects, soybeans. Tags: .

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