Dwarf Burford Holly Leaf Spot in Extreme Heat

2 plants, 7 weeks in KS. 90–103°F, windy. One has black spots, drying leaves. Rain ~every 10 days, watered today.

Diagnosis: Leaf Spot Disease

Fungal leaf spot exacerbated by heat stress.

Management

1. Rake/destroy fallen leaves.
2. Fertilize with Holly-tone.
3. Fungicide: broad-spectrum (maneb, ferbam, copper/Bordeaux) — multiple applications.
4. Water every 3rd day, keep water off foliage.
5. Mulch 3" organic, not on trunk.

Expert insight provided by Steve.