Location: Horticultural Crops Research2010 Annual Report
1a. Objectives (from AD-416)
To develop processing red raspberry cultivars that are adapted to the PNW that are machine harvestable. Additional traits to incorporate into new cultivars are RBDV resistance and root rot tolerance. To develop strawberry cultivars that are adapted to the PNW and that have higher picking efficiency than current industry standards. Additional traits to incorporate into new cultivars are: fruit firmness and disease resistance.
1b. Approach (from AD-416)
The principle breeding system used in the raspberry program will be recurrent mass selection in which the best individuals of each generation are intercrossed to form the next generation for selection. A recurrent mass selection system will be followed; the best individuals selected in each generation will be intercrossed to produce the next generation. Additional cultivars and selections from other programs will be added to the breeding population at any stage. Documents SCA with WSU. Formerly 5358-21000-031-17S (10/04). Formerly 5358-21000-036-10S (6/2008). Formerly 5358-21000-037-02S (8/2009).
3. Progress Report
In 2010, 86 raspberry crosses were made for cultivar development and germplasm purposes. An additional 20 crosses were made for research studies. Approximately 7,000 seedlings from 2009 crosses were planted in the field at WSU Puyallup. Fifty-six preliminary selections have been made among the 12,000 raspberry seedlings planted in 2007 and 2008. An additional 36 preliminary selections have been made among 2,100 seedlings planted with a cooperating grower. These seedlings were machine harvested and the 35 preliminary selections were made based on machine harvesting performance in a new attempt to identify machine-harvestability at the seedling stage. A trial to evaluate machine-harvestability of raspberry selections was established with a cooperating grower with 88 WSU selections, 8 BC selections, 1 ORUS selection and three reference cultivars. The machine harvested plantings established in 2007 and 2008 were evaluated weekly during the 2010 season. In the first two weekly harvests most plots had crumbly fruit or very soft fruit; however, one selection was noted for its non-crumbly, firm fruit during these harvests. Fruit quality in the plantings generally improved with later harvests, and the selection that performed well in the first two harvests continued to perform well and is slated to go through accelerated evaluation. This selection had been used as a parent in 2007 and seedlings from these crosses were evaluated for the first time in 2010. This selection was an excellent parent and represented as a parent in over 50% of the selections from the 2007 crosses. A replicated planting was established at WSU Puyallup of 11 WSU selections and 3 cultivars, which will be evaluated for the first time in 2012. Replicated root rot evaluation plots at WSU Puyallup have been planted in each of the last three years. These evaluations will provide information on field tolerance to severe levels of root rot. Selections were identified by graft inoculation by raspberry bushy dwarf virus (RBDV) that appear to be resistant to RBDV. Two WSU selections have been identified that appear to machine harvest well, are root rot tolerant and RBDV resistant. These two selections will be harvested in replicated plots in 2011. In 2010, 66 strawberry crosses were made. Seedlings from the 2009 crosses were planted in the field at WSU Puyallup. Thirty-two strawberry selections were made among the 5,100 strawberry seedlings planted in 2009. A planting with 24 non-replicated WSU selections, 6 replicated WSU selections and 10 cultivars were established at WSU Puyallup. The plantings established in 2008 and 2009 were harvested, but data has not yet been analyzed. Plants of a very large, productive, good-flavored selection were propagated via tissue culture and were planted with six cooperating growers in Oregon and Washington in 2009. Evaluations of the selection for the 2010 production season were positive. Dormant plants were also planted in 2010 by growers for testing. A recommendation will be sent to the cultivar release committee in late 2010. Methods of ADODR monitoring included stakeholder meetings, e-mail, lab visits and phone calls.