Posted by Janicholson on October 25, 2013 at 16:43:13 from (74.60.94.18):
In Reply to: posted by Texasmark1 on October 25, 2013 at 15:08:00:
They are insect galls. They are formed by a small wasp (usually) that lays an egg in the meat of the leaf. The egg has the chemistry to control leaf cell growth. the tree grows a bump that the larva eats as it gets bigger. The larva eventually drill out of the gall and mature to fly away. The crusty stuff is insect poop. Google insect leaf gall images. Plenty of trees are infested. Jim
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