Soybeans: Two-Spotted Spidermites (Tetranychus uricae)

Excerpt from Chapter 3, Field Crop Protection Guide, Order this publication

Table of Contents

1. Description
   • Integrated Pest Management Options
     • dimethoate – Cygon 4 E, Lagon 480 EC
2. Related links...

Description

The adult mite is barely visible to the naked eye, approx. 0.5-1.0 mm in length, rounded, eight-legged and yellowish-brown with two dark spots on the sides of the abdomen. The nymphs look like the adults but have six legs instead of eight. Two nymphal stages look similar to the adults, with four pairs of legs. Overwintering females are orange/red.

Image 1. Two-spotted spider mites are barely visible to the naked eye. Adults are eight-legged, yellowish-brown, with two dark spots.

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Integrated Pest Management Options

Scout fields around the first week of July. Infestations usually move in from edge of field as hot spots. Spot spray when populations average 4 mites per leaf. Do not use a pyrethroid insecticide (e.g., Matador) for the control of spidermites, as it will kill the beneficial mites and cause the spidermite populations to increase.

Comments
Do not feed or allow livestock to graze treated forage. No more than 2 applications per season. 30 days to harvest.

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Related links...

• Agronomy Guide for Field Crops - Publication 811
  • Soybeans: Two-Spotted Spider Mites
• Insects
• Soybeans

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