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


Shaun Haney

Shaun grew up on a family seed farm in Southern Alberta. Haney Farms produces, conditions and retails wheat, barley, canola and corn seed. Shaun Haney is the founder of @shaunhaney


Wheat Pete’s Word, Oct 18: Cutting hay, calibrating monitors and harvesting corn

In this episode of The Word, host Peter Johnson takes us through this week's crop notes, and questions around cereals, hay, weed control and poor crops. Have a question you’d like Johnson to address? Or some yield results to send in? Leave him a message at 1-844-540-2014, send him a tweet (@wheatpete), or email him…Read more »


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