Abstract: A process of propagating woody plant material of apple, plum or cherry in vitro includes setting a shoot on a nutrient medium including a cytokinin, an auxin and a phenolic compound to produce a number of shoots, excising these shoots and allowing them to multiply again as the same medium any desired number of times, excising individual shoots and rooting these on the same or a similar nutrient medium but from which the cytokinin is omitted and finally growing the resulting plants on.

Abstract: This invention relates to a new and distinct variety of cherry tree useful as a dwarfing cherry rootstock. The new variety originated as a seedling by crossing pollen from Prunus pseudocerasus Lind. onto flowers of Prunus avium L. F 299/2. Cherry trees on the understock of this variety are approximately 50 percent of the size of like cherry trees on F 12/1 understock. Also, this variety induces higher fruit bud production on the scion on this rootstock in the early life of the grafted cherry tree than if grafted on F 12/1 understock, thus giving heavier cherry crops earlier in the life of the grafted tree.

Abstract: The invention relates to a new and distinct variety of plum tree which is useful as a dwarfing rootstock. Plum trees grown on the understock of this variety attain about two-thirds of the size as those on St. Julien A understock, and are more precociously bearing thereby manifesting a greater cropping efficiency. Also, hedges of this variety exhibit a more spreading habit in contrast to the vigorous upright shoots of St. Julien type rootstocks, and are resistant to bacterial canker.

Abstract: The invention relates to a new and distinct hybrid Rubus variety which has been designated the Tayberry. The subject variety was formed by the crossing of the octoploid blackberry Aurora with a tetraploid raspberry pollen parent known as 626/67. This variety resembles the Loganberry in some respects, but is superior to it with respect to fruit size, yield, fruit color, mode of presentation of fruit, and ease of propagation by root cuttings.

Abstract: The invention relates to a new and distinct variety of cherry tree useful as a cherry rootstock for supporting ornamental flowering cherry cultivars. The new variety originated as a seedling by crossing Prunus avium L. F299/2 and Prunus pseudocerasus Lind. It has been found that ornamental cherry cultivars, and in particular Yukon, grow more vigorously on the new variety during the first six years than on Prunus avium F12/1 and various inter- and intra-specific hybrids. THe resulting thick trunk formation and the resulting precocious formation of blossoms by the ornamental cherry cultivar are particularly appealing to nurserymen.

Abstract: The invention relates to a new and distinct hybrid Rubus variety which has been named the Tummelberry. The subject variety was formed by crossing seedling 69102/18, an unnamed hybrid bred at the Scottish Crop Research Institute, with the Tayberry as pollen parent. The variety resembles the Tayberry in some respects, but differs from it in the flavor, size, shape and color of its fruit, in the season of ripening and in the intensity of red pigments present in the stems and leaves.

Abstract: A new and distinct variety of ornamental crab apple tree is provided which xhibits an extremely columnar growth habit which generally resembles that of a vertical pole. The foliage is dense and compact and side branches are substantially absent. The new variety yields attractive crimson fruit which is suitable for making jelly. The young leaves are purple tinted.

Abstract: A new and distinct variety of apple tree is provided which exhibits an extremely columnar growth habit which generally resembles that of a vertical pole. The foliage is dense and compact and side branches are substantially absent. The new variety yields medium-sized asymmetric generally round-conical fruit having a yellow-green skin coloration bearing a substantial quantity of red flush. The unique growth habit makes possible plantings of extremely high density with concomitant increased fruit yields per planting area.

Abstract: A new and distinct variety of apple tree is provided which exhibits an exmely columnar growth habit which generally resembles that of a vertical pole. The foliage is dense and compact and side branches are substantially absent. The new variety yields medium-sized asymmetric generally flat round fruit having a yellow-green skin coloration which is partially overlaid with light orange. The unique growth habit makes possible plantings of extremely high density with concomitant increased fruit yields per planting area.

Abstract: A new and distinct variety of apple tree is provided which exhibits an exmely columnar growth habit which generally resembles that of a vertical pole. The foliage is dense and compact and side branches are substantially absent. The new variety yields medium-sized asymmetric generally round-conical fruit having a yellow-green skin coloration which is partially covered with a red flush having prominent lenticels. The unique growth habit makes possible plantings of extremely high density with concomitant increased fruit yields per planting area.