Why are my pine trees dying?

Asked September 25, 2020, 6:10 PM EDT

Why are my pine trees dying? Earlier this year I had two pine trees die. The one next to them seems to be dying as well. Hoping you can tell me what might be killing them You can see their Pineneedles are turning brown. The two trees next to them or not

Howard County Maryland

1 Response

Evergreens such as pines can hide stress for a long time before they start to show symptoms. Usually these trees decline due to drought, poor drainage, soil compaction, poor soils, root competition for moisture and nutrients, etc. Here is more on these types of cultural/environmental problems. https://extension.umd.edu/hgic/topics/cultural-and-environmental-0
When stressed by the above conditions the trees are more susceptible to possible insect and disease problems such as borers. However, the borers are not the real reason for decline. They are secondary invaders. https://extension.umd.edu/hgic/topics/conifer-bark-beetles-trees-and-shrubs

There is not much to do other than keep the trees watered during dry periods. Keep the other pine healthy by watering during dry periods. No preventative sprays are recommended. Monitor for additional symptoms.

We recommend that you contact a certified arborist for an onsite diagnosis regarding the health of the pine tree and any other healthy pine trees. The arborist can diagnose problems including structural integrity of the trees, possible hazards, pruning, and the best way to proceed. http://www.treesaregood.org/
Here is our publication on white pine for more information https://extension.umd.edu/sites/extension.umd.edu/files/_images/programs/hgic/Publications/HG54_IPM_Series_Pine.pdf

Marian