Their eggs typically hatch within 9 to 12 days, meaning there can be up to eight generations of larvae throughout the year. In addition, there are polyvoltine silkworms, only found in the tropics.
Bivoltine varieties are normally found in East Asia, and their accelerated breeding process is made possible by slightly warmer climates. Univoltine eggs must hibernate through the winter, ultimately cross-fertilizing in spring. Univoltine silkworms produce only one brood a season, and they are generally found in and around Europe. Mulberry silkworms can be divided into three major categories based on seasonal brood frequency.
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"Silkworm" in seal script (top), Traditional (middle), and Simplified (bottom) Chinese characters
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