Soybeans: Two-Spotted Spidermites (Tetranychus uricae)

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Pub 812: Field Crop Protection Guide > Pub 812: Soybeans > Two-Spotted Spider Mites

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Field Crop Protection Guide 2011-2012, Order 2011-2012 publication

Table of Contents

1. Description
2. Integrated Pest Management Options

• dimethoate - Cygon 480 EC, Lagon 480 EC

3. 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.

Active ingredient	dimethoate
Trade name	Cygon 480 EC
Rate per hectare (product)	1 L per ha
Rate per acre (product)	400 mL per ac
PHI*	30
Comments	Ground and aerial application. Use sufficient water volume to ensure good coverage. Maximum 2 applications/yr.

 

Active ingredient	dimethoate
Trade name	Lagon 480 EC
Rate per hectare (product)	1 L per ha
Rate per acre (product)	400 mL per ac
PHI*	30
Comments	Ground and aerial application. Use sufficient water volume to ensure good coverage. Maximum 2 applications/yr.

 

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Related links...

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