Guava (Psidium guajava) is one of the most profitable tropical fruit crops grown for fresh consumption, juice, pulp, nectar, jams and export markets. Producing healthy trees with profuse flowering, excellent fruit set, large fruits, high sweetness (Brix) and long shelf life requires balanced nutrition, healthy root systems and effective disease and pest management. Integrating biofertilizers, biofungicides and biopesticides provides a sustainable cultivation system that improves nutrient availability, strengthens plant health and naturally suppresses pests and diseases while improving long-term soil fertility.

Beneficial microorganisms establish around the guava rhizosphere and continuously improve nutrient cycling, enabling vigorous root growth, healthy canopy development and consistent fruit production year after year.

Azotobacter fixes atmospheric nitrogen and supplies biologically available nitrogen essential for vegetative growth and flowering. Phosphate Solubilizing Bacteria (PSB) convert unavailable phosphorus into plant-available forms, promoting stronger root systems, improved flowering and higher fruit set. Potassium Mobilizing Bacteria (KMB) improve potassium availability, resulting in larger fruits, higher sugar accumulation, improved pulp quality, better fruit firmness and longer shelf life. NPK Microbial Consortia provide continuous nutrient mobilization throughout the growing season.

Micronutrient-solubilizing microorganisms further improve orchard productivity. Zinc Solubilizing Bacteria enhance chlorophyll synthesis, enzyme activity and photosynthesis, supporting vigorous flowering and fruit development. Sulphur Oxidizing Bacteria improve sulphur availability for protein synthesis, fruit quality and aroma. Mycorrhiza (AMF) expands the effective root system, increasing phosphorus uptake, water absorption and drought tolerance. Silicon Solubilizing Bacteria strengthen plant tissues, improve tolerance to drought, salinity and heat stress while enhancing fruit quality.

Guava is susceptible to diseases including guava wilt, anthracnose, fruit canker, algal leaf spot, stem canker, dieback, sooty mould and root rot. These diseases reduce tree vigor, fruit yield and marketable quality.

Beneficial microorganisms naturally suppress disease-causing pathogens while improving plant immunity. Trichoderma harzianum, Trichoderma viride and Trichoderma asperellum effectively suppress Fusarium, Rhizoctonia, Pythium and other soil-borne pathogens while promoting vigorous root development. Pseudomonas fluorescens functions as a plant growth-promoting rhizobacterium (PGPR), reducing disease incidence and inducing systemic resistance. Bacillus subtilis produces natural antimicrobial compounds effective against fungal and bacterial pathogens. Pseudomonas putida and Streptomyces lydicus further improve rhizosphere health and provide long-term biological disease suppression.

Major insect pests include fruit flies, mealybugs, scale insects, aphids, bark-eating caterpillars, termites, white grubs and root-knot nematodes. These pests reduce fruit quality, transmit diseases and weaken trees.

Beauveria bassiana effectively suppresses fruit flies, mealybugs and bark-eating caterpillars. Lecanicillium lecanii provides excellent biological control of aphids, mealybugs, scale insects and whiteflies. Bacillus thuringiensis var. kurstaki (BTK) controls leaf-feeding caterpillars. Metarhizium anisopliae effectively manages termites and white grubs. Purpureocillium lilacinum and Pochonia chlamydosporia suppress root-knot nematodes, promoting healthy feeder roots and improving nutrient uptake.

Applying microbial products through basin application, drip irrigation, organic manure enrichment and periodic root-zone drenching enables beneficial microorganisms to establish around the root system. Combined with balanced fertilization, irrigation and canopy management, biological crop management improves nutrient-use efficiency, enhances flowering and supports sustainable guava production.

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Benefits of Biological Inputs in Guava

• Promotes vigorous root and canopy development
• Improves flowering and fruit set
• Increases fruit size, weight and uniformity
• Enhances sweetness (Brix), pulp quality and aroma
• Improves shelf life and transportability
• Suppresses major fungal and bacterial diseases
• Controls important insect pests naturally
• Reduces root-knot nematode infestation
• Improves soil fertility and beneficial microbial activity
• Increases marketable yield and export quality

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Recommended Biofertilizers

• Azotobacter
• Phosphate Solubilizing Bacteria (PSB)
• Potassium Mobilizing Bacteria (KMB)
• NPK Microbial Consortia
• Zinc Solubilizing Bacteria
• Sulphur Oxidizing Bacteria
• Mycorrhiza (AMF)
• Silicon Solubilizing Bacteria

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Recommended Biofungicides

• Trichoderma harzianum
• Trichoderma viride
• Trichoderma asperellum
• Bacillus subtilis
• Pseudomonas fluorescens
• Pseudomonas putida
• Streptomyces lydicus

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Recommended Biopesticides

• Beauveria bassiana
• Lecanicillium lecanii
• Bacillus thuringiensis var. kurstaki (BTK)
• Metarhizium anisopliae
• Purpureocillium lilacinum
• Pochonia chlamydosporia
• Hirsutella thompsonii (for mite management where applicable)

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Recommended Application Program