Best Practices for Mulberry Leaf Harvesting in North India’s Sericulture

In North India’s sericulture belt, the quality of silk starts not in the reeling factory but in the mulberry garden – specifically, at the moment leaves are harvested. The harvesting method a farmer chooses directly affects leaf freshness, nutritional value, labour costs, and even the long-term health of the mulberry plantation. Since mulberry foliage is the sole food source for the silkworm (Bombyx mori), getting the harvest right is non-negotiable. North Indian farmers work with two broad plantation styles – bush (dwarf) and tree-type – and each demands a different approach to leaf collection.

Two plantation systems that shape harvesting 🔗

Before understanding harvesting methods, it helps to know the two main ways mulberry is cultivated across North India’s subtropical zones. Bush or dwarf plantations are created by repeated pruning of mulberry plants to keep them short and compact, typically under 5-6 feet. This system suits smaller land holdings, which are common in states like Uttar Pradesh and parts of Jammu & Kashmir. Because the canopy stays low, every leaf is within easy reach of the harvester.

Tree-type plantations, on the other hand, allow mulberry to grow to its natural height – often 15-20 feet or more. This system is more popular where land holdings are larger, such as in parts of Himachal Pradesh. Tree-type mulberry produces higher overall biomass over a longer productive life, but the height introduces obvious challenges when it comes to collecting leaves efficiently.

The choice between these two systems is the first decision that determines which harvesting method a farmer will rely on.

Individual leaf picking: the selective approach 🔗

Individual leaf picking is exactly what the name suggests – each leaf is hand-plucked from the mulberry plant one at a time. This is the most common harvesting method practised across India, and it remains especially relevant for bush-type plantations in North India’s subtropical belt.

Why leaf picking suits bush plantations 🔗

The compact structure of bush mulberry means workers do not need ladders or special equipment. They can walk through the rows and pick leaves at a comfortable height. More importantly, leaf picking allows the farmer to be highly selective. Not all leaves on a plant are of the same quality or maturity. Young silkworms (early instars) need tender, young leaves, while older silkworms can handle slightly more mature foliage. Individual picking makes it possible to match the leaf to the silkworm’s growth stage with precision.

Autumn: the preferred season for leaf picking in North India 🔗

In North India’s subtropical climate, the period from September to November is considered optimal for individual leaf picking. Several factors converge during autumn to create ideal conditions. Moderate temperatures and lower humidity result in leaves that have higher nutritional density and lower excess moisture. The cooler weather reduces stress on both plants and workers. Leaves harvested in autumn also tend to retain freshness longer during transport and storage compared to those picked in the heat of summer.

The post-monsoon surge in growth adds another advantage – plants that received plenty of rain during July and August push out vigorous new foliage by September, giving farmers a generous supply of quality leaves just when autumn silkworm rearing cycles begin.

Limitations of leaf picking 🔗

The biggest drawback is labour intensity. Plucking leaves one by one is slow work. A single worker can cover far less area per hour compared to other methods. In regions where agricultural wages are rising, this translates into significantly higher harvesting costs. Additionally, individually picked leaves lose moisture faster once separated from the plant, so they must be transported to the rearing house quickly to prevent wilting.

According to IndiaAgroNet, leaf picking typically begins about 10 days after bottom pruning, with subsequent harvests at intervals of 7-8 weeks. Despite its cost, the method’s selectivity keeps it relevant wherever leaf quality must be tightly controlled.

Shoot harvesting: efficiency meets plant care 🔗

Shoot harvesting takes a fundamentally different approach. Instead of removing leaves individually, the farmer cuts entire shoots – young branches with leaves still attached. This method is widely practised on tree-type mulberry plantations in North India and is increasingly adopted by commercial sericulture farms of all sizes.

How shoot harvesting works 🔗

The farmer uses a sharp sickle or pruning tool to cut shoots at an appropriate point on the branch. The harvested shoots, complete with multiple leaves, are then bundled and transported to the rearing house. Because the leaves remain attached to their stems, they retain moisture far longer than individually picked leaves. This is a significant practical advantage – it gives farmers more time between harvest and feeding without a drop in leaf quality.

Shoots used for silkworm feeding are typically 50-60 days old, representing an optimal balance between tenderness and nutritional content. In the shoot rearing method, these leafy branches are placed directly on rearing racks, and silkworms feed on them in situ. This further reduces the handling involved.

The dual benefit: harvesting plus pruning 🔗

One of the most valuable aspects of shoot harvesting is that it doubles as a pruning operation. When you cut shoots, you are simultaneously removing growth from the plant, which stimulates the production of new lateral branches and fresh foliage. According to the FAO’s documentation on Indian mulberry cultivation, this combination of leaf collection and pruning is considered more economical than separate operations.

Regular shoot harvesting encourages bushier regrowth, improves air circulation within the canopy, and helps maintain the plant at a manageable height – all of which contribute to a healthier, more productive plantation over successive seasons.

Labour and cost savings 🔗

The efficiency gains of shoot harvesting are substantial. A single cut yields multiple leaves at once, dramatically reducing the time and labour needed per kilogram of harvested foliage. Where labour costs make up a large share of sericulture expenses, this can be the difference between a profitable operation and a struggling one. Farmers who switch from leaf picking to shoot harvesting often find they can manage a larger plantation area with the same workforce.

This scalability factor is one reason shoot harvesting has become the preferred method for commercial sericulture operations across North India.

Seasonal considerations for harvesting in North India 🔗

North India’s climate swings from hot summers to cold winters, and each season presents distinct challenges for leaf harvesting.

Summer (April-June) 🔗

High temperatures accelerate moisture loss from harvested leaves. Farmers need to harvest during the cooler hours – early morning or late evening – to minimise wilting. Leaves should be transported quickly and stored in cool, well-ventilated spaces. Shoot harvesting has an edge here because leaves attached to stems dry out more slowly than loose leaves.

Monsoon (July-August) 🔗

Heavy rainfall and high humidity promote rapid plant growth, producing abundant foliage. However, excess moisture on leaves can encourage fungal diseases like powdery mildew, which thrives in humid conditions. Careful selection of healthy, disease-free leaves becomes especially important during this period.

Autumn (September-November) 🔗

As mentioned earlier, this is the peak season for leaf picking. Post-monsoon growth offers a generous supply of nutritious foliage, and moderate weather conditions make both harvesting and storage more manageable.

Winter (December-February) 🔗

Plant growth slows significantly during winter, and leaf availability drops. However, the leaves that are available tend to have higher dry matter content and more concentrated nutrition. Shoot harvesting during winter is particularly useful because the pruning effect stimulates early regrowth as spring approaches. Subtropical regions in India often face a shortage of quality mulberry leaf during colder months, which is a key challenge for rearing high-yielding bivoltine silkworm hybrids.

Maintaining leaf quality after harvest 🔗

Regardless of the method used, how leaves are handled after cutting is just as important as how they are harvested. Poorly handled leaves lose their nutritional value quickly and can even become harmful to silkworms.

Transport best practices 🔗

Harvested leaves or shoots should be placed in bamboo baskets that allow air circulation. Plastic bags or sealed containers trap moisture and heat, leading to fermentation and fungal growth. Covering the baskets with a damp gunny cloth helps maintain humidity around the leaves without making them soggy. Transport should happen during cooler parts of the day, and leaves should reach the rearing house as quickly as possible.

Storage guidelines 🔗

If leaves cannot be fed to silkworms immediately, they should be stored in a clean, cool, well-ventilated room. Freshly harvested leaves are best used within 24-48 hours. Leaves with any signs of yellowing, brown spots, or pest damage should be removed, as they can negatively affect silkworm health and cocoon quality.

For shoot-harvested material, the leaves stay fresher longer because they remain attached to the stem, drawing residual moisture and nutrients. This is one of the practical reasons branch cutting and shoot methods are preferred when large quantities of feed are needed over a short period.

Choosing the right method for your plantation 🔗

There is no single “best” harvesting method – the right choice depends on the plantation type, available labour, scale of operation, and the specific silkworm instar being reared. Here is a quick comparison:

Individual leaf picking is ideal when you need precise control over leaf quality, when rearing young-age silkworms that require tender leaves, and when operating bush-type plantations with adequate labour. It is particularly suited to smaller operations where quality takes priority over volume.

Shoot harvesting is the better choice for tree-type plantations, large-scale operations, and situations where labour is limited or expensive. It is also preferred during late-age silkworm rearing, when worms consume massive quantities of foliage and speed of supply matters more than individual leaf selection.

Many experienced sericulturists use both methods in combination – leaf picking for early-instar worms and shoot harvesting for late-instar worms – to balance quality with efficiency throughout a single rearing cycle.

The link between harvesting and long-term plantation health 🔗

Harvesting is not just about collecting leaves for today’s silkworms; it is an act of plantation management. Over-harvesting weakens mulberry plants and shortens their productive life. According to the FAO, mulberry should be pruned after one year at the onset of the monsoon, and the first crop should be harvested six months after planting. Following recommended intervals between harvests – and rotating harvest areas across the plantation – ensures that plants get enough recovery time to maintain vigour.

Shoot harvesting, when done correctly, supports this recovery cycle by acting as a built-in pruning system. The key is to avoid cutting too aggressively. Leaving enough stem length and buds on the plant ensures it can regenerate healthy new shoots for the next harvest cycle.

Sustainable harvesting practices not only protect the current plantation but also improve leaf yields progressively over time. Research from the Regional Sericultural Research Station in Jammu has evaluated different plantation systems for their yield-contributing characteristics, reinforcing that the combination of proper spacing, pruning, and harvesting technique has a direct impact on long-term productivity.

What do you think? Given the rising labour costs in North India, could mechanised or semi-mechanised shoot harvesting tools become the next big shift in mulberry sericulture – or does the precision of hand-picking remain irreplaceable for producing premium-quality silk?

References

1. https://www.fao.org/4/x9895e/x9895e04.htm
2. https://www.ijcmas.com/9-12-2020/Santoshkumar%20Magadum,%20et%20al.pdf
3. https://www.vedantu.com/biology/moriculture
4. https://link.springer.com/article/10.1007/s10681-011-0523-x
5. https://indiaagronet.com/Moriculture/
6. https://www.agrifarming.in/mulberry-cultivation
7. https://www.infonet-biovision.org/fodder-production/mulberry-trees
8. https://byjus.com/chemistry/moriculture/