Sapota (Manilkara zapota), popularly known as Chikoo, is a high-value tropical fruit crop cultivated for fresh consumption, processing and export. The crop flowers multiple times a year and requires continuous nutrient availability to sustain flowering, fruit set and fruit development. Integrating biofertilizers, biofungicides and biopesticides helps maintain healthy soil biology, improves nutrient uptake and provides natural protection against diseases and insect pests, resulting in higher productivity and premium-quality fruits.

Beneficial microorganisms colonize the root zone and enhance nutrient cycling, enabling stronger root systems, vigorous canopy development and better flowering throughout the year.

Azotobacter fixes atmospheric nitrogen and supplies biologically available nitrogen required for continuous vegetative growth and flowering. Phosphate Solubilizing Bacteria (PSB) convert unavailable phosphorus into plant-available forms, improving root growth, flowering and fruit retention. Potassium Mobilizing Bacteria (KMB) mobilize potassium from the soil, resulting in larger fruits, higher sweetness (°Brix), improved pulp quality, better fruit firmness and extended shelf life. NPK Microbial Consortia provide balanced nutrient availability throughout the production cycle for sustained fruiting.

Micronutrient-solubilizing microorganisms further improve orchard productivity. Zinc Solubilizing Bacteria enhance chlorophyll formation, enzyme activity and flower development. Sulphur Oxidizing Bacteria improve sulphur availability, enhancing protein synthesis, fruit flavor and aroma. Mycorrhiza (AMF) expands the effective root system, increasing phosphorus uptake, water-use efficiency and drought tolerance. Silicon Solubilizing Bacteria strengthen plant tissues, improve stress tolerance and reduce physiological disorders.

Sapota is affected by diseases including leaf spot, sooty mold, anthracnose, root rot, collar rot, wilt, dieback and stem canker. These diseases reduce tree vigor, fruit quality and orchard productivity.

Beneficial microorganisms provide long-term biological disease suppression. Trichoderma harzianum, Trichoderma viride and Trichoderma asperellum suppress soil-borne fungal pathogens such as Fusarium, Rhizoctonia and Phytophthora while promoting root development. Pseudomonas fluorescens acts as a plant growth-promoting rhizobacterium (PGPR), reducing disease incidence and activating systemic resistance. Bacillus subtilis produces natural antimicrobial metabolites effective against several fungal and bacterial pathogens. Pseudomonas putida and Streptomyces lydicus further improve rhizosphere health and strengthen the orchard's natural defense system.

Major insect pests include sapota seed borer, fruit fly, leaf webber, aphids, mealybugs, scale insects, termites, white grubs and root-knot nematodes. These pests reduce fruit quality, market value and overall productivity.

Beauveria bassiana effectively suppresses fruit borers, mealybugs, aphids and scale insects. Lecanicillium lecanii provides excellent biological control of aphids, mealybugs, whiteflies and other soft-bodied insects. Bacillus thuringiensis var. kurstaki (BTK) effectively controls caterpillars and fruit-boring larvae. Metarhizium anisopliae effectively manages termites and white grubs. Purpureocillium lilacinum and Pochonia chlamydosporia suppress root-knot nematodes, promoting healthy feeder roots and efficient nutrient uptake.

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

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Benefits of Biological Inputs in Sapota (Chikoo)

• Promotes vigorous root and canopy development
• Improves continuous 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
• Produces premium-quality fruits suitable for domestic and export markets

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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