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Media Center

Photo LibraryInsects
Long-horned Beetle (Dectes)

The longhorned beetle or stem girdler, Dectes texanus (LeConte)
Scouting methods have not been developed for this pest, but adults are fairly easy to locate on the upper leaves of the sunflower plant. The adults have an extended emergence period and may be present in fields for many weeks. This has made chemical treatments for adults on soybean and sunflower impractical. Earlier research in the southern Plains showed that later planting dates may reduce sunflower infestations by this pest. When larvae are present in the stalks, plants do not always lodge. If field infestation is suspected, prompt harvesting may reduce losses from lodging. Also, lower plant populations that encourage thicker sunflower stems may reduce lodging.




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Adult Dectes

Name: Adult Dectes
Description: Adult Dectes texanus
ID Name: sun995nr
Credits: J.P. Michaud
Size: 239K

Adult Dectes

Name: Adult Dectes
Description: Adult Dectes on sunflower leaf. Photo taken in Colby, Kansas.
ID Name: sun071608a
Credits: Larry Charlet
Size: 141K

Adult Dectes

Name: Adult Dectes
Description: Adult Dectes on sunflower leaf. Photo taken in Colby, Kansas.
ID Name: sun071608b
Credits: Larry Charlet
Size: 186K

Dectes larva

Name: Dectes larva
Description: Dectes texanus larva
ID Name: sun994nr
Credits: J.P. Michaud
Size: 185K

Dectes larva

Name: Dectes larva
Description: Larva of Dectes texanus in stalk showing girdle and overwintering chamber.
ID Name: sun993nr
Credits: Larry Charlet
Size: 36K

Girdled stalk

Name: Girdled stalk
Description: Lodged stalk girdled by Dectes texanus.
ID Name: sun996nr
Credits: J.P. Michaud
Size: 64K


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