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Two-spotted Spider Mites Persist in Soybeans

August 8, 2017
This agronomic image shows a two-spotted spider mite.

Despite recent rainfall, two-spotted spider mite (TSM) pressure continues in soybeans.

The Iowa University Extension recently received reports of high TSM numbers across several counties in southeast and south central Iowa.

The University of Delaware Extension says TSM populations have also withstood the recent rain events in the state.

When scouting for TSM, keep the following things in mind:

  • The pests gather underneath leaves.
  • Feeding leads to a speckled pattern on the upper leaf surface.
  • Severe damage leads to yellow or bronze areas in the field.
  • They typically move around field edges.

The University of Delaware Extension says preliminary results of Agri-Mek® SC insecticide show excellent control of TSM. Once TSM levels reach the state-determined economic threshold, we recommend applying Agri-Mek SC for extended residual control.

Agri-Mek SC can also be easily tank mixed with Endigo® ZC insecticide for control of soybean aphids, Japanese beetles, and stinkbugs.

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