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Twolined Chestnut Borer

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Twolined Chestnut Borer


Twolined chestnut borer, Agrilus bilineatus, is native to the eastern half of the United States. Adults are slender, 5 mm to 13 mm long beetles with two light stripes on their front wings. Branch dieback and discolored and sparse vegetation are damage symptoms.


Twolined Chestnut Borer

Twolined Chestnut Borer

Life Cycle: Adults begin to emerge in early June from characteristic D-shaped exit holes in the bark. Eggs are deposited in late June and early July. Larvae consume phloem and scar the xylem, while excavating mines in the trunk and larger branches. Feeding begins in the tops of trees and working down. Adults may be present into September, feeding on foliage of hardwood trees. There is one generation a year, but some larvae may require two years to complete their life cycle.


DAMAGE Trees exhibit sparse foliage, chlorotic leaves and dieback. D-shaped exit holes (about 1/8 inch in diameter) may be visible in the upper part of the tree. Long, winding galleries packed with frass can be found under the bark in areas where larvae are to injury. Help keep trees healthy through proper site selection and watering; protect from construction injury. Once injury occurs, damage may be pruned out if it isn’t too extensive.


Twolined Chestnut Borer

Twolined Chestnut Borer


Managment: two-lined chestnut borer is prevention. Healthy, non-stressed trees will not attract two-lined chestnut borer adults, and vigorous trees are able to fight off invading borers. Water oaks during dry periods to minimize drought stress. Avoid compacting soil, or changing the soil grade or water drainage pattern during construction.


Avoid damaging the bark; or allowing significant defoliation by insects such as gypsy moth, canker worm, or forest tent caterpillar. Remove and dispose of any two-lined chestnut borer-infested wood before beetles emerge in mid-May. Cover all oak woodpiles with plastic tarps from mid-May through mid-July to limit borer movement. Systemic insecticides that are applied to trees by drenching or injection.


Twolined Chestnut Borer Damage

Twolined Chestnut Borer Damage

If you ever have any bug related issues in New York City, feel free to call us either at Beyond Pest Control. Once again, and I can't stress this enough we are on call twenty four hours a day seven days a week to kill those bugs, we aren’t kidding whether you call us at 9 am or midnight we will be available to take your call and either get rid of the bug infestation, or answer any questions you may have concerning the bug issue. I can honestly guarantee that there will be someone to answer that call. We make it our business to make you bug free!


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Beyond Environmental P.C.

Our pest control specialists service NYC & NJ and all boroughs including Queens, Brooklyn, Bronx, Manhattan, Long Island, Suffolk County, Nassau Country & Staten Island, Westchester County & Rockland County, Hudson County in New Jersey including Jersey City, West New York, Union City, Hoboken, Bayonne.

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