微小的黄蜂在明尼苏达的树上造成无害的叶胆 夏末秋落 Tiny wasps cause harmless leafy galls on Minnesota trees, appearing late summer to fall.

明尼苏达州居民注意到树上挂着不寻常的叶子球, Residents in Minnesota have noticed unusual leafy spheres hanging from trees, sparking curiosity online. 专家证实这些是小黄蜂在树枝上产卵所引起的胆汁. Experts confirm these are galls caused by tiny wasps laying eggs on tree branches. 昆虫刺激这棵树形成 保护性的圆形生长 容纳正在发育的幼虫 The insects stimulate the tree to form protective, round growths that house the developing larvae. 这种现象对树木无害,通常在夏末至初秋出现。 The phenomenon is harmless to the trees and typically appears in late summer to early fall. 没有任何入侵物种或环境威胁与胆量相关联,它们自然在冬季落下。 No invasive species or environmental threats have been linked to the galls, and they naturally fall off in winter.