Areca Tree Diseases — Symptoms, Photos, Treatment & Prevention

Cut a recently fallen or lesioned nut open — internal tissue shows browning/decay with a distinct odour. Confuse with: physiological nut shedding (no lesion) and pest-caused drop (look for insect feeding marks or frass rather than a water-soaked patch).

• Collect and destroy fallen/infected nuts to break the disease cycle
• Improve drainage in the plot — standing water favours this pathogen
• Thin dense canopy for better airflow around bunches

• Trichoderma-based basin/soil application as part of a preventive programme
• Field sanitation and removal of infected debris each season

• Drainage channels in low-lying plots before monsoon
• Avoid excess shade that keeps bunches persistently wet

• Bordeaux mixture (Copper sulphate + unslaked lime) — 1% (1kg copper sulphate + 1kg unslaked lime in 100L water). Spray on crown and bunches. Timing: At monsoon onset, repeated approx. every 45 days through the wet season.
• Prophylactic 1% Bordeaux mixture spray on crown and bunches at monsoon onset, repeated roughly every 45 days through the wet season (see dosage box). Still confirm the currently registered product and dose with your local Agriculture/Horticulture Department before spraying.

Rapid spread across many palms during prolonged rain, or if nut fall continues despite sanitation and spraying.

Gently tug the youngest spindle leaf — in bud rot it comes away easily with a rotten, foul-smelling base; a healthy spindle resists pulling. Confuse with: normal spindle senescence and nutrient-deficiency yellowing (neither has rot or smell), and rhinoceros beetle crown damage (look for beetle bore holes rather than rot — see the Pest Guide).

• Remove and destroy visibly rotten spindle tissue with a clean tool
• Treat the cut surface/crown with a copper-based fungicide paste
• Improve drainage so the crown does not hold standing water

• Trichoderma basin drench as part of a preventive programme

• Bordeaux mixture (Copper sulphate + unslaked lime) — 1%. Crown drench / spray, and as a paste on the cut surface after removing rotten tissue. Timing: Preventive at monsoon onset; curatively as soon as infection is confirmed.
• Crown drenching with 1% Bordeaux mixture is the long-standing preventive/curative approach (see dosage box); metalaxyl-based combination fungicides are also used against Phytophthora crown infections in some programmes. Confirm the currently registered product/dose for crown application with your local KVK — dosage guidance varies and must be current.

If the growing point has already collapsed, or the palm shows no new spindle growth after 2-3 months of treatment.

• Treat as an advanced/severe bud rot presentation — see the Bud Rot entry for management steps
• Get a field visit from a local extension officer to confirm whether recovery is realistic before investing further in that palm
• Improve drainage and remove severely collapsed palms to prevent the crown material from harbouring further infection

The bracket/conk fungus at the base is the definitive visual sign. Confuse with: ordinary old-age decline, nutrient deficiency and root grub damage (none of which produce a fungal bracket).

• Start root feeding + soil treatment (see dosage box) as early as possible — ICAR-CPCRI trials show disease index dropping from ~32% to ~17% in the first year of treatment, with recovery reported by year three in caught-early cases
• Remove and destroy palms that are already severely collapsed, along with as much of the root system as practical
• Avoid replanting the exact same spot immediately; improve drainage; avoid root injury during intercultural operations

• Trichoderma harzianum-enriched neem cake soil application (see dosage box) — the biological half of the ICAR-CPCRI combined programme

• Hexaconazole 5EC (Hexaconazole) — 1-2% solution, 100ml per palm. Root feeding (a small root is cut and the cut end placed in a solution-filled bottle/pouch tied to the palm). Timing: Quarterly, combined with soil incorporation of Trichoderma harzianum-enriched neem cake (2-5kg/palm) at 3-4 month intervals.
• Root feeding with Hexaconazole 5EC (see dosage box), combined with the Trichoderma neem cake treatment, is ICAR-CPCRI's documented combined programme — this is more hopeful than older guidance that assumed no treatment exists, but works best when started before the palm is severely collapsed.

Any suspected case — this disease benefits from field confirmation before removal or treatment decisions.

Scrape the bark at the bleeding site — decayed, discoloured tissue beneath confirms the disease. Confuse with: normal sap/resin from a minor fresh injury (no decay beneath), and red palm weevil infestation (foul-smelling ooze near the crown rather than the trunk — see the Pest Guide).

• Scrape out affected/decayed bark with a clean tool until healthy tissue is exposed
• Apply Bordeaux paste or copper oxychloride paste over the wound (see dosage box)
• Disinfect pruning tools between palms; avoid unnecessary trunk injury; control rats

• Bordeaux paste (thicker version of Bordeaux mixture) or copper oxychloride paste (Copper sulphate + lime (paste) / Copper oxychloride 50% WP) — Bordeaux paste ~1:1:10 (copper sulphate:lime:water by weight, thickened to paste); copper oxychloride paste approx. 3g mixed into a small quantity of water/linseed oil to form a spreadable paste. Apply directly over the scraped wound after removing decayed bark. Timing: Immediately after scraping; reapply if bleeding recurs.
• Bordeaux paste or copper oxychloride paste applied directly to the scraped wound (see dosage box) is standard practice for this and other palm trunk wound infections.

Distinguish from Mahali (which shows nut lesions, not just inflorescence-tip drying) and from pest damage (caterpillar webbing/frass present — see the Pest Guide).

• Remove and destroy dried inflorescence material (sanitation)
• Maintain balanced nutrition and avoid moisture stress during flowering
• Spray at the first sign of tip browning rather than waiting for spread (see dosage box)

• Carbendazim 12% + Mancozeb 63% WP (combination fungicide, e.g. Saaf) (Carbendazim + Mancozeb) — 0.25% (2.5g/litre of water). Foliar/inflorescence spray. Timing: At first sign of tip browning, repeat per label interval.
• A published field trial found 0.25% Carbendazim+Mancozeb combination fungicide significantly superior for controlling inflorescence dieback (see dosage box); plain Mancozeb or Carbendazim+Mancozeb at a lower rate is also documented as effective. Confirm the current registered product with your local KVK before spraying.

Discrete lesion pattern with defined margins, not accompanied by nut shedding or crown symptoms. Confuse with: nutrient-deficiency streaking (usually more uniform/marginal) and sun scorch (confined to the sun-facing side, no fungal texture).

• Remove and destroy severely affected fronds
• Improve canopy ventilation by avoiding overcrowded planting
• Maintain balanced potassium nutrition — susceptibility is often linked to K deficiency

• Copper oxychloride 50% WP (Copper oxychloride) — 0.3% (3g/litre of water). Foliar spray covering affected fronds. Timing: At first appearance of spots, repeat after 15-20 days in severe outbreaks.
• In severe outbreaks, a copper oxychloride 0.3% spray helps (see dosage box) — confirm the current product with your KVK.

• Prune and remove infected lower fronds and fallen debris that harbours the alga
• Improve airflow and reduce excess shade/humidity around affected palms — the alga thrives in consistently moist, still conditions
• A copper oxychloride or Bordeaux mixture spray can help in severe, persistent cases (see dosage box) — confirm current product locally

• Copper oxychloride 50% WP (Copper oxychloride) — 0.3% (3g/litre of water). Foliar spray. Timing: In severe cases only, once per outbreak.

• Identify and control the underlying sap-sucking insect (mealybug, scale, etc.) — sooty mould clears on its own once honeydew production stops
• Control ants, which protect these pest colonies from natural predators
• A mild soap-water wash on accessible parts can speed up visual clean-up but is cosmetic only
• Improve airflow/reduce overcrowding to discourage pest buildup

• No fungicide needed — this is a secondary symptom, not a primary disease; treat the underlying insect instead.

A slow, multi-year progressive decline pattern — not sudden. Rule out simple nutrient deficiency with a soil/leaf test, rule out root grub by checking the root system, and rule out water stress before concluding YLD. See the full Yellow Leaves comparison below.

• No chemical cure — focus on slowing progression and supporting overall palm health
• Balanced NPK plus micronutrients (magnesium, manganese) and organic manure
• Remove and replace severely affected, unproductive palms
• General IPM to manage sap-feeding insect populations that may act as vectors

• No chemical cure exists for the phytoplasma itself — chemical use here is limited to managing the sap-feeding insect vectors, see the Pest Guide.

• Use sterilised or solarised potting media
• Avoid overwatering and ensure adequate spacing between seedling bags
• Remove and destroy affected seedlings promptly to limit spread
• Avoid siting a new nursery on a plot with a recent history of seedling disease

• Trichoderma-enriched potting mix as a preventive biological treatment

• Copper oxychloride 50% WP (Copper oxychloride) — 0.3% (3g/litre of water). Soil drench around seedling collar. Timing: At first sign of collapse in the nursery bed/bags.
• A copper oxychloride 0.3% soil drench (see dosage box) can help at first sign of collapse — general nursery-hygiene practice, confirm current product locally.