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Douglas V. Shaw, Frank G. Zalom and Kirk D. Larson

Eighteen strawberry genotypes from the University of California's breeding population were evaluated over two years for yield and fruit size with complete, partial, and no control of natural infestation by Tetranychus urticae Koch. The numbers of mites per leaf accumulated for the entire season or counted at peak infestation, and the number of mite-days accumulated for the season for partial control treatments were 31.7% to 44.0% of corresponding values realized for uncontrolled infestation, and values differed significantly between treatments for all three variables. Yields for the no-control and partial-control treatments averaged 81.6% and 85.0% of the yields obtained with complete spidermite suppression for the 2 trial years; fruit sizes were 95.1% and 92.0% for corresponding comparisons. Yield and fruit size differed significantly between the complete-control treatment and any level of infestation, but statistically significant differences between partial and complete mite control treatments were detected only for fruit size in a single year. Analysis of variance demonstrated significant or highly significant variation due to control level, genotype, and their interactions for both yield and fruit size, but resolution of variance components demonstrated that genetic × treatment interactions explained just 0% to 8% of the phenotypic variance for yield and fruit size in a 2-year evaluation. Genotypic variances, those reflecting genetic effects that were stable across treatments, were at least 9.3 times as large as interaction variances for these traits. There appears to be no evidence for partial resistance that might be expressed at intermediate levels of spidermite infestation.

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Johshin Tsuruyama and Toshio Shibuya

temperature conditioning of ‘Sweet Charlie’ strawberry ( Fragaria × ananassa Duch.) plugs enhances off-season production Scientia Hort. 201 184 189 Durner, E.F. Poling, E.B. Maas, J.L. 2002 Recent advances in strawberry plug transplant technology

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Marvin P. Pritts

to come. Units Literature cited Acuña-Maldonado, L. 2005 Carbon and nitrogen reserve status and partitioning affect growth and yield in the perennial strawberry ( Fragaria × ananassa Duch.). Cornell Univ., Ithaca, NY, MS Thesis Acuña-Maldonado, L

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Nauja Lisa Jensen, Christian R. Jensen, Fulai Liu and Karen K. Petersen

potential reaches −1.0 MPa ( Sruamsiri and Lenz, 1986 ). To date, no published work has been reported on chemical signaling in xylem sap of Fragaria × ananassa during soil drying, DI, or PRD. PRD irrigation is based on the hypothesis that PRD plants

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Lisa W. DeVetter, Huan Zhang, Shuresh Ghimire, Sean Watkinson and Carol A. Miles

Total U.S. strawberry ( Fragaria × ananassa ) production was estimated to be 1.59 million t from 21,245 ha in 2016 [ National Agricultural Statistics Service (NASS), 2017 ]. About 79% of the U.S. strawberry industry is concentrated in California

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Jayesh B. Samtani, Celeste Gilbert, J. Ben Weber, Krishna V. Subbarao, Rachael E. Goodhue and Steven A. Fennimore

California accounts for 85% of strawberry ( Fragaria × ananassa , Duch.) production in the United States and ≈20% of worldwide production [ U.S. Environmental Protection Agency (USEPA), 2009a ]. Most of the 16,107 ha under strawberry cultivation in

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Christopher M. Menzel, Lindsay A. Smith and Jenny A. Moisander

. Darby, J. Battey, N.H. 1998 The effect of thermal environment, planting date and crown size on growth, development and yield of Fragaria × ananassa Duch J. Hort. Sci. Biotechnol. 73 786 795 Menzel, C.M. Smith, L. 2011 Effect of time of planting

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Christopher M. Menzel and Lindsay Smith

vegetative growth traits and productivity at different with-in season intervals for strawberries ( Fragaria × ananassa ) Theor. Appl. Genet. 85 1001 1009 Takeda, F. Hokanson, S.C. Enns, J.M. 2004 Influence of daughter plant weight and position on strawberry

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Michelle L. Paynter, Joanne De Faveri and Mark E. Herrington

strawberry ( Fragaria ×ananassa Duch.) estimated by exploring mixed and spatial models and pedigree information Theor. Appl. Genet. 111 256 264 de Souza, V.A.B. Byrne, D.H. Taylor, J.F. 1998 Heritability, genetic and phenotypic correlations and predicted

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Christopher M. Menzel and Lindsay Smith

.L. Bish, E.B. Chandler, C.K. 1998 Propagation site latitude influences initial carbohydrate concentration and partitioning, growth, and fruiting of ‘Sweet Charlie’ strawberry ( Fragaria × ananassa Duch.) transplants grown in Florida Proc. Florida State