Puccinia orbicula

例句：

1. 1. The fungus Puccinia orbicula is responsible for the black spots on apple trees.
   黑穗菌是导致苹果树上黑色斑点的原因。
2. 2. The plant Puccinia orbicula is a common weed in many areas.
   植物黑穗菌在许多地区是一种常见的杂草。
3. 3. In agriculture, Puccinia orbicula is used to control the growth of certain pests.
   在农业中，黑穗菌被用来控制某些害虫的生长。