Reductions in weed interference achieved through hand weeding or herbicides in a newly planted peach (Prunus persica (L.) Batsch) orchard led to increased summer growth and greater freezing resistance of bark and wood tissue in dormant scions. Controlled freezing tests for 2 winters following spring plantings indicated that bark and xylem tissues of scions from weed-free plots averaged 5.5° and 3.2°C more cold hardy, respectively, than those from unweeded plots.
Received for publication August 27, 1979.