Title Suitable Conditions for Raising Silkworms

  • Gunma
Topic(s):
Regional Specialties
Medium/Media of Use:
Pamphlet
Text Length:
≤250 Words
FY Prepared:
2019
Associated Tourism Board:
Fujioka City
Associated Address:
237 Takayama, Fujioka-shi , Gumma

蚕の好む環境

蚕は、幼虫(いも虫)期には、齢と呼ばれる5つの成長段階を通して発達し、その後、繭を作る。蚕は非常に傷つきやすく、温度や湿度の変化に順応する能力を欠いており、ほとんど動くことができない。良質の繭をまとめて生産するためには、蚕農家は養蚕室の温度と湿度に細心の注意を払う必要がある。以下の表は、各成長段階(齢)における理想的な温度と湿度を示す。


理想的な温度(℃)

理想的な湿度(%)

1齢(1~4日目)

26~28℃

80~90%

2齢(5~12日目)

26~28℃

80~90%

3齢(13~19日目)

24~25℃

70~80%

4齢(20~26日目)

22~24℃

65~75%

5齢(27~35日目)

22~23℃

60~70%

Suitable Conditions for Raising Silkworms

Silkworms progress through five stages of growth, called instars, during their larval or “worm” phase before they create their cocoons. Silkworms are quite fragile—they lack the ability to adapt to changes in temperature or humidity and can barely move. In order to achieve a successful batch of cocoons, silkworm farmers need to pay careful attention to the temperature and humidity in their nurseries. The table below shows the ideal temperature and humidity for each stage of growth, or instar.


Ideal temperature (°C)

Ideal humidity (%)

First instar (days 1–4)

26–28

80–90

Second instar (days 5–12)

26–28

80–90

Third instar (days 13–19)

24–25

70–80

Fourth instar (days 20–26)

22–24

65–75

Fifth instar (days 27–35)

22–23

60–70

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