In spring, prolonged rainfall leads to less sunlight exposure for mulberry leaves, making them more humid and increasing the overall moisture in the environment. This high humidity can hinder the movement of water and carbon dioxide within silkworms, reducing their ability to digest and absorb nutrients. As a result, silkworms consume more of their own body resources, leading to weakened health and increased vulnerability to pathogens. This makes it easier for silkworms to fall ill, and improper moisture control during spring rearing can easily lead to failure.
Therefore, when raising silkworms in spring, it's crucial to pay close attention to moisture levels. If not managed properly, it can result in significant losses. To prevent excessive moisture, there are three effective methods:
First, heating the silkworm rearing area helps reduce both the moisture content of the mulberry leaves and the humidity around the silkworms. The temperature should be maintained between 76°F to 82°F, with a wet-bulb and dry-bulb temperature difference of 3 to 5°F. This controlled environment helps maintain optimal conditions for silkworm growth.
Second, using dry, short sorghum stalks as padding at the bottom of the rearing tray can help absorb excess moisture. Additionally, mixing ash with lime or wood ash can further enhance the drying effect and improve disease resistance.
Third, feeding silkworms with smaller quantities of fresh, less moist leaves is recommended. By practicing "thin feeding," the amount of excrement produced is reduced, allowing better air circulation and faster drying of the waste, which in turn helps lower humidity levels in the rearing area.
By implementing these strategies, silkworm farmers can effectively manage moisture, promote healthier growth, and reduce the risk of disease during the rainy spring season.
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