Location: Horticultural Crops Research2012 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:
This project will develop new red raspberry cultivars adapted to the PNW that are machine harvestable and suitable for processing. Important traits like resistance to raspberry bushy dwarf virus (RBDV) and tolerance to root rot are also being pursued for new raspberry cultivars. Once raspberry seedlings are selected, they are then planted in small plots with a cooperating grower and evaluated for machine harvestability. Selections that appear to machine harvest are tested for yield, fruit size, and fruit firmness in replicated trials at WSU Puyallup and also evaluated for susceptibility to root rot and raspberry bushy dwarf virus. Selections possessing several promising traits are propagated into quantities suitable for grower trials. In 2012, a new machine harvesting planting was established with 90 WSU selections, 10 BC selections and the cultivars Meeker and Willamette as standards for comparison. This planting will be machine harvested and evaluated in 2014 and 2015. The 2009 planting will be evaluated for the second season in 2012. The planting established in 2010 will be evaluated for the first season in 2012. Promising selections in each planting will be identified and propagated for further testing. Sixty-two preliminary selections have been made among the 7,200 raspberry seedlings evaluated at WSU Puyallup in 2012, with additional selections possible. Additional observations of root rot and RBDV susceptibility/resistance among advanced selections have led to the identification of some selections that are machine harvestable, root rot tolerant and RBDV resistant. Three WSU selections were planted in grower trials with up to 550 plants of each selection planted at six sites. The project will also develop new strawberry cultivars adapted to the PNW and that have higher picking efficiency than current industry standards. Additional aims for new strawberry cultivars are fruit firmness and disease resistance. Ongoing strawberry breeding work is focusing on parents with large fruit size, firm fruit and high productivity. Twenty-two selections were made in 2012 among the 3,200 seedlings planted in 2011. These selections will be propagated for planting in yield plots in 2013. The selection trials planted in 2010 and 2011 were harvested in 2012. Selections with promise will be propagated and planted in a new selection trial for additional evaluation. This research was conducted in support of objective 1B of the parent project.