Potted Dwarf Alberta Spruce: Mite Damage and Overfertilizing

Diagnosis: Spruce Spider Mites

Brown patches on container-grown spruce in hot, dry Memphis suggest spruce spider mites. Containers stress plants, and monthly fertilizing exacerbates susceptibility.

Confirming Mites

1. Hold white paper under affected branches.
2. Tap branches sharply.
3. Look for tiny red/black moving dots (mites).

Treatment

• Apply registered miticide per label.
• Stop monthly fertilizing. Feed once in spring, once in fall max.
• Water when top 2 inches of soil dry.
• Ensure pot drains freely.

Prevention

Mites thrive on stressed, overfertilized plants. Healthy cultural practices are the best defense.