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I discovered Oak Leaf Blister today on a client's Live Oak. This hasn't been a bad year for the disease. This disease is favored by cool, moist conditions when the leaves are coming out. The "blisters" will turn brown as the season progresses. Severe infections may cause the leaves to fall. The disease rarely warrants control. Once symptoms develop, fungicides are ineffective for the current season. They can be apply as a preventative the following year to lessen the severity.

In the summer of 2012, Sam Hill, founder of Sam Hill Tree Care, earned the Board Certified Master Arborist certification through the International Society of Arboriculture (ISA). 

The ISA Board Certified Master Arborist credential is the highest level of certification offered by ISA. This credential recognizes ISA Certified Arborists who have reached the pinnacle of their profession. In addition to passing an extensive scenario-based exam, candidates must abide by a Code of Ethics which ensures quality of work. Fewer than two percent of all ISA Certified Arborists currently hold this certification.

It's a familiar scene in North Texas landscapes.  Somebody in the front yard with a pair of loppers decapitated 'Ms. Myrtle'. 

Possible motives? 

Family history-  "Dad always did it that way."
Envy-  "But the Jones do that every year."
Vanity-  "They flower more, right?"
Greed-  "It will give the crew something to do."
Napoleon Complex-  "They are too tall."

With the exception of the last one, none of these motives are legitimate causes for crapemurder.

Surveys of landscape professionals indicate that most people prefer more natural pruning that enhances the natural growth habit of the tree.  Sorry, Dad.

In addition, studies show that unpruned crapemyrtles tend to have more, albeit smaller, blooms.  Heavily pruned trees have larger blooms but fewer of them.

If the crapemyrtle is too big for the location, please have the decency to make it a quick death.  Then visit this Texas A&M Crapemyrtle website  for suggestions on varities that won't grow too big for the site where you want them.