ʻōhiʻa psyllid galls

ʻŌhiʻa lehua (Metrosideros polymorpha) is the most common native Hawaiian tree. Galls left by insects occasionally disfigure its leaves. Adult female psyllids (jumping plant lice) lay eggs inside the leaves. When the nymphs hatch, they feed on the leaf from the inside, secreting substances that stimulate abnormal plant growth and form galls. More...