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- Author or Editor: F. J. Lawrence x
The genus Rubus has had considerable study, and reviews of the breeding work have been through (12, 68, 69, 76, 84). Although much progress has been made, all authors agree more is possible. This paper covers some of the successes, problems, and techniques used in the crossing of various species of Rubus. The basic chromosome number in Rubus is x = 7, and Rubus species range from 2x to 12x. Rubus species are found worldwide, from the tropics to above the Arctic Circle, offering a vast resource of germplasm for breeding purposes.
‘Benton’ is a vigorous, productive strawberry (Fragaria ananassa Duch.) that has had consistently good performance, especially for the fresh market, in the Willamette Valley of Oregon. It was named for Benton County, Oregon.
A wide range in ratio of the size of primary vs. secondary (P/S) berries was found in 17 cultivars and selections of strawberry (Fragaria x ananassa Duch.) Populations from 6 crosses of parents with low, intermediate, and high P/S indicated quantitative inheritance for P/S ratios. Some seedlings exceeded the upper and lower bounds of the range of either parent.
More than 300 red raspberry cultivars and selections were screened for raspberry (Rubus idaeus L.) bushy dwarf virus (RBDV), tobacco streak virus (TSV), and tomato ringspot virus (TomRSV) using enzyme-linked immunosorbent assay in three naturally infected breeding program selection plots at Corvallis, Ore. All genotypes tested negative for TSV and TomRSV. The RBDV incidence in primocane-fruiting cultivars and selections was 67%; in floricane-fruiting genotypes, it was 34%. The pattern of RBDV infection in the field showed no discernible trend. The high incidence may have been due to use of infected parents, propagation of infected genotypes, and pollen transmission. `Willamette', considered to be immune to the common strain of RBDV, along with 14 clones that had been in the field 10 years or longer, tested negative. The high incidence of RBDV in the breeding plots may provide an opportunity to identify resistant parents for breeding programs. An early seedling screening method for RBDV susceptibility is desirable to eliminate highly susceptible genotypes from the program and maintain a lower incidence of RBDV within the breeding plots.
‘Linn’ is a moderately vigorous and productive cultivar of strawberry (Fragaria ⨯ ananassa Duch.) with firm fruit for machine harvest or for a combination of machine and hand harvest. It was named for Linn County, Oregon, an area important in the early development of the strawberry industry in Oregon.