Harmful Insects

Ash Plant Bug

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The ash plant bug is the most common insect species associated with shade and nursery trees in Minnesota. All types of ash trees are susceptible, however, this particular plant bug only attacks ash trees.

Ash plant bugs are sucking insects, which pierce plant tissues and feed on cell liquids. Their saliva is toxic to the plant cells, and a small area around the feeding puncture becomes bleached because of the destruction of chlorophyll. Light to moderate feeding causes yellow stippling and brown spotting of the leaves. Extensive feeding causes tissue death - brown curled areas on leaves that appear burned. To distinguish ash plant bug from various leaf diseases, look for the small varnish-like brown or black excrement spots (frass) left on the underside of leaves.

To learn more see the attached information sheet by clicking the PDF icon below.