1, silkworm eggs: The first stage of the growth of silkworm babies is silkworm eggs, which are round and transparent at birth and will turn black after a period of time.
2. Larvae: The newly hatched larvae are black and have fine hairs all over the body. At this time, it is necessary to provide fresh mulberry leaves to supplement its nutrition.
3. Cocoon formation: The third stage is cocoon formation. At this time, you have the ability to spin silk and form cocoons.
4. Adult: The fourth stage of silkworm baby is adult. After cocoon formation, it will take ten days to break out.
Silkworm baby, also known as silkworm, is one of the economic insects that feed on mulberry leaves and cocoon. Silkworm originated in China. As early as four or five thousand years ago, our ancestors planted mulberry and sericulture, which is recognized as one of the great discoveries in the world.
Domesticated from primitive silkworms that lived on mulberry trees in ancient times, they are homologous to wild silkworms that eat mulberry trees in China today, and both have 28 pairs of chromosomes. The development temperature of silkworm is 7-40℃, and the optimum feeding temperature is 20-30℃, which is mainly distributed in temperate, subtropical and tropical regions.
Silkworm is a completely metamorphosed insect, which has to go through four stages of development with completely different morphology and physiological functions: egg, larva, pupa and adult.
Eggs are the stage of embryogenesis and development to form larvae, larvae are the growth stage of feeding, pupae are the metamorphosis stage of the transition from larvae to adults, and adults are the reproductive stage of mating and spawning to reproduce offspring. The whole generation only eats in the larval stage, storing nutrients for the life activities of pupae and adults.