Several annual and perennial weed species were effectively controlled with 3-tert-butyl-5-chloro-6-methyluracil (terbacil) in orchards. One-year-old seedling rootstocks of peach, Prunus persica , (L.) Patsch, were most tolerant to terbacil; pear, Pyrus communis , L., and apple, Malus sylvestris , L., seedlings were intermediate; the East Malling (EM) VII clone, Mazzard, Prunus avium , L., and Mahaleb cherry, Prunus mahaleb , L., seedlings were most susceptible. Both surface and soil incorporated applications were toxic, indicating that terbacil was readily leached into the root zone. Applications were made in 2 and 6-year-old experimental blocks and in commercial orchards (age 2–15 years) from 1965 to 1968. No major damage was observed on apple, peach, tart cherry or sweet cherry trees that were established 3 years or longer. Toxicity symptoms manifested as veinal chlorosis were occasionally observed on sandy loam soils at rates 2–3 fold greater than required for satisfactory weed control.
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Putnam et al. (1969) studied this question.