Diagnosing Arborvitae Decline from Overwatering and Lawn Fungal Issues

Newly planted arborvitae turning gray and dying, combined with mysterious yellow-to-gray lawn spots, point to two separate but manageable problems.

Arborvitae: Classic Overwatering Symptoms

Graying foliage in arborvitae is a hallmark of root suffocation from excess moisture. Despite good intentions, frequent watering plus heavy rainfall creates waterlogged conditions.

Corrective actions:

• Reduce watering to once or twice weekly, adjusting for rainfall.
• Check drainage — water should not stand around root zones.
• Apply granular fertilizer to strengthen stressed plants.
• Ensure planting depth is correct (root flare visible at soil surface).

Lawn Spots: Likely Dollar Spot Fungus

The yellow-to-gray spots appearing in multiple yards suggest dollar spot (Clarireedia jacksonii), a common fungal disease favored by warm days, cool nights, and excess moisture.

• Improve air circulation and reduce thatch.
• Water deeply but infrequently (early morning only).
• Apply nitrogen fertilizer to help grass outgrow the disease.
• Fungicide treatment if severe (propiconazole, myclobutanil).

Correcting irrigation practices addresses both issues simultaneously — healthier trees and disease-resistant turf.