Growing Mulberry (Shahtoot) in North Karnataka
Why grow mulberry (shahtoot) in North Karnataka?
Mulberry is a resilient, multi-purpose crop: leaf production feeds silkworms for sericulture, while fruits provide a local fresh market and value‑added product options. In North Karnataka the crop adapts well to subtropical conditions where access to irrigation and basic soil management are present. This guide focuses on practical on-farm steps for smallholders and commercial growers.
Variety selection
Choose varieties suited to your objective: leaf yield for sericulture or fruit quality for fresh markets. Consider local availability and grafted plant quality.
- For sericulture: locally recommended fast-growing, high-leaf-yield varieties — choose healthy, disease-free planting material from a reliable nursery.
- For fruit: select varieties known locally for taste, fruit size and colour; grafted trees give quicker fruiting and predictable traits.
- Common types: Morus alba (white mulberry) is widely used for silkworm feeding and adapts well; other species and hybrids may produce larger or darker fruit but check nursery quality and adaptability.
Site selection and soil
Mulberry tolerates a range of soils but performs best on well-drained loams. Avoid heavy waterlogged sites. Ideal sites in North Karnataka have:
- Good access to irrigation (drip or surface)
- Neutral to slightly alkaline soils; pH 6.5–8.0 works for most varieties
- Protected spots against strong, desiccating winds if possible
Land preparation
Prepare the land before planting:
- Clear weeds and plough to 20–30 cm to loosen soil.
- Mark pits at the recommended spacing (see below); dig pits 45–60 cm wide and 45–60 cm deep.
- Mix topsoil with farmyard manure (5–10 kg per pit) and well‑rotted compost; add a handful of rock phosphate if available.
Planting: spacing and methods
Spacing depends on purpose and training system.
- For leaf production (sericulture): common spacings are 3 m x 3 m or 2.5 m x 3 m to allow access for regular pruning and leaf harvest.
- For fruit orchards: 4 m x 4 m or 5 m x 5 m spacing gives room for canopy development and machinery access.
- Plant grafted saplings or rooted cuttings at the same soil level as in the nursery. Water immediately after planting and provide shade for the first few weeks if necessary.
Irrigation and water management
Mulberry responds well to regular moisture but does not like standing water:
- Establish young plants with frequent light watering until established (2–3 months).
- Use drip or micro-sprinkler irrigation where possible to save water and keep foliage drier between irrigations, reducing disease risk.
- During dry season, water every 7–10 days for established plants; increase frequency in very hot spells or for leaf production demands.
Nutrient management
Apply nutrients based on soil tests if available. As a practical program for established trees, use a split fertilizer approach:
- Organic: apply well‑rotted farmyard manure or compost annually (10–20 kg per tree) at the onset of monsoon or before new flushes.
- Inorganic: a balanced NPK fertilizer split across the growing season. For smallholders, a typical recommendation is three splits of nitrogen (early growth, mid-season and start of monsoon).
- Micronutrients: zinc and iron deficiencies can occur; foliar sprays of micronutrient mixes or zinc sulphate (if deficiency symptoms present) help recover growth.
Pruning and training
Pruning strategy depends on the end use:
- For sericulture: short, pollarded trees or hedgerow systems are common. Regular coppicing/heading encourages fresh leaf flushes. Remove older woody growth to encourage new shoots.
- For fruit: train to an open-centre or modified leader system to facilitate light penetration and harvest. Remove dead, crossing or diseased branches in the dry season.
- Timing: main pruning in the dormant or dry season; light pruning after major leaf harvests to stimulate new growth.
Pest and disease management
Monitor regularly and use integrated approaches:
- Common pests: shoot borers, mealybugs, aphids and caterpillars can affect leaves and shoots. Manual removal, neem oil sprays or approved insecticides targeted by scouting results work. For sericulture, avoid harsh pesticides that harm silkworms.
- Diseases: powdery mildew and leaf spots may appear in humid conditions. Improve air circulation by pruning, avoid overhead irrigation during humid spells, and apply fungicides if necessary based on extension advice.
- Sanitation: remove and burn heavily infested material away from the orchard to reduce inoculum and pest habitats.
Harvesting and post-harvest
Leaf harvests for sericulture require regular, scheduled picking to supply silkworms; timing and quality are critical. For fruit:
- Harvest ripe fruit by hand; they are soft when ripe so handle gently.
- Sort and cool quickly for market; mulberries are perishable and benefit from rapid sale or processing (juices, jams, drying).
Intercropping and crop rotations
Young mulberry blocks can be intercropped with short-duration crops or legumes to provide income and improve soil during establishment. Avoid deep-rooted competitive crops near the tree base. When used in sericulture, keep alleys clean for easy leaf harvesting.
Economics and marketing tips
Decide your primary market before planting. For sericulture, contract arrangements with rearing units can provide stable demand. For fresh fruit, identify local buyers, small processors, or collectives that can handle perishable produce. Value addition (jam, concentrate) reduces spoilage risk but requires additional processing capacity and food safety considerations.
Practical on-farm checklist
- Source healthy grafted plants or certified cuttings from a trusted nursery.
- Ensure irrigation access (preferably drip) before planting.
- Prepare pits with organic matter and plant at correct spacing.
- Implement routine pruning and nutrient split program.
- Scout weekly in growing season for pests and diseases; use IPM.
- Plan harvest schedule and buyer contacts ahead of fruiting or leaf production.
Final notes
Mulberry responds well to attentive management. For growers in North Karnataka, the keys are reliable water, clean planting material, regular pruning for the intended purpose, and close pest monitoring. Start small to master timing of pruning and harvest, then scale up once you have stable demand and routines in place.