Seventeen strawberry (Fragaria ×ananassa Duchesne) cultivars and six selections were tested under greenhouse conditions for susceptibility to leaf spot induced by Mycosphaerella fragariae (Tul.) Lindau. The level of susceptibility was evaluated based on maximum disease severity and area under the disease progress curve (AUDPC). The 23 genotypes were ranked based on AUDPC and grouped according to their susceptibility. Cluster analysis for AUDPC gave four groups corresponding to low, moderate, high, and very high susceptibility to leaf spot. `Annapolis', `Chambly', `Glooscap', `Redcoat', and `Veestar' consistently showed a low level of susceptibility. The selections SJ89700-1 and SJ8518-11 and `Tribute' showed a very high level of susceptibility, and the remaining cultivars were grouped as either moderately or highly susceptible.
Environmental variance components were estimated for calyx-end fruit cracking in pollination-constant and nonastringent cultivars and selections of Japanese persimmon (Diospyros kaki Thunb.). The cracking value of a tree in a cultivar or selection (genotype) (X) was evaluated as the number of fruit that cracked divided by the total number (25) of fruit evaluated from each tree. Because the mean value of X was correlated with the variance of X, analyses of variance were performed using its square root value. The variance associated with genotyp× year interaction was the largest of environmental variance components. The variances associated among years and among trees within genotypes were very small. The mean percentage of cracked fruit in evaluation for 10 years was 3% for `Fuyu', 11% for `Matsumotowase-Fuyu', and 12% for `Izu'. On the basis of the environmental variance components obtained, it is proposed that all offspring genotypes exhibiting a phenotypic cracking incidence of less than 20% and 11% should be selected in single-year and three-year evaluations, respectively, when those genotypes are evaluated using 25 fruits from a single tree, in order to successfully select all genotypes with an genotypic incidence of less than 3%.
selected as parental breeding materials. No information is available about the relative salinity tolerance of these elite, turf-type saltgrass selections. The objective of this study was to screen salinity tolerance and determine the level of salinity
inquiries from the landscape and nursery industry regarding two pink-fruited blueberry selections in its test plots. Because of this interest, the U.S. Department of Agriculture, Agricultural Research Service has released these selections for evaluation
selections in Florida and found three of them to be highly female sterile. Female sterile porterweed included the following: ‘Violacea’ porterweed ( Stachytarpheta mutabilis ), ‘Naples Lilac’ porterweed ( S . cayennensis × S . mutabilis ‘Violacea’), and
that variation exists in onion germplasm for resistance to onion thrips and IYS. By performing selections on this germplasm, it may be possible to enhance the level of IYS resistance. This study was undertaken to determine if selected onion populations
higher branch production and lower blind node incidence than FG × ‘Tardy Nonpareil’ almond (TNP) hybrids. Two selections from P. kan F 1 : seedling number 3 [chilling requirement 300 chill units (CU)] and seedling number 6 (300 CU), and one selection from
commercial rootstocks. Traditional selection procedures used to detect tolerance to iron chlorosis are based on field evaluation ( Socias i Company et al., 1995 ). However, this practice requires long evaluation periods, is time consuming, and is very
., 2005 ). The association of production components with the soluble solids content in cherry tomatoes allows the selection of promising genotypes ( Araújo et al., 2016 ; Sánchez et al., 2019 ). Because of the high demand and the search for new hybrids
Tomes, 1943 ; Jun et al., 2010 ; Okie and Weinberger, 1996 ). Therefore, evaluating pollen viability among cultivars is an important process in the selection of a suitable pollinizer. In addition, the bloom periods of the pollinizer and main cultivar