Strange Homes Built on Plant Leaves — Insect Galls
- 演化之聲
- Mar 15
- 5 min read
When walking outdoors, you may sometimes notice strange structures appearing on plant leaves. Such unusual swellings can arise from various causes. In some cases they are produced by infections from viruses, bacteria, or fungi. In other situations, organisms such as nematodes or arthropods—including insects—can also trigger the formation of bizarre structures on plants. Among these possibilities, the structures induced by insects are often the most striking, because they display an astonishing diversity of shapes and forms. Some are even visually beautiful. These structures are known as insect galls.
Insect galls can develop on leaves, stems, flowers, fruits, or roots of plants. They arise when insects manipulate the development of local plant tissues. The process may begin when an insect inserts an ovipositor into plant tissue, secretes saliva while feeding, or deposits excretions on the plant surface. Through these interactions, chemical substances produced by the insect are transferred into plant cells. These compounds disrupt the normal growth program of plant tissues, causing cells in the affected region to grow or proliferate abnormally. As a result, the plant forms protruding structures that often resemble fruits or flower buds.
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