Chemical control of weeds in deciduous fruit trees.
Pre-emergence treatments with the residual herbicides propyzamide + simazine, methazole + napropamide, or oxadiazon, and the contact herbicides diquat + paraquat controlled weeds in almond, apple, apricot, cherry, peach, pear and plum orchards without affecting yield, fruit size or fruit weight when compared with cultivated controls. In addition, terbacil was effective in peaches, and terbuthylazine + terbumeton in apples. Resistant weeds (including Convolvulus arvensis and Cynodon dactylon) and tree suckers were adequately suppressed or eliminated by glyphosate. No treatment caused visual toxicity to the trees. All herbicide treatments except oxadiazon were more economic than cultivation.