Taro (Colocasia esculenta), commonly known as arbi, colocasia or eddoe, is an important tropical tuber crop cultivated for its edible corms, cormels and leaves. It is widely grown for fresh markets, food processing, starch production and export. Producing large, uniform corms with high starch content and excellent storage quality requires balanced nutrition, vigorous root systems and effective disease and insect management. Integrating biofertilizers, biofungicides and biopesticides provides a sustainable cultivation system that improves nutrient availability, enhances plant vigor and naturally suppresses diseases and pests while improving long-term soil fertility.

Beneficial microorganisms establish around the taro root system and continuously improve nutrient cycling, enabling vigorous leaf growth, healthy feeder roots and uniform corm development throughout the crop cycle.

Azotobacter is the preferred nitrogen-fixing biofertilizer for taro because it supplies biologically available nitrogen required for vigorous vegetative growth and corm bulking. Phosphate Solubilizing Bacteria (PSB) convert insoluble phosphorus into plant-available forms, promoting stronger root systems, improved corm initiation and efficient nutrient uptake. Potassium Mobilizing Bacteria (KMB) enhance potassium availability, resulting in larger corms, increased starch accumulation, improved dry matter and longer storage life. NPK Microbial Consortia provide balanced nutrient mobilization throughout crop development.

Micronutrient-solubilizing microorganisms further improve crop productivity. Zinc Solubilizing Bacteria improve chlorophyll synthesis, enzyme activity and photosynthesis, supporting vigorous foliage growth. Sulphur Oxidizing Bacteria improve sulphur availability for protein synthesis and overall corm quality. Mycorrhiza (AMF) expands the effective root system, improving phosphorus uptake, water absorption and drought tolerance. Silicon Solubilizing Bacteria strengthen plant tissues, reduce stress caused by drought and salinity and improve corm quality.

Taro is susceptible to diseases including taro leaf blight, Pythium root rot, Phytophthora corm rot, Fusarium wilt, bacterial soft rot, Cercospora leaf spot, anthracnose and damping-off. These diseases reduce foliage health, corm size and storage quality.

Beneficial microorganisms naturally suppress disease-causing pathogens while improving plant immunity. Trichoderma harzianum, Trichoderma viride and Trichoderma asperellum effectively suppress Pythium, Phytophthora, Fusarium and other soil-borne pathogens while promoting vigorous root development. Pseudomonas fluorescens functions as a plant growth-promoting rhizobacterium (PGPR), suppressing bacterial diseases 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 taro beetles, aphids, caterpillars, cutworms, termites, white grubs, mites and root-knot nematodes. These pests damage leaves, roots and corms, reducing yield and market quality.

Bacillus thuringiensis var. kurstaki (BTK) effectively controls caterpillars and leaf-feeding larvae. Beauveria bassiana suppresses aphids, beetles and other soft-bodied insects. Lecanicillium lecanii provides effective biological control of aphids, whiteflies and mites. Metarhizium anisopliae effectively manages termites, white grubs and soil-dwelling insect pests. Purpureocillium lilacinum and Pochonia chlamydosporia suppress root-knot nematodes, promoting healthy root systems and improved corm development.

Applying microbial products through seed corm treatment before planting, soil application, drip irrigation and periodic soil drenching enables beneficial microorganisms to establish rapidly around the root zone. Combined with balanced fertilization, mulching and proper irrigation, biological crop management improves nutrient-use efficiency, enhances corm development and supports sustainable taro cultivation.

Benefits of Biological Inputs in Taro

• Improves seed corm sprouting and plant establishment
• Promotes vigorous root and leaf development
• Enhances corm initiation and bulking
• Increases corm size, weight and marketable yield
• Improves starch content and dry matter
• Extends storage life and post-harvest quality
• Suppresses major fungal and bacterial diseases
• Controls important insect pests naturally
• Reduces root-knot nematode infestation
• Improves soil fertility and beneficial microbial activity

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

Recommended Biofungicides

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

Recommended Biopesticides

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

Recommended Application Program