Post-disaster Sericulture Production Management Suggestions

**I. Mulberry Field Management After Floods** After a flood, it's crucial to drain the mulberry fields as quickly as possible to prevent prolonged waterlogging, which can lead to root rot and damage the trees. In low-lying areas where water tends to accumulate, it's important to clear drainage channels and remove standing water promptly. This helps lower the groundwater level and reduces the risk of mulberry tree decay. For mulberry fields that have suffered severe erosion or where the soil has been washed away, it's essential to reposition the trees and fill in the roots with fresh soil to stabilize them. If the field is bare, immediate replanting or soil improvement should be done to restore the land. In fields that were not severely flooded but still had high water levels, pruning can help stimulate new growth. Cutting the trees at a low height (20–30 cm from the ground) encourages the development of new shoots. This practice also helps reduce the risk of further damage from future floods. In areas near rivers or prone to frequent flooding, it's advisable to avoid cutting the mulberry trees immediately after a summer flood. Doing so may leave the trees vulnerable to a second flood, which could weaken their recovery and make them more susceptible to pests and diseases. Instead, focus on restoring the trees first, promoting root growth, and improving their ability to withstand waterlogging. Only after the flood season should you consider whether to proceed with summer pruning. Flooded mulberry fields often experience silt deposition, which acts like natural fertilizer. Once the soil dries slightly, it’s important to till the land to break up the compacted layers and improve soil aeration. When new shoots appear, apply additional fertilizer, manage irrigation carefully, and ensure proper drainage to maximize leaf production for the rest of the year and offset flood-related losses. **II. Silkworm Rearing Management After Floods** If silkworm houses or sericulture facilities have been flooded, they must be inspected for structural safety before reoccupation. After draining the water, thoroughly clean the premises, tools, and equipment. Remove all silt and dirt, and disinfect using a 1% available chlorine solution (1 kg of bleaching powder mixed with 25 kg of water). This helps prevent disease outbreaks and ensures a safer environment for future silkworm rearing. If the silkworm house is damaged, it should be repaired immediately before resuming rearing. In cases where the structure is completely destroyed, temporary shelters or simple silkworm houses can be used to continue production and support self-rescue efforts. After a flood, maintaining dry and well-ventilated conditions in the silkworm room is critical. Spread fresh lime powder to disinfect the area and avoid feeding silkworms with wet or muddy leaves, which can increase disease risks. **III. Production Recommendations** It’s recommended to replace vulnerable mulberry varieties in low-lying or flood-prone areas with more resilient types. These trees can survive up to seven days of flooding and have stronger root systems, making them better suited for such conditions. However, long-term waterlogging or areas prone to flooding for more than three days are unsuitable for mulberry cultivation. When selecting seedlings, choose varieties that adapt well to local conditions. In areas with limited seedling supply, use well-drained land to ensure healthy growth and meet planting needs. To reduce the risk of silkworm diseases, avoid rearing in hot and humid environments after a disaster. With most regions entering the high-temperature season by June, even though mulberry trees may grow vigorously, the climate becomes unsuitable for silkworm rearing. It’s best to harvest early to allow young silkworms to develop properly. During the hot season, ensure good ventilation and cooling in the silkworm room. Use shade structures to block direct sunlight and regularly disinfect with quicklime. Avoid feeding silkworms with damp leaves to maintain hygiene. In areas with heavy rainfall in the first half of the year, prepare for potential autumn droughts. Timely harvesting and applying fertilizers during the rainy season will help promote mulberry growth and ensure a successful harvest later in the year. *Guangdong Sericulture Technology Promotion Center*

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