yollow leaf blotch

例句：

1. 1. The leaves on the trees are turning yellow, revealing a blotch of green where the branches meet.
   树木的叶子正在变黄，在树枝交汇的地方出现了一片绿色。
2. 2. The yellow leaf blotch is caused by a fungus that attacks the tree's bark.
   黄色叶斑是由一种真菌引起的，这种真菌攻击树皮。
3. 3. The farmer noticed the yellow leaf blotch on the apple tree and suspected it was due to a disease.
   农民注意到苹果树上的黄色叶斑，怀疑这是由于某种疾病引起的。