Do pine trees with pine cones that have dripping sap attract wasps? If so,...

Asked May 5, 2014, 9:30 AM EDT

Do pine trees with pine cones that have dripping sap attract wasps? If so, can a tree be sprayed to eliminate wasps?

Hennepin County Minnesota

1 Response

Please examine your tree for sap sucking critters like scales and aphids that produce a sugary excretion called honeydew. Scales and aphids can remove large quantities of sap that may cause wilting and dieback. You may also find a black, sooty mold feeding on the honeydew that may disfigure the appearance of tree and restrict photosynthesis. http://www.ext.colostate.edu/pubs/insect/05511.html http://www.extension.umn.edu/garden/insects/find/scales/#pine If you control the sap-sucking insects then the tree will no longer be attractive to the wasps. Some adult wasp feed on the honeydew or plant nectar. Wasps are considered beneficial insects because they are efficient predators of caterpillars. Wasps carry caterpillars back to their nest and feed them to their developing young. They help control pests like corn earworms, armyworms, loopers, and hornworms. Other parasitic wasps control scale or aphids.