White Pine Decline: How Landscape Fabric Can Cause Needle Drop and Browning

The Problem with Landscape Fabric

Landscape fabric (weed barrier) placed under mulch can shed water, preventing rainfall and irrigation from reaching tree roots. Over time, this leads to chronic drought stress, causing needle browning and premature needle drop.

Other Possible Causes

• Insect pests like pine sawfly or adelgids.
• Fungal diseases such as needle cast or root rot.
• Soil compaction or grade changes.

Recommended Actions

1. Remove the landscape fabric immediately.
2. Water deeply once a week during dry periods.
3. Apply 2-3 inches of organic mulch (wood chips) directly on soil.
4. Consult a certified arborist for pest/disease diagnosis.