working on flower bud formation mechanisms of blueberry, I need to know about previous works on effect of CPPU, and auxin inhibitors on flower bud production in blueberries.
I attached few pdfs they might help u to solve your problem.
The growth regulator CPPU [N-(2-chloro-4-pyridyl)-N- phenylurea] has recently been shown to increase both fruit set and berry size in rabbiteye blueberries (Vaccinium ashei Reade) June 2017 and southern highbush blueberry (2007).
We have used CPPU on our Rabbiteye blueberries to increase fruit set and size with good results. We are also trialing it in highbush as in the attached paper.