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Abstract
Several herbidices were evaluated over a 2-year period as early and late postemergence teratments applied to low-statured blueberry plants (Vaccinium angustifolium × V. corymbosum L.) growing in a low-organic matter soil in northern Minnesota. Good to excellent control of quackgrass (Agropyron repens (L.) Beauv.) was obtained with both terbacil [3-tert-butyl-5-chloro-6-methyluracil] and glyphosate [N-(phosphonomethyl)glycine]. The annual broadleaf weed complex was effectively controlled by simazine [2-chloro4,6-bis(ethylamino)-s-triazine] and terbacil. Glyphosate controlled quackgrass the most consistently. Terbacil, through root absorption, and glyphosate and paraquat [1,1’-dimethyl-4,4’-bipyridinium ion], by foliage contact, injured the blueberry plant.
Abstract
Roots of ‘Mailing (M) 26’ and ‘Malus robusta (MR) 5’ were less hardy than stems in winter; hardened more slowly in fall; and dehardened later in spring. In 1967 roots were hardier than in 1968, despite slightly higher soil temperatures. This difference in hardiness was associated with much less rainfall in 1967 leading to a lower level of root hydration. While overall soil temperature-hardiness relationships were unclear, short-term changes in root hardiness were correlated with soil temperature during the preceding week. Hardening in apple roots appeared to be influenced by soil temperature and level of root hydration.
Abstract
Three new cultivars of apple (Malus domestica Borkh.) were released for public nursery sales in 1978 and 1979 as products of an ongoing long-term breeding program at Minnesota (Table 1).
Abstract
‘Scott’ is a vigorous and productive strawberry cultivar (Fragaria X ananassa Duch.) with firm, large fruit. Named for Donald H. Scott, former USDA strawberry breeder known internationally for breeding disease-resistant strawberries, this is the latest in a series of cultivars resistant to red stele root rot and bred for culture in the eastern United States by the U. S. Department of Agriculture and the University of Maryland.
Abstract
‘Summercrisp’ is a cold-hardy, early-season pear (Pyrus spp. L.) cultivar introduced by the Univ. of Minnesota for use in cold climates where most pear cultivars grow poorly and do not fruit consistently. The name ‘Summercrisp’ connotes the early harvest season and that the fruit is best consumed without ripening, while the flesh is firm and crisp.
Abstract
‘Redwing’ is a primocane-fruiting (“fall-fruiting”) red raspberry (Rubus idaeus L.) cultivar (Fig. 1) developed by the Univ. of Minnesota fruit breeding program. It typically begins fruiting 10 to 14 days earlier than ‘Heritage’, the most widely grown commercial primocane-fruiting cultivar. ‘Redwing’ is intended to supplement or replace ‘Heritage’ in situations where earlier primocane fruiting is desired.
Abstract
‘Alderman’ is a large, sweet, cold-hardy, Japanese-type plum hybrid involving Prunus salicina Lindl. and P. americana Marsh. It is being introduced by the Univ. of Minnesota Agricultural Experiment Station for use in cold climates where other high-quality, Japanese-type plums may suffer winter injury. ‘Alderman’ was named after W.H. Alderman in commemoration of his 100th birthday in 1985 and in recognition of his many accomplishments as a scientist and administrator in horticultural science at the Univ. of Minnesota.
Abstract
A blueberry (Vaccinium spp.) breeding program was initiated at the Univ. of Minnesota in 1967 using V. corymbosum L. and V. angustifolium Ait. and hybrids between the species. The objective was to develop low-saturated, high-quality, cold-hardy cultivars for commercial as well as home garden use (3). ‘Northblue’, ‘Northsky’, and ‘Northcountry’ are the first cultivars introduced from this program.