Indian Hawthorn Leaf Spot and Chlorosis: Dual Diagnosis and Treatment

Indian hawthorn (Rhaphiolepis indica) showing both reddish leaf spots (Entomosporium/Cercospora) and distinct interveinal chlorosis (yellowing with green veins) requires a two-pronged treatment approach.

Diagnosis Breakdown

Leaf spots: Reddish-brown lesions, often with yellow halos—classic Entomosporium leaf spot, the most common Indian hawthorn disease. Spreads via splashing water; favored by wet conditions and overhead irrigation.

Chlorosis: Green veins with yellow interveinal tissue indicates iron/manganese deficiency—common in alkaline soils where these acid-loving plants struggle to absorb micronutrients.

Integrated Treatment Protocol

For Leaf Spot (Fungal)

• Sanitation: Remove ALL fallen leaves—bag and discard, never compost
• Fungicide: Chlorothalonil or propiconazole every 7-10 days for 3-4 applications
• Cultural: Switch to drip irrigation; improve air circulation via selective pruning
• Mulch: Fresh cypress mulch (2-3 inches) suppresses spore splash-back

For Chlorosis (Nutritional)

• Quick fix: Ironite (chelated iron) soil application per label
• Long-term: Soil acidification with elemental sulfur; acid-forming fertilizer
• Foliar: Chelated iron spray for rapid greening (supplemental, not curative)

Root/Crown Rot Risk Assessment

Indian hawthorns rarely develop crown/root rot unless in chronically waterlogged soil. Fungicide sprays for leaf spot also suppress soil pathogens. Monitor: if severely defoliated plants don't releaf after 2-3 fungicide cycles, replace individual plants rather than entire bed.

Variety Note

'Clara' and other resistant varieties show reduced susceptibility but aren't immune—especially under high disease pressure. Resistance ≠ immunity.