This is your problem: hibiscus sawflies, or Atomacera decepta.
You might see these insects on the leaves; that’s a sign that you’re being attacked. Females lay eggs on the leaves, the hatch and start eating on the underside, usually in July. The University of Maryland suggests this: Handpick larvae or prune out affected tissue and destroy. If the population is too big, or the plant is too tall to hand-pick, treat with Conserve, an insect control produce.
This is your problem: hibiscus sawflies, or Atomacera decepta.
You might see these insects on the leaves; that’s a sign that you’re being attacked. Females lay eggs on the leaves, the hatch and start eating on the underside, usually in July. The University of Maryland suggests this: Handpick larvae or prune out affected tissue and destroy. If the population is too big, or the plant is too tall to hand-pick, treat with Conserve, an insect control produce.