Tomato

Identifying Pests During Seedling Growth

On this page
  • Cutworms
  • Damping-off
  • Darkling beetle
  • Garden symphylans
  • Green peach aphid
  • Flea beetle
  • Flea beetle damage
  • Wireworm

Check seedlings twice weekly for insects, and seedling disease. Blank spots in the field may be the result of cutworms, darkling beetles, flea beetles, damping-off diseases, and aphids. Use the photos below to identify seedling pests. Names link to information on identification and management.

Click on photos to enlarge

Cutworms
Cutworms
Identification tip: Cutworm larvae come in various colors and patterns, but always appear smooth skinned to the naked eye. Most species of cutworms reach 1 to 2 inches when fully grown. They usually curl up when disturbed.

Damping off
Damping-off
Identification tip: The taproot and lower stem are shriveled and darkened in seedlings affected by damping-off (right).

Darkling beetle
Darkling beetle
Identification tip: Darkling beetles are dull bluish black or brown beetles that chew off seedlings or feed on foliage. They can be distinguished from the predaceous ground beetles by the enlargement of the segments at the tip of the antennae.

Darkling beetle
Darkling beetle damage
Identification tip: Darkling beetles chew off the seedling near the soil line.

Something1
Garden symphylans damage
Identification tip: Garden symphylans may damage seedlings before or after emergence and may slow the growth of larger plants. Damage usually is concentrated in relatively small areas and recurs yearly.

Green peach aphid
Green peach aphid
Identification tip: Green peach aphid is dark green to yellow, with indefinite darker stripes on the abdomen, and no waxy bloom.

Flea beetle damage
Flea beetle
Identification tip: Flea beetles are tiny dark beetles with enlarged hind legs. They jump when disturbed.
Flea beetle damage
Flea beetle damage
Identification tip: The small pitting in the leaf surface of this seedling is typical of flea beetle damage.
Wireworm
Wireworm
Identification tip: Wireworms are shiny, slender, cylindrical, hard-bodied, wirelike, yellow-to-brown larvae. They feed on tomato seeds and burrow into seedling stems.

Statewide IPM Program, Agriculture and Natural Resources, University of California
All contents copyright © 2016 The Regents of the University of California. All rights reserved.

For noncommercial purposes only, any Web site may link directly to this page. FOR ALL OTHER USES or more information, read Legal Notices. Unfortunately, we cannot provide individual solutions to specific pest problems. See our Home page, or in the U.S., contact your local Cooperative Extension office for assistance.

Agriculture and Natural Resources, University of California

Accessibility   /PMG/C783/m783lpseedpest.html?srcPage=PMG%2FC783%2Fm783lpseedpest.html revised: June 24, 2016. Contact webmaster.