mulberry tax桑税mulberryn.桑树；桑葚；深紫红色mulberry sapling production桑苗繁育mulberry silkworm egg shell蚕退纸mulberry concentrated juice桑椹浓缩汁Mulberry germplasm resource桑树品种资源mulberry-feeding silkworm桑蚕Mulberry ring spot nepovirus桑树环斑线虫传多角体病毒mulberry germplasm resources新疆桑种质资源Mulberry-silkworm ecosystem蚕桑生态系统Mulberry mosaic dwarf disease桑花叶型萎缩病Mulberry yellow net vein virus桑树黄网脉病毒