Effects of timing of CPPU applications on rabbiteye blueberries.

摘要

Field and greenhouse experiments were conducted at 2 locations in Georgia to determine how rabbiteye blueberries respond to different timings of application of the growth regulator (N-(2-chloro-4-pyridyl)-N'-phenylurea (CPPU)). In all tests, a CPPU rate of 15 mg l-1 was used, and timings of applications were based on days after flowering (DAF). Results indicated that a positive response in fruit set or berry size can occur with applications of CPPU depending on cultivar and timing of application. As with many growth regulators, the effect varied, and experiments indicated that the timing of CPPU application is critical for achieving the most desirable response. Collectively, data suggested that the optimum window for application of CPPU to rabbiteye blueberries is between 7 and 21 DAF, with the most probable success being achieved following an application made at 14 +or- 3 DAF.