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紫胶是一种珍贵的工业原料,是Lacciferlacca Kerr的分泌物,因颜色呈紫红色,故叫紫胶,也叫虫胶。紫胶蚧一年发生两代,每年4月下旬至10月初为第一世代,常称夏代;自10月至翌年4月底为第二世代,常称冬代。夏代胶在我国亚热带地区都能生产,冬代胶则局限于我国北热带及南亚热带南部的部分地区。冬代胶不但作为一代紫胶生产,更重要的是保种过冬,以供应夏代生产的种源,没有冬代生产的种胶,就不能进行夏代生产。
Lac is a precious industrial raw material, Lacciferlacca Kerr secretion, because the color is purple, so called shellac, also known as shellac. Purple gecko occurs two generations a year, from late April to early October each year for the first generation, often referred to as the summer; from October to the end of April the following year for the second generation, often called the winter. Xia Dai glue can be produced in the subtropical regions of our country, the winter glue is limited to China’s northern and southern subtropics in southern parts. Winter plastic glue not only as a generation of shellac production, more important is to preserve the winter, to supply the provenance of the summer production, there is no production of gelatin in the winter, it can not be produced in the summer.