No clues personally, but found some interesting tid-bits...
Clipped from here >
https://docs.google.com/viewer?a=v&q=cache:qnFiBBClZ5IJ:www.extension.iastate.edu/Publications/IC417.pdf+clearing+leaf+gall+from+a+pin+oak+tree&hl=en&gl=us&pid=bl&srcid=ADGEESjyk--8YWkgeQeCyrZ-6XscBukeObPlTEPn1Mh9fnK_v54noi2H3TducNhOnSNXwgc2SkUGhTQWDMXe7F8ZhgDEgMBuxR6ZMzre8AEnF4OgFU_WhNzIcATfVrKApPEPmBTf4VIE&sig=AHIEtbR0nGdgCjrbHbIJecS5HWsv8fm3qg
Succulent oak gall- {gall maker > Wasp}. Green succulent globular leaf gall resembling a
grape or gooseberry on pin oak. Hollow with loose kernel, 5 to 12 mm in diameter.
Spray as leaves are expanding in the spring.
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Folk remedies from earlier times frequently included galls. Also, because the formation
of galls was not understood, they were thought to be supernatural and possessed with
future-telling powers. Dyes and inks have been obtained from galls over the past several
centuries. In more recent times, galls have been used in the production of tannic acid.
In certain instances, galls have been used as sources of food, probably because of their
high starch and sugar content.
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Because most galls do not seriously affect trees,controls are not usually necessary. Also,
galls cannot be “cured” after they have formed and spraying the galls does not make them
go away. Preventive treatments must be applied before the galls form and properly timed to
coincide with the development of the plant and the attack by the gall maker. Although
treatment may be effective, it is usually not practical. The appropriate time to treat will
vary considerably from year to year and from place to place, making good control more a
matter of luck than skill.
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If it comes down to it...a roaring romantic fire should even your odds with the Mrs