Infestations of Oak Marble Galls
Removing and destroying galls before they dry and the wasps emerge from a hole may help to reduce the infestation. While fairly large, spectacular, and sometimes present in quite large numbers, they cause no measurable harm. The galls were the subject of considerable Press controversy in the mid-nineteenth century when it was thought that the acorn crop would be ruined and its rapid spread would deprive farmers of valuable pannage (fodder) for their pigs.
Read more about this topic: Andricus Kollari
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—Ralph Waldo Emerson (1803–1882)