Plant GallsLeaf Galls and Goldenrod Galls

Have you seen strange lumpy growths on plant leaves, or swollen stems, or shapes that imitate real plant parts, such as fake "apples" on an oak tree? They might be galls caused by tiny creatures such as wasps,  flies, aphids or mites.

Generally speaking, galls are a modification of plant tissue caused by an insect or mite for the benefit of that animal. Exactly how galls are formed is still very much a mystery!

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