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Integrated Pest Management Program

Department of Plant Science and Landscape Architecture, Department of Extension

Pest Messages > Greenhouse

Fungus Gnats, Midges and Moth flies on Yellow Sticky Cards, April 6, 2013

Leanne Pundt, Extension Educator, Greenhouse IPM 

  • Aphids – isolated hot spots of aphids are appearing on some of their favorite hosts such as million belles or calibrachoa, as well as weeds.  
  • Thrips- with the warmer temperatures I am starting to see more feeding damage on gerbera daisies, Ipomoea, and Dahlietta. 
  • Botrytis – including some stem cankers on wounded plants, may be especially problematic in your damper houses. See Message of last week (March 17th) for some ideas on Botrytis management.

In damp houses, you may occasionally see small flying insects that are easily confused with fungus gnats on your sticky cards. 


Midges are small, delicate mosquito like insects they may occur in swarms. Males have very plumose or feathery antennae, which you can see. Their larvae are aquatic, a few occur in decaying matter, or in moist ground. Most are scavengers. They are not plant pests.

Another insect that may be found in damp greenhouses is the moth fly.

Photo From: e

Moth flies are also called drain flies. Adults appear grayish or dark because of the many fine hairs covering their wings and body. They are primarily a nuisance and are not a plant pest.

If you are seeing unusual insects in your greenhouses or gardens, a good website for identification is “ “