Pseudomonas fluorescens for Cardamom – Control Capsule Rot, Stem Rot & Fusarium Wilt

Your cardamom clumps are the backbone of Idukki's economy. But every season, fungal diseases cause serious damage. Capsule rot (Azhukal disease) caused by Phytophthora meadii is one of the most destructive – infected capsules develop water‑soaked lesions, rot, and fall off. Stem rot caused by Fusarium oxysporum affects the middle portion of tillers, producing pale‑coloured lesions and dry rotting. These diseases are more prevalent during the monsoon seasons and can cause yield losses of 50% or more. Chemical fungicides give temporary relief but leave residues that can get your export shipment rejected – international buyers now test for over 400 chemicals.

Pseudomonas fluorescens is the KAU‑recommended natural solution.

Kerala Agricultural University (KAU) has developed and commercially distributes a specific strain, Pseudomonas fluorescens PN026, as a biocontrol agent against plant diseases. The KAU Agri‑Infotech Portal provides clear management guidelines for cardamom stem rot:

  • Prophylactic treatment: A prophylactic foliar spray and drenching of the plant bases with 2% Pseudomonas fluorescens PN026 preparation in cow dung supernatant before the onset of summer.

  • Combined application: Spraying 2% Pseudomonas fluorescens in water, together with a basal application of AMF (@100g) and Trichoderma asperellum PSP KAU T6 (@50g/plant).

Research evidence from Idukki:

A field experiment conducted in Idukki district evaluated the efficacy of biocontrol agents against Fusarium rot of cardamom. Results showed that P. fluorescens in cowdung slurry was the best management practice against Fusarium rot, followed by combined application of P. fluorescens with AMF and Trichoderma viride, as well as a chemical fungicide combination (captan + hexaconazole). Combined application of biocontrol agents (Pseudomonas fluorescens 2% spray with basal application of Trichoderma viride @100g and arbuscular mycorrhizal fungi Glomus fasciculatum @50g/plant) recorded higher yield and benefit‑cost ratios.

How does Pseudomonas fluorescens work against cardamom diseases?

  • Antibiosis: Produces antifungal metabolites such as pyrrolnitrin, pyoluteorin, and 2,4‑diacetylphloroglucinol (DAPG) that kill Phytophthora and Fusarium.

  • Competition: Colonises the root zone and outcompetes pathogens for nutrients and space.

  • Siderophore production: Produces iron‑binding compounds (siderophores) that starve fungal pathogens by depriving them of essential iron.

  • Induced systemic resistance (ISR): Triggers the plant's own defence mechanisms, making the plant more resistant to future attacks.

  • Volatile metabolites: Produces volatile compounds like HCN that inhibit fungal growth.

How to apply Pseudomonas fluorescens on cardamom (Bactostore method):

Prophylactic treatment (KAU‑recommended method for stem rot):

  1. Prepare a 2% solution of Pseudomonas fluorescens – mix 20 ml of Bactostore's liquid or 20g of powder in 1 litre of water.

  2. Mix this with cow dung supernatant (prepare by soaking well‑decomposed cow dung in water overnight, then filter).

  3. Spray on plant bases and drench the soil around each clump.

  4. Apply before the onset of summer (February‑March).

  5. For best results, combine with basal application of AMF (100g/plant) and Trichoderma asperellum (50g/plant).

Foliar spray (for capsule rot and foliar diseases):

  • For liquid formulation: Mix 2‑5 ml of Bactostore's Pseudomonas fluorescens liquid in 1 litre of water. For 1 acre, use 1‑2 litres of liquid diluted in 200‑400 litres of water.

  • For powder formulation: Mix 5‑10g of Bactostore's Pseudomonas powder in 1 litre of water. For 1 acre, use 1‑2 kg of powder diluted in 200‑400 litres of water.

  • For better results, add 2 kg jaggery (gur) – the sugar feeds the bacteria, boosting growth.

  • Spray thoroughly on both sides of leaves, on stems, and on capsules. Pay special attention to the base of plants where stem rot starts.

  • Spray in early morning or late evening when UV rays are low.

  • Repeat every 15 days during the monsoon season (June‑September).

Soil drench (for root rot and Fusarium wilt):

  • Mix 1‑2 litres of liquid or 1‑2 kg of powder in 200‑400 litres of water.

  • Drench the soil around each cardamom clump.

  • For better results, mix with well‑decomposed cow dung (50‑100 kg per acre).

  • Repeat every 30 days during the growing season.

Seed treatment (for nursery):

  • Mix 10 ml of Pseudomonas liquid in 1 litre of water.

  • Soak cardamom seeds for 10‑15 minutes before sowing.

  • Shade dry for 30 minutes before planting.

Important tips for cardamom farmers from KAU research:

  • Compatibility: Research shows 100% compatibility of Pseudomonas fluorescens with insecticides like acephate, quinalphos, chlorantraniliprole, dimethoate, imidacloprid, and neem/pongamia oil mixtures. It is also compatible with fungicides like hexaconazole and potassium phosphonate + hexaconazole mixture, and fertilisers like SSP, MOP, urea, bone meal, and urea granules.

  • NOT compatible with: Chlorpyriphos, acetamiprid, carbosulfan, fosetyl aluminium, copper hydroxide, COC (copper oxychloride), cymoxanil + mancozeb mixture, and micronutrient mixture. These chemicals significantly inhibit the growth of P. fluorescens.

  • Apply in early morning or late evening – UV rays kill the bacteria

  • Do not mix with copper‑based fungicides – they will kill the beneficial bacteria

  • Wait 5‑7 days after copper fungicide use before applying Pseudomonas

Buy from Bactostore. We deliver fresh Pseudomonas fluorescens – liquid or powder – to all Idukki cardamom areas. Mention "Cardamom disease control" for a 5% discount.

📞 Call 9146150117 | 🌐 www.peaklab.co.in

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