How to Manage Pests

Pests in Gardens and Landscapes

Treehoppers

Treehopper adults are commonly greenish to brown and 0.5-inch long or shorter. They have an expanded hood covering the body, which may be formed into hornlike projections. Nymphs have numerous spines on the back of the abdomen, and both immatures and adults jump readily.

Identification of species

Damage

Treehoppers suck plant juices. This feeding damage is slight, although the honeydew produced by treehoppers supports the growth of sooty mold, which may blacken leaves and twigs when treehoppers become numerous. Treehoppers injure plants primarily by making numerous small slits or crescentlike punctures in bark where they lay their eggs. These egg punctures cause bark to appear roughened, and twigs may die back.

Solutions

If treehopper populations were high on deciduous trees the previous season and damage cannot be tolerated, narrow-range oil can be applied during the dormant season to kill overwintering eggs. To control species known to feed on many different plants, removing some of these alternate hosts may reduce treehopper populations feeding on more valued plants. High populations of nymphs and adults may be reduced by spraying exposed insects with insecticidal soap or narrow-range oil.

 

 

Oal treehopper adults on coast live oak
Oak treehopper adults on coast live oak

 

 


Statewide IPM Program, Agriculture and Natural Resources, University of California
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