The needles on pine trees turn brown for a variety of reasons, most often including root death or damage, dehydration, fungal diseases and bark beetle infestation. Unfortunately there is little in the way of remedy where dead roots or bark beetles are concerned. On the positive side, there are treatments for common pine tree fungal diseases as well as procedures to help reverse some root damage and dehydration.Continue Reading
Pine trees with pitch flowing in large quantities from the trunk, holes in the bark and small piles of sawdust surrounding the base are likely under attack by bark beetles. These insects tend to target older or distressed trees. They may have damaged a tree beyond repair without it being obvious to the human eye, as a dead pine tree can remain green for some time before abruptly turning brown.
The most common cause of root damage is a result of freezing. Symptoms include flecks of brown appearing on the tree's needles and dieback, which is when new needles begin to die from their tips backwards. All species of pine trees are susceptible to temperature-related root damage, but young trees are particularly vulnerable to the condition.
Tree experts recommend planting pines in soil with excellent drainage, as well as watering the trees in the fall.Learn more about Trees & Bushes
Bark beetles kill pine trees by keeping nutrients from traveling from leaves to the rest of the tree and by keeping water from coming upward from the root systems to the leaves. Dehydration and malnutrition combine to damage and kill the trees in which these beetles establish colonies.Full Answer >
The needles on a dwarf Alberta spruce may turn brown for a number of reasons such as spider mite infestation, cytospora canker fungal disease, rhizosphaera and stigmina. Environmental stress due to air pollution, poor soil, winter salt spray, heat or high light reflection can stress a plant and cause brown needles. Lack of proper air circulation and water, especially during periods of drought, may also cause needles to dry. The shrub is resilient and typically recovers with proper care.Full Answer >
New pine needles are produced every spring and summer and the older, less efficient needles turn brown and drop off. New needles last for approximately 4 years, and as the tree grows the new needles are located at the branch ends.Full Answer >
When buying fresh-cut pine trees for Christmas, select one that is recently harvested, which is characterized by bright and vibrant-colored needles. Dull and brittle pine needles that break easily are indications of dehydration and age. Check if the tree retains the majority of its needles when shaken.Full Answer >