Also, plants producing edible fruit and serving as landscape plants require more regular spraying to produce quality fruit than most people want to provide. For these homeowners, there are several ways to remove fruit or prevent fruiting. This may not be practical for large trees or extensive plantings of shrubs. The most practical method for these is to use hormone-type foliar sprays. For example, crabapple versus mulberry, or Dolgo Crab versus Sargent's Crab.
Correct concentration is crucial.
Too low of a concentration can increase fruit set. Too much may cause leaf and stem injury. Hormone effect is influenced by both weather conditions and time of application. Be sure to follow label directions . Do not exceed recommended amounts.