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Home » Spider mites active on vegetables
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Spider mites active on vegetables

Symptoms include stippling of leaves, webbing, and minute flecking on surfaces of fruit

PUBLISHED ON September 7, 2017

Figure 2. Notice the webbing near the stem of the fruit and the gold flecking of the surface. (Photo: Ric Bessin, UK)
Figure 2. Notice the webbing near the stem of the fruit and the gold flecking of the surface. (Photo: Ric Bessin, UK)
Figure 2. Notice the webbing near the stem of the fruit and the gold flecking of the surface. (Photo: Ric Bessin, UK)

LEXINGTON, Ky. — The hot, dry conditions we experienced earlier this month have brought on two-spotted spider mite problems in some areas. Unlike many insect problems, we are alerted to mite infestations by the symptoms of their damage rather than seeing the mites themselves. Common symptoms of spider mite damage include stippling of leaves, webbing, and minute flecking on surfaces of harvested fruit.

Figure 1. Stippling of leaves is often the first sign of spider mites. (Photo: Ric Bessin, UK)
Figure 1. Stippling of leaves is often the first sign of spider mites. (Photo: Ric Bessin, UK)

Symptoms

Stippling consists of small light-colored spots in the leaves. These are often grouped in small patches when spider mite populations are low and can cover large portions of the plant when infestations are high. Spider mites can produce silk, which gives rise to their name ‘spider’ mites. This webbing isn’t noticeable when populations are low, but as mites increase in number, webbing may be seen between leaf petioles and stems or leaflets. Mites feeding on fruit with their piercing sucking mouthparts cause similar stippling, which is sometimes referred to as gold flecking on tomatoes.

Management

When spider mite problems need to be controlled midseason, I generally recommend only miticides that provide high levels of control (see the efficacy table chart in the back cover of Vegetable Production Guide for Commercial Growers, ID-36). Situations closer to harvest may be managed with products providing only temporary relief.

Click here to visit the University of Kentucky Pest News blog. 

— Ric Bessin, University of Kentucky Extension Entomologist

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“I do have great respect and appreciation for what you do,” the Governor told the room filled with commodity group representatives, agribusiness leaders, and agriculture educators. “I’m grateful to live in a state where so much of what we are blessed to be able to eat is grown right here.”

Governor addresses Ag Council

Angela Wei, a UK College of Agriculture, Food and Environment senior, majoring in  agricultural and medical biotechnology and mathematics senior from Lexington, was one of five students across the country selected to participate in the 2017 Dartmouth MD/PhD Undergraduate Summer Fellowship Program. (PHOTO: provided by UK Public Relations)

UK ag biotech student chosen for fellowship

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