Kennett Township in Hockessin in New Castle County, Delaware — The American Northeast (Mid-Atlantic)
Sentinel Tree Planting
for Asian Longhorned Beetle (ALB)
Photographed by Pete Skillman, July 4, 2025
1. Sentinel Tree Planting Marker
The trees behind this sign were planted in 2015 as part of an effort to monitor the area for the presence of Asian longhorned beetle (ALB). Shantung maple (Acer truncatum) and a few Painted maple (Acer pictum subsp. mono) were selected due to their ability to lure ALB occurring in close proximity to them. ALB is not yet known to occur in Delaware as of 2019, however, future infestations may be detected much earlier through monitoring of these maples for signs of beetle attack. ALB is a serious threat to a variety of deciduous hardwoods in North America. If any signs of ALB are found, please call the ALB Hotline: 1-866-702-9938 or the Delaware Dept. of Agriculture at (302) 698-4500.
The following signs are indicative of ALB attack.
Frass Egg Deposition Site Oozing Sap Exit Holes
Erected by U.S. Department of Agriculture; Delaware Forest Service, Department of Agriculture.
Topics. This historical marker is listed in these topic lists: Animals • Environment • Horticulture & Forestry • Parks & Recreational Areas. A significant historical year for this entry is 2015.
Location. 39° 47.28′ N, 75° 42.015′ W.
this page online
Regionally, this marker is in Greater Wilmington and in Greater Philadelphia. It is also in the American Mid-Atlantic and on the Delmarva Peninsula. Globally, it is in the North Atlantic Region, North America, the Western Hemisphere, the Western World, and the Anglosphere. Historically, it finds itself in what was once New Netherland and also one of the original Thirteen Colonies.
Other nearby markers. At least 8 other markers are within walking distance of this marker: First African-American Schoolhouse In Hockessin (approx. 0.2 miles away); Chippey African Union Methodist Church (approx. Ό mile away); Hockessin School #107C (approx. Ό mile away); St. John The Evangelist Church (approx. 0.3 miles away); James Henry "Nip" Winters (approx. 0.4 miles away); Cox-Phillips-Mitchell Agricultural Complex (approx. half a mile away); Hockessin Friends Meetinghouse
Photographed by Pete Skillman, July 4, 2025
2. Sentinel Tree Planting Marker - wide view with trees
More about this marker. This sign serves as a historical marker because it shows how state and federal agencies have developed methods of monitoring and counteracting the environmental effects that invasive species have. This sign features one method used in 2015 using a holistic approach in a small park in suburban Northern Delaware.
Also see . . . AsianLonghornBeetle.com. This USDA website is mentioned on the marker and gives more information about the Asian Longhorn Beetle. (Submitted on July 5, 2025, by Pete Skillman of Townsend, Delaware.)
Credits. This page was last revised on July 5, 2025. It was originally submitted on July 5, 2025, by Pete Skillman of Townsend, Delaware. This page has been viewed 103 times since then and 11 times this year. Photos: 1, 2. submitted on July 5, 2025, by Pete Skillman of Townsend, Delaware.
