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How to Manage Pests

Pests in Gardens and Landscapes

Leafhoppers

Leafhoppers are sucking insects in the family Cicadellidae. A few species of leafhoppers suck the juice from many landscape plants, but most kinds feed on only one or several closely related plant species. Most leafhoppers are slender, wedge-shaped, less than 0.25 inch long as adults, and generally are varying shades of green, yellow, or brown and often mottled. They walk rapidly sideways or readily jump when disturbed. Adults and nymphs and their pale cast skins are usually found on the underside of leaves.

Identification of species | Life cycle

Damage

Leaves appear stippled, pale, or brown, and shoots may curl and die. Some leafhopper species transmit plant diseases, but this is troublesome mostly among herbaceous crop plants. A few species secrete honeydew on which foliage-blackening sooty mold grows.

Solutions

Ignore these insects as they rarely if ever cause serious harm to woody plants. Insecticidal soap or narrow-range oil can be applied to infested foliage to reduce high populations of leafhopper nymphs; thorough coverage of leaf undersides is important. It is very difficult to control adults effectively and no control is recommended.

An adult leafhopper on Myoporum
An adult leafhopper on Myoporum

Adult rose leafhopper
An adult rose leafhopper

White speckled markings left by leafhoppersWhite speckled markings left by leafhoppers


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