Curry leaf

Common pests and diseases, how to spot them, and what to do first.

How urgent: Keep an eye on itAct todayUrgent: ask a plant expert

1. Leaf spot and fungal diseasesKeep an eye on it

   How to identify

   • Circular brown or black spots on leaves, sometimes with yellow halo
   • Spots may merge, causing leaf yellowing and drop
   • White or gray powdery coating (powdery mildew)
   • Occurs mainly during humid monsoon weather

   Likely cause

   Fungal infection favored by high humidity, poor air circulation, overhead watering, and waterlogged soil.

   What to do now

   1. Remove and destroy all affected leaves immediately
   2. Improve air flow by thinning overcrowded branches
   3. Stop overhead watering; water at base only, early morning
   4. Spray with diluted neem oil (5 ml per liter water) or a baking soda solution (1 teaspoon per liter) weekly for 3 weeks
   5. For severe cases, apply copper-based organic fungicide as per label directions

   Prevention

   • Ensure excellent drainage and avoid waterlogging
   • Space plants adequately for air circulation
   • Water at base in morning; avoid wetting foliage
   • Apply neem oil spray monthly during monsoon as preventive
2. Aphids and scale insectsAct today

   How to identify

   • Small green, black, or brown insects clustered on new shoots, buds, and leaf undersides
   • Sticky honeydew on leaves; sooty black mold may follow
   • Curled, distorted, or yellowing young leaves
   • Stunted growth

   Likely cause

   Sap-sucking insect pests, often appear during warm weather and on stressed or over-fertilized plants.

   What to do now

   1. Spray strong jet of water to dislodge aphids or scale
   2. Apply neem oil spray (5 ml per liter) or insecticidal soap, covering undersides of leaves thoroughly
   3. Repeat spray every 5–7 days for 2–3 weeks
   4. Introduce natural predators like ladybugs if available
   5. For heavy scale, wipe off manually with cotton swab dipped in diluted rubbing alcohol

   Prevention

   • Inspect plants weekly, especially new growth
   • Avoid excess nitrogen fertilizer which attracts aphids
   • Spray neem oil or garlic spray fortnightly as preventive
   • Encourage beneficial insects by planting marigolds, coriander nearby
3. Leaf yellowing and dropKeep an eye on it

   How to identify

   • Lower or older leaves turning yellow then dropping
   • Overall pale or lime-green foliage instead of dark green
   • Weak, slow growth
   • May see yellowing between veins (chlorosis)

   Likely cause

   Usually caused by nutrient deficiency (nitrogen, iron, magnesium), overwatering, root rot, or natural aging of older leaves.

   What to do now

   1. Check soil moisture—if soggy, reduce watering and improve drainage immediately
   2. If soil is dry and compacted, water thoroughly and mulch
   3. Apply balanced organic fertilizer or compost to boost nutrients
   4. For iron deficiency (yellow leaves with green veins), spray with chelated iron or water with Epsom salt solution (1 tablespoon per 4 liters)
   5. If root rot suspected, ease plant from pot, trim black mushy roots, repot in fresh well-draining soil

   Prevention

   • Water moderately; let top 2–3 cm of soil dry between waterings
   • Use well-draining soil and pots with drainage holes
   • Feed regularly during growing season with compost or organic fertilizer
   • Some yellowing of oldest leaves is normal and harmless
4. Root rotUrgent: ask a plant expert

   How to identify

   • Wilting despite wet soil
   • Yellowing leaves, stunted growth
   • Foul smell from soil or base of plant
   • Black, mushy roots when plant is lifted

   Likely cause

   Caused by waterlogging and poor drainage, allowing root-rotting fungi (Pythium, Phytophthora) to attack roots.

   What to do now

   1. Stop watering immediately
   2. Carefully remove plant from pot or ground
   3. Wash roots gently, cut away all black, soft, or foul-smelling roots with clean, sharp scissors
   4. Repot in fresh, well-draining mix (sand, perlite, compost)
   5. Water sparingly until new growth appears; place in bright indirect light
   6. Severely affected plants may not recover

   Prevention

   • Always use pots with drainage holes
   • Use well-draining soil mix; add sand or perlite if needed
   • Never let plants sit in waterlogged soil or saucers of water
   • Water only when top soil is dry to touch
5. Caterpillar and leaf-eating pestsAct today

   How to identify

   • Irregular holes or notches chewed in leaves
   • Visible caterpillars or larvae on leaves or stems
   • Droppings (frass) on leaves or ground below
   • Severe defoliation in bad infestations

   Likely cause

   Caterpillars of moths and butterflies, beetle larvae, or grasshoppers feeding on tender foliage.

   What to do now

   1. Handpick and remove caterpillars and drop in soapy water
   2. Spray with Bacillus thuringiensis (Bt), an organic bacterial pesticide safe for curry leaves
   3. Apply neem oil spray to deter feeding
   4. For severe cases, dust with wood ash or diatomaceous earth around plant base

   Prevention

   • Inspect plants regularly, especially undersides of leaves
   • Encourage birds and natural predators to visit garden
   • Spray neem oil or garlic spray every 10–15 days during growing season
   • Plant aromatic herbs like basil, mint nearby to confuse pests
6. Sunburn and leaf scorchKeep an eye on it

   How to identify

   • Brown, crispy patches on leaf tips and margins
   • Bleached or pale yellow areas on leaves exposed to direct sun
   • Leaf curling and wilting in afternoon heat

   Likely cause

   Caused by intense direct sunlight in very hot climates, especially if plant is suddenly moved from shade to full sun, or during heatwaves with insufficient water.

   What to do now

   1. Move potted plants to location with partial shade, especially afternoon shade
   2. For ground plants, erect temporary shade cloth (30–50% shade) during hottest hours
   3. Increase watering frequency during hot spells to keep soil evenly moist
   4. Trim off badly scorched leaves to improve appearance; plant will recover with new growth

   Prevention

   • Gradually acclimatize young plants to full sun over 2 weeks
   • In very hot climates (above 38°C), provide afternoon shade
   • Mulch soil well to keep roots cool and conserve moisture
   • Water regularly, never let soil dry out completely in hot weather
7. Citrus psyllid (Diaphorina citri)Act today

   How to identify

   • Tiny jumping insects (2–3 mm) on young shoots and leaves
   • Distorted, curled, or puckered new leaves
   • White waxy deposits on leaves
   • Sooty mold on honeydew

   Likely cause

   Asian citrus psyllid, a sap-sucking pest that affects citrus family and related plants including curry leaf; can spread plant diseases.

   What to do now

   1. Prune and destroy heavily infested shoots immediately
   2. Spray with strong jet of water to dislodge psyllids
   3. Apply neem oil or insecticidal soap thoroughly, especially on new growth
   4. Repeat treatment every 7 days for 3 weeks
   5. For severe infestations, consult local agricultural extension for approved organic treatments

   Prevention

   • Inspect new growth weekly
   • Remove and destroy affected shoots promptly
   • Spray neem oil fortnightly during warm months as preventive
   • Avoid planting near citrus trees which are primary hosts