LEAF GALLS CAUSE NO PERMANENT HARM

From: Evansville Courier & Press | Date: June 11, 2006| Author: | Copyright information

Naturalist and philosopher Henry David Thoreau once said, "Almost every shrub and tree has its gall." And for the most part, he was correct. Galls are abnormal plant growths caused by various organisms (insects, mites, nematodes, fungi, bacteria and viruses), and nearly all plants get one type of gall or another.

Gall-making parasites release growth-regulating chemicals as they feed, causing adjacent plant tissues to form a gall. The parasite then develops within the relative security of the gall. Several different groups of insects and one family of mites have developed the ability to ...

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