Pine Trees Losing Needles?

Q:  I’ve noticed my pine trees are losing yellow needles.  Is this a symptom of a problem?

A:  Fall needle drop in conifers, where trees shed their older needles, is a common and natural phenomenon.  Many conifers, especially pines and spruces, will naturally shed older needles in late summer and fall. This typically involves the innermost or oldest needles, located towards the tree's center. This is a normal part of the tree's growth cycle.

Normal Needle Drop: Look for yellowing of the older needles before they fall off. The new growth at the tips of branches should remain green and healthy.

Problematic Needle Drop: If the needle drop involves more than just the older needles or affects the new growth, it could be a sign of stress or disease. Watch for yellowing or browning of new growth.  Presence of spots or lesions on the needles.  Dieback of branches or sections of the tree.

Common Causes of Problematic Needle Drop: 

Environmental stress including drought, too much water and extreme temperatures.

Pests: Insects such as spider mites, scale or aphids.

Diseases: Fungal diseases like needle cast or rust can cause abnormal needle drop. Symptoms might include discolored spots or patches on needles and premature needle shedding.

If you're unsure whether the needle drop is normal or if you observe symptoms of disease or pest infestation, consider consulting a local arborist or horticulturist. They can provide a more precise diagnosis and recommend specific treatments or interventions.