Photinia (Red Tip) Entomosporium Leaf Spot: Severe Disease Management

Barbara in SW Missouri: 3-year-old, 5-ft red tips had Entomosporium leaf spot spring. Fungicide worked on new growth. Lower half defoliated. Asks about severe fall pruning (to ground or 3 ft).

Expert Response

Steve (Arkansas) knows this disease well—most important on Photinia in region. So bad they no longer recommend planting it.

Critical Pruning Timing

• Red spring leaves most susceptible
• Prune so tender leaves absent during fungus activity (March-June in region)
• Provided PDF bulletin (FSA-6112)

Follow-Up Clarification

Barbara: mature leaves got spot, not new red shoots. Sprayed, new growth clean. Wants to prune to ground for restart. Asks about pruning unaffected nearby red tips for uniformity.

Expert Correction

Steve: "Prune to ground" was sarcasm—disease can get so bad removal is best. Don't kill plants intentionally. Infection may start on tender leaves but show later. Nearby unaffected plants: don't prune severely unless diseased.

Key Insight

Entomosporium is so devastating in this region that species replacement is often wiser than intensive management. Pruning timing is critical for susceptible tissue protection.