Unfortunately, I have no idea what insect you are referencing.  There are many products available for controlling wasps at box stores and garden centers that work very well.  Please send additional information, a picture, or bring a sample into the cooperative extension office (best option) on Wyoming Road.

the above was posted  by the original author

repeated below

http://www.na.fs.fed.us/spfo/pubs/pest_al/sirex_woodwasp/sirex_woodwasp.htm

Unfortunately, this insect has not been officially found in Delaware and since there is a claim for one to be in Delaware, I need to see a sample of the insect before recommendations should be made. I also need to have additional information about the situation and documented evidence of the insect. What is the host plant (genus, species)? Plant location? How long has it been there? What are the soil characteristics? Why do you think it is this species? There are many species of wasps in this area that can be found on or around pines. As per the site you sent, please see my snippet which should be attached.

Attached find photos of wasps and trees. The trees are located in Delaware (Middletown) and were planted in 2010, 2011, and 2012 as small 3 to 6" seedlings. These trees were taken from my mom's house in Crisfield, Maryland,  during the two years after she died in 2010. They are planted in a typical Middletown old farmers' field "planted" with houses.

Those are very beneficial wasps. They are parasitoids called scoliids that attack white grubs. The white grubs they attack are green June beetles. This white grub is frequently found in soils high in organic matter. The wasp buzzes over the turf until it detects the larva, and then it digs into the soil to attack. They lay eggs on the white grub, and these hatch into immature wasps which eat the grub. The adults are very common this time of year, and are most frequently found on flowers gathering nectar as their food. They do no damage to trees and are probably resting. They are considered a non-aggressive wasp because generally they will not sting or go after people, but the females can sting if handled.

Thanks brian

to me they looked the ones in the article

No worries.  I did some work with the scoliids while working on my Masters in Kentucky.  Very cool, but wanted to sting me while handling them.  Thank goodness for packing foam.  We used the foam to hold the wasp without injuring the insect.