UNIVERSITY OF CALIFORNIA, DAVIS PUBLIC STRAWBERRY BREEDING PROGRAM 16DN9 ANNUAL FIELD DAY DAY-NEUTRAL CULTIVAR ADVANCEMENT & RESEARCH UPDATE SANTA MARIA 5 APRIL 218 & OXNARD 6 APRIL 218 Steven J. Knapp (sjknapp@ucdavis.edu); Glenn Cole (gscole@ucdavis.edu); Julia Harshman (jharshman@ucdavis.edu) HIGHEST YIELDING CULTIVAR. 16DN9 was the highest yielding cultivar across 215-16 and 216-17 field trials, ranking first in every location by year combination. marketable yield of 16DN9 was 14-24% greater than and 63-69% greater than over locations and years (Table 1; Figures 1-2). LESS RUNNER TRIMMING, LOWER PRODUCTION COSTS. 16DN9 produces significantly fewer runners than and, which should translate into lower production costs (less runner trimming). LONG SHELF-LIFE & GOOD FRUIT QUALITY. The fruit quality and shelf-life of 16DN9 appear to be on par with and assessments are currently underway and will be reported at the end of the season. 16DN12 HIGHLY RESISTANT TO FUSARIUM WILT. 16DN12 is resistant to Fusarium wilt, whereas 16DN9 and 16DN11 are susceptible (Table 2). THIRD HIGHEST YIELDING CULTIVAR. 16DN12 was the third highest yielding cultivar across 215-16 and 216-17 field trials (Table 1; Figures 1-2). The cumulative marketable yield of 16DN12 was equivalent to 16DN11 and 6-9% less than 16DN9 across locations and years. marketable yield of 16DN12 was 7-12% greater than and 54% greater than across locations and years (Table 1; Figures 1-2). LESS RUNNER TRIMMING, LOWER PRODUCTION COSTS. Similar to 16DN9, 16DN12 produces significantly fewer runners than and, which should translate into lower production costs (less runner trimming). LONG SHELF-LIFE & GOOD FRUIT QUALITY. The fruit quality and shelf-life of 16DN9 appear to be on par with and.
!2 16DN11 EARLY PRODUCER & ROBUST GROWER. 16DN11 produced fruit 1-2 weeks earlier than the other cultivars tested, and has been the most robust and healthy cultivar in low-input production systems. SECOND HIGHEST YIELDING CULTIVAR. 16DN11 was the second highest yielding cultivar across across 215-16 and 216-17 field trials (Table 1). The marketable yields of 16DN11 was equivalent to 16DN12 and 2-9% less than 16DN9. marketable yield of 16DN11 was 1-12% greater than and 54-6% greater than across across locations and years (Table 1; Figures 1-2). LONG SHELF-LIFE & GOOD FRUIT QUALITY. The fruit quality and shelf-life of 16DN11 appear to be on par with and. Fruit quality and shelf-life assessments are currently underway and will be reported at the end of the season. TABLE 1. Cumulative marketable yields for three experimental cultivars (16DN9, 16DN11, & 16DN12) and two check cultivars ( and ) tested in Santa Maria and Prunedale, CA in 215-216 and 216-217, where marketable fruit yield = total fruit yield percent marketable fruit. Cultivar 216 Fruit Yield (g/plant) 217 Fruit Yield (g/plant) Percent Fruit Yield Increase Over Yield Increase Over 16DN9 1,851 2,469 87-88% 63-69% 14-24% 16DN11 1,69 2,419 84-86% 54-6% 11-14% 16DN12 1,689 2,331 87-89% 53-54% 7-13% 1,489 2,175 86-87% 35-43% 1,96 1,511 79-82%
!3 y^ = 8 +.72 x, r 2 =.44 16DN9 Prunedale Yield (g/plant) 2,5 2, 1,5 16DN3 16DN12 16DN11 16DN37 16DN1 16DN44 16DN28 16DN26 16DN25 16DN19 16DN22 16DN45 16DN62 16DN21 16DN35 16DN34 16DN23 16DN15 16DN14 16DN31 Fronteras 16DN13 16DN55 16DN54 16DN56 Petaluma Portola 16DN72 Grenada 1, 1, 1,5 2, 2,5 Oso Flaco Yield (g/plant) 216-217 Yield (g/plant) 2,5 2, 1,5 1, 16DN72 16DN9 16DN11 16DN44 16DN22 16DN1 16DN23 16DN31 16DN37 16DN19 16DN14 16DN55 16DN34 16DN26 16DN45 16DN15 16DN13 Portola 16DN21 16DN3 16DN28 16DN25 16DN35 16DN56 Fronteras 16DN62 Petaluma 16DN54 Grenada 16DN12 8 12 16 2 8 1,2 1,6 2, 215-216 Yield (g/plant) FIGURE 1. Cumulative marketable yields (g/plant) of cultivars tested in Santa Maria and Prunedale, CA in 216 and 217. The upper panel shows least square means across years with standard errors displayed as red crosses. The lower panel shows least square means across locations with standard errors displayed as gray crosses.
!4 FIGURE 2. yields (g/plant) for individual harvests (upper panel) and cumulative marketable yields (g/plant; lower panel) of cultivars tested in Santa Maria and Prunedale, CA in 216 and 217. The points are least square means at each harvest (upper panel) or summed over harvests (lower panel). 16DN12 16DN9 16DN11 Apr May Jun Jul Aug Sep Apr May Jun Jul Aug Sep 5 1 15 5 1 15 5 1 15 Fruit Weight (Grams / Clone) 216.Oso_Flaco 216.Prunedale 217.Oso_Flaco 217.Prunedale 16DN12 16DN9 16DN11 Apr May Jun Jul Aug Sep Apr May Jun Jul Aug Sep 1 2 1 2 1 2 Fruit Weight (Grams / Clone) 216.Oso_Flaco 216.Prunedale 217.Oso_Flaco 217.Prunedale
!5 TABLE 2. Fusarium wilt, Verticillium wilt, Phytopthora crown rot, and Macrophomina (charcoal rot) resistance scores for day-neutral cultivars screened in artificially inoculated fields in Davis, CA in 215-216, 216-217, and 217-218, where 1 = highly resistant, 2 = resistant, 3 = intermediate, 4 = susceptible, and 5 = highly susceptible. Experiments are currently underway to assess Phytopthora crown rot resistance. Cultivar Fusarium Wilt Verticillium Wilt Phytopthora Crown Rot Macrophomina 16DN9 4.5 3.5 TBD 5. 16DN11 4.5 3.6 TBD 5. 16DN12 1.3 2.7 TBD 5. 4.4 2.6 TBD 5. 4.5 2.6 TBD 4.5