Soybean Aphids - What is the Threshold Again?


It has been a few years for some since they have had to worry about soybean aphids, let alone make a spray decision. So I want to cover off the key points you need to know through some of the repeat questions that have been coming in. Anyone with more questions after reading this, please ask in the comment sections so we can all continue the discussion there.

Q1. With soybeans at $15, does that threshold change? Answer: No. The economic threshold of “250 aphids per plant and increasing on 80% of the plants in the field during R1-R5?, already takes into consideration a wide range of soybean prices. The actual economic injury level (where the cost of control is equal to the damage they are causing) is around 660 aphids per plant. So you have a large buffer area between the threshold and the economic injury level to determine if a spray is needed. SEE THE REST OF THE POST

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