NDSU Extension - Ramsey County


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July 11, 2011 Agriculture Column


Soybean aphid populations have increased very quickly in some fields in NW and west central MN over the past week with some fields having already gone over threshold. In their natural obstinacy, however, soybean aphids have neglected to infest all fields in the region making it necessary to scout individual fields to determine if they're over threshold (or even if they have aphids!). Field in those areas have seen populations exploding in one field and a half mile down the road nothing.  Many scouts in the NW and Central Minnesota are saying this is the fastest they have ever witnessed soybean aphid populations increase since we started growing soybeans.

The scouts are seeing very few predators in the soybean fields, likely due to the influx of apids appearing earlier in small grain fields.  The aphids are causing the predator population to congregate in the small grain fields.  The good thing is the aphid population in the small grains should end much earlier thus creating a predator move to other areas.  This does not mean, however that you should not be scouting the soybean fields for aphids and that the predator will take care of any problem.  This is only one tool that helps, not eliminate the problem.  Remembering spraying soybean aphids below the threshold of 250 aphids per plant will also eliminate any predator population present.  The population would also be lowered if conditions would dry out as the population thrives on higher moisture areas.  The key to soybean aphid is to scout, scout and keep scouting.

Project Safe Send!!!

Project Safe Send is the perfect opportunity for you to dispose of any unused, outdated or off label pesticide no longer allowable.  This opportunity is for not just farmers but also for any homeowner that may have pesticides to dispose of.  The nearest location for Devils Lake is in Devils Lake, on July 18.  This is on Monday of next week.  This location will be 1905 Schwan Ave. NW or 2.5 miles west of Devils Lake Industrial Park, south side of US 2.


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