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🔍 Troubleshooting Guide
Something looks wrong with your aloe? Use these interactive decision trees to diagnose the problem and find the right action. Click through the questions to narrow down the cause.
Quick diagnosis severity guide
Click through the decision trees below — answer the questions to diagnose your problem and get specific action steps.
🟡 Yellowing leaves
Which leaves are turning yellow?
✅ Likely normal aging OR overwatering
If leaves are dry and papery: Normal aging. Remove the dry outer leaves. No action needed.
If leaves are soft, mushy, or have a sour smell: Overwatering / root rot beginning. Check soil moisture. Stop irrigation. Improve drainage. See Soft/collapsing base below. If severe, remove affected plants.
If yellowing started after heavy rain: Waterlogging. Dig drainage channels immediately. Raise beds if this recurs.
⚠️ Nutrient deficiency OR root damage
Check soil: Is it waterlogged? → Root rot. See Soft/collapsing base.
Check roots: Are they brown/black and mushy? → Root rot from overwatering or Phytophthora.
If roots are white and healthy: Likely nitrogen or iron deficiency. Apply balanced NPK top-dressing. If interveinal yellowing (green veins, yellow between), suspect iron or zinc deficiency — apply foliar spray of micronutrients.
If yellowing appeared after fertilising: Possible fertiliser burn. Flush soil with light irrigation.
⚠️ Nutrient deficiency — likely iron or zinc
Inner leaves yellowing while outer leaves stay green typically indicates iron chlorosis or zinc deficiency. Apply micronutrient foliar spray (Zn/Fe/B). Check soil pH — if below 6.0 or above 8.5, nutrient lockout may be the cause. Correct pH with lime (acidic) or gypsum (alkaline).
🟤 Soft / collapsing base
What does the plant base look and smell like?
🚨 Root / collar rot — advanced
This is likely Phytophthora, Pythium or bacterial soft rot (Erwinia). It is often fatal to the affected plant.
Immediate action:
- Uproot the affected plant and surrounding soil. Burn or remove far from the field.
- Stop all irrigation on the affected area.
- Drench neighbouring plants with a recommended fungicide (metalaxyl-based for Phytophthora, as per local guidance).
- Check drainage — this is almost always caused by waterlogging.
- Do not replant gaps until soil is dry and healthy.
See Diseases for detailed management.
✅ Likely old age or drought stress, not rot
Dry brown collapse at the base is usually an older leaf naturally senescing, or drought-stressed tissue. Remove the dead leaf. If the plant crown is firm and green, the plant is fine. If the crown also feels soft, monitor closely — rot may be starting. Check soil moisture.
⚠️ Early-stage root rot — act now
This is the critical window. The rot has started but hasn't reached the foul-smelling stage yet.
- Stop irrigation immediately.
- Check drainage channels — clear any blockages.
- If on flat ground, urgently build a raised bed or ridge around the affected area.
- Drench with recommended fungicide as a preventive.
- Monitor daily. If the plant recovers (new leaves emerging from centre within 2 weeks), it may survive. If it continues declining, remove it.
🔴 Galls & leaf distortion
Describe the abnormal growth:
🚨 Aloe gall mite (Eriophyes aloae) — "Aloe cancer"
This is the most feared aloe pest. The mite is microscopic and there is no chemical cure.
- Uproot and burn the affected plant immediately — do not compost, do not leave on the field.
- Inspect all surrounding plants for early galls — remove any at the first sign.
- Clean tools with disinfectant after handling galled plants (the mite spreads on sap).
- Check nearby ornamental aloes — they may be a reservoir.
- Source future planting material from mite-free nurseries only.
See Aloe gall mite for details.
⚠️ Mealybug infestation
White cottony clusters at leaf bases and in roots indicate mealybugs. They suck sap, secrete honeydew, and attract ants.
- Drench the crown and leaf bases with neem oil solution (follow local product guidance for concentration).
- For severe infestations, apply a recommended insecticide as per local guidance.
- Control ants — they farm mealybugs and spread them between plants.
- Remove and destroy heavily infested plants if drenching doesn't control them within 2 weeks.
✅ Likely edema (oedema) — physiological, not pest
Small corky bumps form when the plant takes up more water than it can transpire — common in cool, humid weather after overwatering. It is not a pest or disease.
- Reduce irrigation frequency.
- Improve airflow (wider spacing, remove surrounding weeds).
- No treatment needed — bumps may persist but the plant is not harmed.
🟤 Leaf spots
Describe the spots:
⚠️ Leaf spot disease (Alternaria / Cercospora / Colletotrichum)
Fungal leaf spots appear as brown-black lesions with yellow halos, often during wet, humid spells.
- Remove and destroy affected leaves (out of the field).
- Improve airflow — wider spacing, remove weeds, avoid overhead irrigation.
- If spreading, apply copper-based fungicide as per local guidance.
- Ensure drainage is working — wet conditions favour fungal spread.
✅ Aloe rust — usually cosmetic
Orange-brown powdery pustules (rust fungi) on older leaves are mostly cosmetic and rarely threaten the plant's health or commercial value.
- Remove the worst-affected leaves.
- Avoid dense, wet canopies — improve airflow.
- Fungicide only needed in severe commercial outbreaks.
✅ Normal — natural leaf patterning
Irregular white spots on young aloe leaves that fade as leaves mature are a natural characteristic of Aloe barbadensis Miller. This is not a disease. No action needed.
Caution: If spots persist on mature leaves and are accompanied by distortion, consider aloe mite (see Galls & distortion above).
📏 Poor growth / stunted plants
How old is the planting, and what symptoms do you see?
⚠️ Establishment failure — check these first
- Are roots present? Gently dig one failing plant. If roots are brown/black → rot. If roots are white but plant isn't growing → likely planting too deep or soil too compacted.
- Is the soil too wet or too dry? Check at 10 cm depth. Soggy → overwatering/drainage. Bone dry → underwatering during establishment.
- Were suckers too small? Very small offsets (<10 cm) establish slowly. Consider replacing with Grade A suckers.
- Was planting material healthy? If suckers came from a mite-infested field, they may carry mite even if they looked clean — inspect for early galls.
Gap-fill with healthy suckers. Ensure establishment irrigation is consistent (every 3–4 days in dry weather).
⚠️ Possible nutrient depletion, overcrowding, or root restriction
- When did you last fertilise? If it's been 6+ months, apply a top-dressing (NPK).
- Are clumps overcrowded? Dense clumps compete for resources and produce thin leaves. Lift excess suckers to thin the stand.
- Soil test: After 2–3 years, nutrients may be depleted, especially K and micronutrients. Test and amend.
- Has the field been waterlogged? Repeated waterlogging degrades soil structure and root health over time.
⚠️ Soil variability, nematodes, or localized root problems
- Map the stunted patches. Do they correspond to low spots (waterlogging), sandy patches (drought), or areas near old termite mounds?
- Dig roots in stunted plants. Poor, knotted, or absent roots suggest nematodes. Rotate with marigold before replanting.
- Soil test the stunted area separately from healthy areas — pH or nutrient differences may explain the pattern.
🍂 Leaf tip dieback
What do the dead tips look like?
✅ Wind burn or salt accumulation — cosmetic
Uniform tip drying across the field is usually caused by hot, desiccating winds or gradual salt accumulation in the soil. It is cosmetic — the leaf below is still good gel.
- In windy areas, consider windbreaks.
- If salt accumulation: flush soil with light irrigation periodically.
- Trim dead tips before harvest if the buyer prefers clean-cut leaves.
🚨 Frost / chilling injury
Water-soaked, glassy tissue that turns black indicates frost or cold damage. Aloe cannot tolerate temperatures below ~5 °C.
- Do not prune immediately — wait until weather warms to assess the extent of damage.
- If only leaf tips are damaged, the plant will recover. Trim dead tissue once new growth appears.
- If the crown is dead (soft and black at the base), the plant will not recover — remove and replant.
- Prevention: protect plants in frost-prone areas with straw mulch, row covers, or plant in frost-safe locations.
⚠️ Fertiliser / salt burn
Brown tips appearing within 1–2 weeks of fertilisation suggest too much fertiliser or too high concentration. Flush the soil with light irrigation to wash excess salts below the root zone.
- In future, apply fertiliser at lower rates and in split doses.
- Never apply fertiliser to dry soil — always irrigate first.
- Check water quality if using borewell water — high salt content can cause tip burn independently.
Environmental stress diagnosis
These flows cover abiotic (non-pest, non-disease) problems: frost damage, heat scorch, salt burn, wind damage, and flooding.
❄️ Frost damage diagnosis
⚠️ Moderate frost damage
What happened: Temperatures dropped below 0°C, causing ice crystal formation in leaf cells. Cell membranes ruptured, releasing cell contents (the translucent appearance).
Action: (1) Do NOT cut damaged leaves yet — let them dry naturally for 1–2 weeks. (2) Reduce irrigation (damaged tissue is prone to rot). (3) Apply copper-based fungicide to prevent secondary infection. (4) If crown is affected, cover with mulch/straw for warmth. (5) Harvest any intact inner leaves immediately.
ℹ️ Light frost — tip damage only
What happened: Brief cold exposure (2–5°C) scorched leaf tips but didn't penetrate the leaf body.
Action: No treatment needed — cosmetic damage only. Trim brown tips with clean scissors if aesthetic. Protect with frost cloth if more cold is expected.
🔥 Heat scorch diagnosis
🔥 Sun scorch
What happened: Intense solar radiation cooked the leaf surface, especially on south/west-facing surfaces in summer.
Action: (1) Install 30–50% shade net over affected area. (2) Increase irrigation by 30% during heatwave. (3) Apply white kaolin clay spray (5% solution) as a reflective sunscreen. (4) Mulch heavily (10+ cm) to keep roots cool.
🌡️ Heat stress / dehydration
What happened: Sustained temperatures above 40°C overwhelmed the plant's water balance. Leaf curling is a water-conservation response.
Action: (1) Irrigate immediately — deep soak, not light misting. (2) Apply mulch to reduce soil evaporation. (3) Increase irrigation frequency during heatwaves (daily if needed). (4) Avoid harvesting during heat stress — gel quality is poor.
🧂 Salt burn / salinity diagnosis
🧂 Salt accumulation
What happened: High salinity in soil or irrigation water. Aloe excretes excess salt through leaf tips — they burn first.
Action: (1) Test soil EC (electrical conductivity). If >4 dS/m, action needed. (2) Flush soil with 2–3 heavy irrigations (2x normal volume). (3) Switch to rainwater or low-TDS water source. (4) Apply gypsum (2 tonnes/acre) to displace sodium. (5) Mulch to reduce evaporation-driven salt rise.
ℹ️ Not salt burn
Alternative: Mid-leaf browning is more likely a fungal disease (leaf spot) or chemical burn from spray drift. Check leaf spot diagnosis above, or review recent spray records for phytotoxicity.
💨 Wind damage diagnosis
💨 Mechanical wind damage
What happened: Strong winds (especially dry hot winds or storms) physically tore or broke leaves. Plants blown flat may have shallow roots.
Action: (1) Install windbreaks: plant casuarina, neem, or vetiver on the windward side. (2) Stake or prop up flattened plants. (3) Trim torn leaves to reduce infection entry points — apply fungicide on cuts. (4) Increase mulch to improve root anchorage.
🌬️ Wind desiccation
What happened: Hot dry winds strip moisture from leaf surfaces faster than roots can supply it. Brown edges = windburn.
Action: (1) Windbreak planting is the long-term fix. (2) Short-term: increase irrigation during windy periods. (3) Mulch to maintain soil moisture. (4) Apply kaolin clay spray to reduce transpiration.
🌊 Flooding / waterlogging diagnosis
✅ Likely recoverable
What happened: Brief waterlogging suffocated roots temporarily. Aloe tolerates short flooding if drainage is restored quickly.
Action: (1) Improve drainage immediately — clear channels, dig relief trenches. (2) Do not irrigate for 3–5 days after water recedes. (3) Apply Trichoderma viride (5g/L) to prevent root rot. (4) Monitor for 2 weeks — watch for yellowing or foul smell at base.
⚠️ Root rot risk — urgent action
What happened: Prolonged waterlogging killed root tissue, creating anaerobic conditions that favour fungal pathogens (Fusarium, Pythium).
Action: (1) Drain all standing water immediately. (2) Dig drainage trenches between every 2 rows. (3) Apply metalaxyl + mancozeb drench (3g/L) around root zone. (4) If base smells rotten, dig up and inspect — remove dead plants, treat survivors. (5) Plan raised beds for next planting cycle. (6) Do NOT add fertiliser — plants can't absorb it with damaged roots.