Mulberry Silkworm in Tanjore: Complete Cultivation Guide
Why Tanjore (Thanjavur) works for mulberry-sericulture
Tanjore’s flat, well-drained soils, reliable groundwater and established sericulture extension support make it suitable for mulberry and silkworm production when you match cultivar choice, irrigation and rearing practices to local conditions. This guide focuses on what farmers in and around Tanjore need to get a dependable crop and good-quality cocoons for the market.
1. Planning and site selection
Choose a site with good sunlight (at least 6–8 hours daily), gentle slope for drainage, and access to water for regular irrigation. Ideally the field should be within an hour’s travel of your rearing shed to minimise leaf storage time and handling stress for larvae.
- Soil: well-drained sandy loam to clay loam with pH 6.0–7.5 is suitable. Avoid waterlogged patches.
- Irrigation: ensure reliable water (borewell/tubewell or lateral canals). Drip or surface irrigation both work; mulberry tolerates moderate salinity poorly.
- Access: road access for selling cocoons and getting inputs matters.
2. Mulberry cultivar and planting
Use improved mulberry saplings recommended by state sericulture or local research stations. Locally adapted cultivars perform better under the Tanjore climate than random types.
Planting material and spacing
- Common planting methods: pit planting or stump planting. Use rooted cuttings or tissue-cultured plants where available.
- Spacing: common hedgerow systems use rows 1.0–1.2 m apart with 0.3–0.5 m between plants within a row for high-density cut-and-come-again harvests. For standard field systems, 2.0 m x 1.0–1.5 m spacing is used for one-cut stumps.
- Planting time: best at the start of the monsoon or in spring so young plants establish before peak dry season.
Initial care
- Apply well-decomposed farmyard manure at planting (10–15 kg per pit) and a starter dose of NPK as advised by local extension.
- First year: frequent watering, keep weed-free and protect from grazing animals.
3. Nutrition, pruning and irrigation for continuous leaf supply
Mulberry is cut-and-come-again. Your management determines leaf quality and yield per hectare.
- Fertiliser: apply split doses of nitrogen during the growing season (e.g., basal + top dressings). Apply phosphorus and potassium as per soil test recommendations or local extension guidance.
- Irrigation: water frequently in the dry months to maintain leafy growth; reduce just before harvesting leaves for silkworms to avoid excess moisture on foliage.
- Pruning: standard practice is to cut plants to a coppice height (e.g., 30–45 cm) to induce fresh sprouting. For multicut systems, light pruning and leaf harvesting cycles of ~40–60 days are common, depending on season and variety.
4. Pest and disease management on mulberry
Monitor regularly. Common problems include leaf-eating caterpillars, pyralid borers, and fungal leaf spots. Early detection and integrated measures preserve leaf quality for silkworms.
- Practice timely weeding and sanitation—remove and burn/compost infected material away from fields.
- Use light traps, neem-based sprays or Bacillus thuringiensis (Bt) for caterpillars where allowed and registered—avoid heavy insecticides that leave residues on leaves.
- Fungal disease control: ensure good airflow, avoid overhead irrigation late in the day, and apply fungicides only when necessary following label guidance.
5. Setting up a silkworm rearing house
Hygiene and microclimate control matter more than fancy construction. Keep the rearing space clean, vermin-proof, and able to hold temperature and humidity within target ranges for healthy larvae.
- Location: close to your mulberry blocks to reduce leaf storage time.
- Structure: simple brick or thatched houses are used; floors should be raised or concrete for easy cleaning. Provide adjustable ventilation to control temperature/humidity.
- Cleanliness: disinfect before each batch; wash trays and tools; restrict access to essential staff only.
6. Silkworm breeds and seed (eggs)
Use disease-free layings (DFLs) supplied by recognised seed producers or Government sericulture stations. Choose races adapted to local climate and market — consult the Tamil Nadu Sericulture Department for recommended strains.
- Order DFLs in advance and work on a production calendar so leaf supply matches larval demand.
- Store eggs as recommended until use; follow incubation procedures closely.
7. Rearing process: from hatching to cocoon
Silkworms pass through five instars (stages). Good feeding, hygiene and handling at each stage prevent losses and improve cocoon quality.
Housing and trays
- Keep larvae on clean trays, bamboo frames or rearing racks. Provide fresh leaves in small quantities frequently, especially in later instars when appetite increases.
Feeding schedule and leaf quality
- Feed young larvae (chawki stage) with tender, young leaves (flushes 1–3) cut into small pieces. Older larvae take larger leaves from subsequent flushes.
- Frequency: feed 5–6 times daily in high-temperature months, fewer times in cooler periods. Never allow larvae to remain hungry for long or feed so much that leaves rot in the tray.
- Leaf handling: pick in the cool of morning, use clean containers, avoid sun-exposed leaves, and remove petioles and dust that irritate larvae.
Temperature and humidity targets
Ideal conditions depend on the breed, but generally:
- Temperature: keep around 23–28°C for most rearing stages; slightly higher for younger larvae if local recommendations advise.
- Humidity: moderate humidity (70–85%) helps moulting; prevent extreme humidity that encourages mold.
Sanitation and moult care
- Before moulting, stop feeding a few hours to help the process, then resume with clean leaves after moulting completes.
- Regularly collect faecal pellets and spent leaves to keep trays clean. Dispose of waste away from rearing house.
8. Common larval problems and remedies
- Stomach upsets and diarrhoea: often caused by poor-quality or hot leaves. Switch to fresh, young leaves and improve hygiene.
- Failure to moult or uneven growth: check temperature/humidity and stocking density; reduce stress and improve ventilation.
- Diseases (viral/bacterial/fungal): prevention is better—use DFLs, strict hygiene, and quarantine suspect batches. Seek veterinary sericulture advice on any outbreak before applying chemicals.
9. Cocooning and harvest
Move mature larvae to clean mounting frames or grass mats for cocooning. Avoid disturbances during spinning; collect cocoons 7–10 days after spinning begins depending on climate and breed.
- Harvesting: pick cocoons carefully to avoid breaking filaments. Dry any damp cocoons under shade before grading.
- Grading: separate by size, color and weight as buyers demand. Well-formed, intact cocoons fetch better prices at markets and to silk reeling units.
10. Post-harvest: marketing and selling cocoons
Know your buyers: local coop societies, private silk reeling units, and state-run stores. Timely sale after harvest is important—store cocoons in cool, ventilated conditions and avoid long storage in high humidity.
- Quality matters: buyers look for weight, shell ratio and absence of stains or broken cocoons.
- Collect market information: prices vary by season and quality; co-ordinate with neighbouring growers or the local sericulture office to time sales and aggregate produce for better bargaining.
11. Record keeping and economics
Keep straightforward records of planting dates, fertiliser use, DFLs purchased, feed schedules, mortalities, cocoon yield and sales. This practical data lets you adjust practices and improve returns crop by crop.
Practical tips specific to Tanjore growers
- Coordinate leaf harvesting times to match local climate—early morning picking keeps leaves cool and reduces larval shock.
- Use local extension services (Tamil Nadu Sericulture Department or Krishi Vigyan Kendra) for recommended cultivars and DFL sources.
- Start small and stabilise one or two crops before scaling up; a steady supply chain for cocoons is as important as biological management.
Closing advice
Sericulture links farm-level mulberry management with careful rearing practice. Success in Tanjore comes from combining well-managed, regularly pruned mulberry blocks, disciplined hygiene in rearing, and market awareness. Work with local extension officers, join farmer groups for collective bargaining, and keep records so each crop teaches you what to change next.