Mature larvae usually leaves the victim or the back of the leaves, petioles, veins and weeds on a thin silk cocoon so pupation, pupal stage 5-15 days.

老熟幼虫一般在被害叶片背面或枯叶、叶柄、叶脉及杂草上吐丝做薄茧化蛹，蛹期5 - 15天。

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Juxian is the largest silkworm production base, gaining the top position of the province for its silk cocoon in both quantity and quality for serial years.

莒县是山东省最大的桑蚕生产基地，蚕茧产量质量连续五年全省夺冠。

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The utility model discloses a steam heating device for rereeling machines and silk cocoon reeling machines in silk industry, mainly composed of a steam input tube and a condensation returning tube.

本实用新型公开了一种用于丝绸业中复摇机、缫丝机的蒸汽加热装置。

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The silk was engineered by Tufts University, near Boston, from a silkworm cocoon that had been boiled to create a silk solution that can be deposited as a thin film.

ECONOMIST: Bioelectronics