Tuesday, August 11, 2015

Take advantage of window to control weeds following small grains harvest

Figure 1. Weed flush after small grains harvest
by Dr. Tom Peters, Extension Sugarbeet Agronomist, Dave Nicolai and Doug Holen, Extension Crop Educators

Recent travel across Minnesota highlights that it is small grains harvest time. Thrashed fields have a clean look, especially from the highway. However, closer examination reveals a great number of weeds, especially waterhemp, emerging from the stubble. More swathing due to uneven harvest maturity and significant lodging resulted in weeds getting a head start this season.

What to consider when treating a soybean field more than once for soybean aphid

by Robert Koch (Extension Entomologist), Bruce Potter (IPM Specialist), Ian MacRae (Extension Entomologist), and Ken Ostlie (Extension Entomologist) 

A number of fields in southwestern Minnesota have reported unexplained failure (poor performance) of recent insecticide treatments and will require additional applications to control existing populations.

If a field needs to be treated more than once in the same year, remember the potential for development of insecticide resistance (U of MN fact sheet on insecticide resistance). Do not reapply the same insecticide mode of action (insecticide group).