Using Plant Growth Regulators to Eliminate Nuisance Fruits in Ornamental Trees
Numerous ornamental tree species have fruit-bearing characteristics that make them undesirable, especially when thetrees overhang sidewalks, driveways and streets. Among other problems, nuisance fruits create slipping hazards forpedestrians. City park departments are especially concerned about such fruits, as they are liable for injuries caused bytrees growing in city easements.
A number of trials were conducted in early to mid-1990s to determine the effectiveness of ethephon and NAA (naphthaleneacetic acid) in eliminating the fruits of several commonly planted ornamental trees. At the time of the trials,relatively few species could be legally treated for fruit elimination in California; NAA was registered for eliminatingolive (Olea europaea), pear (Pyrus spp.) and plum (Prunus spp.) fruits, ethephon for eliminating appleand crabapple (Malus spp.), carob (Ceratonia siliqua), and olive fruits, and mefluidide for eliminating olivefruits. This report summarizes
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