Banana Pests and Diseases: Identification, Damage and Effective Management

Banana (Musa spp.) is an important fruit crop in India, but insect pests, nematodes, and diseases can affect plant growth, bunch development, fruit quality, and yield. Early identification and integrated pest and disease management help maintain a healthy plantation.

1. Major Pests of Banana

Major Banana Pests: Symptoms and Management

1. Rhizome Weevil (Cosmopolites sordidus)

Symptoms: Grubs bore into the rhizome or corm, creating dark tunnels that weaken the plant. Infested plants show poor growth, yellowing, reduced bunch development, and may topple.

• Chemical control: Apply Fipronil 0.3% GR at 20 g/plant or Carbofuran 3% CG at 40 g/plant around the pseudostem at planting and every 6 months. For infected plants, drench the base and surrounding soil with Imidacloprid 17.8% SL (0.5 mL/L) or Chlorpyrifos 20% EC (2.5 mL/L). Alternatively, inject 3 mL of Imidacloprid solution (diluted 1:4 with water) into the corm to target internal grubs.

• Biological control: Apply Beauveria bassiana or Metarhizium anisopliae formulations suitable for banana weevil management. Use chopped pseudostem traps to attract adult weevils, then collect and destroy the trapped insects.

2. Pseudostem Weevil (Odoiporus longicollis)

Symptoms: Small holes appear on the pseudostem, often with gummy sap or dark, fibrous material emerging from them. Internal tunnelling causes tissue decay, weakening of the stem, and poorly developed bunches.

• Chemical control: Inject 2 mL of Imidacloprid 17.8% SL solution (1:4 dilution) into the stem at 0.6 m and 1.2 m heights.

• Apply Fipronil 0.3% GR at 20 g/plant into the leaf axils of 5 to 6-month-old crops.Spray the pseudostem surface thoroughly with Lambda-cyhalothrin 5% EC at 1 mL/L of water.
  
  

• Biological control: Place longitudinally split pseudostem traps in the plantation to capture adults. Apply suitable Beauveria bassiana formulations to traps where recommended, and destroy heavily infested stems. 

3. Banana Aphid (Pentalonia nigronervosa)

Symptoms: Aphids gather around leaf bases and the pseudostem, sucking sap and weakening plants. Their most important impact is transmitting Banana bunchy top virus (BBTV).

• Chemical control: Spray Thiamethoxam 25% WG at 0.3 g/L, Acetamiprid 20% SP at 0.4 g/L, or Imidacloprid 17.8% SL at 0.5 mL/L of water.Direct the high-pressure spray thoroughly into the topmost crown, leaf axils, and around the pseudostem base where colonies cluster.For tall plants, root-feed Imidacloprid 17.8% SL at 10 mL mixed with 10 mL of water per palm/mat to ensure systemic eradication.   

• Biological control: Conserve ladybird beetles, lacewings (Chrysoperla carnea), and other aphid predators. Use virus-free planting material and promptly remove infected plants.

4. Fruit Rust Thrips (Chaetanaphothrips signipennis)

Symptoms: Feeding between touching fruits produces reddish-brown or rusty patches on the peel. Severe damage causes fruit blemishes, cracking, and reduced market value.

• Chemical control: Perform bell injection at shooting stage with Imidacloprid 17.8% SL at 0.3 mL in 500 mL water (apply 1 mL solution/bud).Spray emerging bunches and leaf axils thoroughly using Spinetoram 11.7% SC at 1 mL/L or Acetamiprid 20% SP at 0.5 g/L of water.Apply Bifenthrin 25% EC at 2 mL/L or Fipronil 0.3% GR at 20 g/plant onto the soil basin to target pupating soil-stages.  

• Biological control: Cover bunches with suitable, ventilated bunch sleeves soon after bunch emergence. Remove old, neglected banana plants and conserve predatory insects.

5. Banana Leaf-Eating Caterpillar (Spodoptera litura)

Symptoms: Caterpillars feed on leaves, creating irregular holes and sometimes leaving only the veins. Severe infestation reduces functional leaf area and can affect bunch filling.

• Chemical control: At the first appearance of young larvae, apply Chlorantraniliprole 18.5% SC at 0.3 ml/L of water, only where the formulation is approved for banana and the target pest. Ensure good coverage of affected leaves and avoid spraying directly onto bunches near harvest.

• Biological control: Collect egg masses and young caterpillars where practical. Use Bacillus thuringiensis (Bt) products suitable for caterpillar control and conserve parasitoids and predators.

6. Burrowing Nematode (Radopholus similis)

Symptoms: Nematodes damage roots and corm tissues, causing reddish-brown to black root lesions, root decay, stunted growth, and poor anchorage. Plants may lodge, and bunch weight can decline.

• Chemical control: Before applying a nematicide, confirm the infestation and use only a product registered for banana and the target nematode. Apply any approved soil or root-zone treatment at the prescribed crop stage.
  Pecilia 1.0%
  

• Biological control: Use healthy, nematode-free planting material, remove severely affected roots where appropriate, and incorporate neem cake or suitable Pseudomonas fluorescens formulations as part of integrated management.

2. Major Diseases of Banana

1. Sigatoka Leaf Spot / Yellow Sigatoka (Pseudocercospora musae, formerly Mycosphaerella musicola)

Symptoms: Pale yellow streaks develop parallel to the leaf veins and gradually turn brown, forming elongated or elliptical spots with grey centres and yellow margins. Severe infection causes leaf drying and premature defoliation.

• Chemical control: Spray Mancozeb 75% WP at 1.5–2 g/L of water or Propiconazole 25% EC at 1 ml/L of water, where registered for banana. Begin when early streaks appear and repeat at 10–15-day intervals if conditions remain favourable for disease development, rotating fungicide groups.  

• Biological control: Remove severely affected leaves, maintain good drainage, avoid overcrowding, and use suitable Pseudomonas fluorescens or Bacillus subtilis formulations as preventive components of an integrated programme.

2. Panama Wilt / Fusarium Wilt (Fusarium oxysporum f. sp. cubense)

Symptoms: Older leaves turn yellow, beginning at the margins, and eventually wilt and hang around the pseudostem. The pseudostem base may split, while the corm shows reddish-brown to dark vascular discolouration.

• Chemical control: Drench the root zone basin and pseudostem base with Carbendazim 50% WP at 2 g/L or Propiconazole 25% EC at 2 mL/L of water (3–5 L solution/mat).Inject 3 mL of a 2% Carbendazim solution directly into the rhizome at a 45-degree angle using a corm injector syringe at 2-month intervals.Drench surrounding healthy mats with Azoxystrobin 18.2% + Difenoconazole 11.4% SC at 1 mL/L of water to arrest soil-borne spore spread.
    

• Biological control: Incorporate suitable Trichoderma or Pseudomonas fluorescens formulations with organic amendments as preventive measures. Maintain drainage and select cultivars resistant or tolerant to the relevant Fusarium strain.BioShield - TP — Bio-Pesticides – Khethari 

3. Banana Bunchy Top Disease (Banana bunchy top virus, BBTV)

Symptoms: Leaves become narrow, short, stiff, and upright, forming a bunchy appearance at the top. Dark green streaks or hook-shaped markings may appear along the veins and midrib. Plants produce small or no bunches.

• Chemical control: There is no chemical spray that cures BBTV. Control the aphid vector, Pentalonia nigronervosa, using a crop-approved aphicide only when required; this helps limit further spread but does not cure infected plants. Hifield Pyramid 
  Katyayani Thioxam  

• Biological control: Use virus-free tissue-culture plants or healthy certified suckers. Remove and destroy infected plants, including the corm, and control volunteer banana plants that may harbour the virus.

4. Anthracnose (Colletotrichum musae)

Symptoms: Small, circular, dark spots develop on fruit peel and may enlarge into sunken brown or black lesions. In humid conditions, infected fruit may show pinkish spore masses and premature ripening or shrivelling.

• Chemical control: Spray Mancozeb 75% WP at 2–2.5 g/L of water as a protective treatment where approved for banana, particularly when fruit disease risk is high. For post-harvest fruit, use only treatments specifically permitted for that use. 

• Biological control: Remove infected fruits and plant debris, use clean harvesting and packing equipment, and avoid fruit injury during harvesting and handling.

5. Cigar-End Rot (Musicillium theobromae, historically reported as Verticillium theobromae)

Symptoms: The tips of immature banana fingers turn black and dry, developing an ash-grey, cigar-like appearance. The affected tissues become dry, fibrous, and sometimes covered with grey fungal growth.

• Chemical control: Spray Mancozeb 75% WP at 1.5–2 g/L of water on developing bunches where approved. Begin preventive treatment when bunches emerge and disease risk is high, following the permitted application interval and pre-harvest interval.

• Biological control: Remove dried flower parts and infected fruit tips, maintain clean plantations, and use suitable, ventilated bunch covers soon after bunch emergence.

6. Bacterial Soft Rot (Dickeya spp. or Pectobacterium spp.; historically associated with Erwinia spp.)

Symptoms: The pseudostem base, corm, or other tissues become soft, water-soaked, and foul-smelling. Plants may wilt or collapse, particularly in warm, wet conditions. Streptocycline (0.5 g/L) + Copper Oxychloride 50% WP

• Chemical control: Drench the pseudostem base and soil basin with (2.5 g/L), applying 3–5 L/mat. Alternatively, apply Stable Bleaching Powder at 10–12 kg/acre through irrigation water. At the first sign of internal soft rot, inject 2 mL of 0.1% Streptocycline solution into the pseudostem.

• Biological control: Use healthy planting material, disinfect cutting tools, remove infected debris, improve drainage, and prevent injuries to the pseudostem base.

3. General Integrated Pest and Disease Management

• Planting material: Use healthy, pest-free suckers or certified tissue-culture plants.

• Field sanitation: Remove dried leaves, infested pseudostems, and diseased plants; do not leave infested plant material in the field.

• Weevil monitoring: Use pseudostem traps and inspect plants regularly for holes, gummy exudates, and tunnelling.

• Disease prevention: Maintain drainage, avoid waterlogging, and disinfect tools between plants in disease-affected fields.

• Bunch protection: Use suitable bunch covers to reduce thrips damage and improve fruit appearance.

• Balanced nutrition: Maintain adequate potassium and other nutrients to support plant vigour and bunch filling.