Performance of the 1984 NC-140 cooperative peach rootstock planting

In 1984, trees of 'Redhaven' peach [Prunus persica (L.) Batsch] on 9 rootst ocks were planted at 16 sites in North America according to guidelines esta blished for cooperative testing by the North Central Regional Cooperative P roject (NC-140). After 7 years, tree loss was greatest on 'Citation' (52%) and 'Damas 1869' (32%). Survival was greatest for trees on 'Bailey,' 'Halfo rd' and own-rooted 'Redhaven.' Tree loss was greatest at the Ohio and Kentu cky sites, due primarily to winter damage and heavy soil conditions, respec tively. Trees on 'GF 677' were the most vigorous and those on 'Citation,' ' GF 655-2' and 'Damas 1869' were the least vigorous. Greatest cumulative yie ld was experienced on 'GF 677: 'Halford,' 'Bailey,' 'Siberian C' and own-ro oted 'Redhaven.'