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Soybean Aphids Reach Threshold in Red River Valley

Some fields have heavy populations, says U of M entomologist.

Soybean aphids in the Red River Valley are continuing to  increase and several local fields have reached threshold for spraying says Ian McRae, University of Minnesota Extension entomologist, Crookston.


"The warm daytime and mild night temperatures this week are good conditions for aphid reproduction.  Add to that, we've been noticing a lot of winged aphids in the fields which appear to be recent arrivals rather than local populations developing wings  Add it together and we get increasing aphid populations," he says.


Not all fields in the Valley will require treatment though,


"I've seen clean fields neighboring ones with heavy populations.  So be sure to scout and make field by field decisions."


Extension entomologists in the region spraying when there is an average of 250 aphids per plant and 80% of the plants having at least some aphids. 


Source: U of M

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