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Flatheaded borer (Buprestidae) adults are usually bright colored metallic beetles just under 1 inch long. Larvae do not have legs and have obviously enlarged segments toward the head (the flathead look). Roundheaded borer (Cerambycidae) adults are fairly large, from 0.5 to 2 inches and have very long antennae – often longer than the body.

Larvae of both borers tunnel under tree bark, usually in the wood layer. Flatheaded borer galleries are tightly packed with very fine dust, whereas galleries of roundheaded borers contain coarser material. Exit holes of flatheaded borers tend to be flattened or oval and roundheaded borer exit holes tend to be more rounded.

Both borer types tend to attack weakened – or even recently dead – trees, but some flatheaded borers (e.g. emerald ash borer) will attack apparently healthy trees.

Most of these borers have one generation per year, but some have more than one generation per year, and others have a multi year life cycle.

Discus™ – Nursery Insecticide
Systemic applications must be made before trees become infested for best results. Apply 3.4 to 5.6 fluid ounces per 1000 ft2 as a banded spray to the soil surface, followed by irrigation or rainfall to move the active ingredient to the root zone; OR apply .75–1.5 fluid ounces per inch of trunk diameter (at breast height) or per foot of shrub height. Use a minimum of 10 gallons of water per 1000 ft2 as a drench. Apply in early spring or in the autumn.

Marathon® II – Systemic and Translaminar Insecticide
Systemic applications must be made before trees become infested for best results. Apply 0.1–0.2 fluid ounces per inch of trunk diameter (at breast height) or per foot of shrub height. Use a minimum of 10 gallons of water per 1000 ft2 as a drench. Apply in early spring or in the autumn. Shake well before use.

Marathon® 60WP – Systemic Insecticide
Systemic applications must be made before trees become infested for best results. Apply one 20 gram packet per 8 to 16 inches of cumulative trunk diameter (at breast height) or per 8 to 16 feet of cumulative shrub height. Use a minimum of 10 gallons of water per 1000 ft2 as a drench. Apply in early spring or in the autumn.