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What are the control measures for trimolter silkworms?

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At present, most silkworms reared in our province are tetramolters. Under normal incubation and rearing conditions, a tetramolter should molt four times in one generation. However, if incubation and rearing conditions are poor, a tetramolter may molt only three times in one generation, resulting in reduced mulberry consumption, smaller cocoon shape, and lower yield. The reasons why tetramolters molt only three times include: incubation under low temperature of around 20°C, dry and dark conditions; receiving more than 12 hours of light per day during the young silkworm stage; feeding mulberry leaves that are too tender or too high in protein; after the silkworm eggs are brought back, they are not kept warm and protected, and are

At present, most silkworms reared in our province are tetramolters. Under normal incubation and rearing conditions, a tetramolter should molt four times in one generation. However, if incubation and rearing conditions are poor, a tetramolter may molt only three times in one generation, resulting in reduced mulberry consumption, smaller cocoon shape, and lower yield.

The reasons why tetramolters molt only three times include: incubation under low temperature of around 20°C, dry and dark conditions; receiving more than 12 hours of light per day during the young silkworm stage; feeding mulberry leaves that are too tender or too high in protein; after the silkworm eggs are brought back, they are not kept warm and protected but are directly placed at natural temperature for supplementary incubation, resulting in excessively long supplementary incubation time and accumulated temperature failing to reach the standard; long-term exposure to high temperatures during the rearing process, and so on.

To prevent the occurrence of trimolter silkworms, the following five points should be done well: (1) Eggs must be ordered from the sericulture technology promotion and service department, that is, the main channel. (2) Supplementary incubation must be carried out as required. After the silkworm eggs are brought back, supplementary incubation should be carried out at a suitable temperature; the air must not be too dry, humidity should be controlled at around 80%, and attention should be paid to dark protection. (3) Fertilization management of mulberry fields must be done well, mainly with organic fertilizer and combining organic and inorganic fertilizers. Applying too much nitrogen fertilizer to mulberry fields easily makes the protein content in mulberry leaves too high, and after silkworms eat such mulberry leaves, trimolter silkworms are likely to appear. (4) The leaf quality must be strictly controlled, especially during the rearing of young silkworms; do not feed mulberry leaves that are too tender, and insist mainly on feeding leaves of suitable maturity. (5) Avoid long-term exposure to high temperatures above 30°C during the rearing process, and do a good job of heatstroke prevention and cooling in high-temperature weather.

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