Yields of bare-rooted ‘Festival’ strawberry plants in southeastern Queensland, Australia, were best with a planting in mid-March, with lower yields with earlier or later plantings (Menzel and Smith, 2011). In contrast, large plants with crown diameters ranging from 10 to 17 mm had higher yields than small plants with crown diameters ranging from 6 to 10 mm. This research did not determine whether small plants yield proportionally less than large plants as planting is delayed after the optimum date.
The work in southeastern Queensland followed previous studies that assessed the productivity of strawberry fields in Florida. Florida has a similar climate to southeastern Queensland, with strawberry fruit produced from December to April which is equivalent to June to October in southeastern Queensland, under similar growing systems (Peres et al., 2009; Whitaker et al., 2012). Nursery material planted in October in Florida generally provided better yields or returns than material planted in September or November (Albregts and Chandler, 1994; Albregts and Howard, 1974, 1977, 1980; Chandler et al., 1991; Duval et al., 2005; Locascio, 1972).
The size of transplants has been shown to have mixed effects on yield, with experiments conducted in Europe (Bartczak et al., 2010; Schrevens et al., 1989), the United States (Takeda et al., 2004), and South America (Cocco et al., 2011). None of these experiments examined plants of different sizes planted at different times.
The effect of time of planting and plant size on the performance of ‘Festival’ and ‘Florida Fortuna’ strawberry plants growing in southeastern Queensland was studied over 2 years. The ‘Festival’ transplants were planted in late March, mid-April, or late April, whereas the ‘Florida Fortuna’ transplants were planted in early April, mid-April, or early May. The stock from the nursery was classified as small plants with crowns smaller than 8 mm (‘Florida Fortuna’) or smaller than 10 mm (‘Festival’). The large plants had crowns larger than 8 or 10 mm. The early planting for each cultivar corresponded with the time that the transplants are first available from the strawberry nurseries. ‘Florida Fortuna’ known as ‘Florida Radiance’ in the United States was developed by Chandler et al. (2009) and has been reported to produce high early season yields and maintain good fruit size. ‘Florida Fortuna’ has only been grown fairly recently in Australia. In some experiments in Florida, ‘Florida Fortuna’ has had higher yields than ‘Festival’ (Chandler et al., 2009; Santos et al., 2009; Whitaker et al., 2012) and has larger fruit at the end of the season during warm weather (Whitaker et al., 2012). These last authors also noted that it has suboptimal growth in the nurseries, including weak petioles that are easily broken. In Florida, ‘Festival’ is still the main strawberry cultivar produced and accounts for ≈60% of commercial plantings (Whitaker et al., 2011). ‘Florida Fortuna’ accounts for ≈10% of commercial plantings.
The present experiments were different to the previous research in southeastern Queensland (Menzel and Smith, 2011) in that the treatments involved small and large transplants planted at different times and included ‘Florida Fortuna’. It was proposed that the small transplants would yield proportionally less than large transplants as planting was delayed. None of the reports from Florida have investigated these relationships. There have also been no reports on optimum times of planting for ‘Florida Fortuna’ in the United States. In Australia, transplants of ‘Florida Fortuna’ are smaller than those of ‘Festival’ and are not available from the nurseries until April. Transplants of ‘Festival’ are not available until late March, after the optimum time of planting (Menzel and Smith, 2011).
Albregts, E.E. & Chandler, C.K. 1994 Effect of transplant chilling and planting date on fruiting response of 4 strawberry clones Proc. Florida State Hort. Soc. 107 323 325
Albregts, E.E. & Howard, C.M. 1974 Effect of planting date, plant chilling, and plant sources on ‘Tioga’ strawberry growth and fruiting response Proc. Florida State Hort. Soc. 87 187 192
Albregts, E.E. & Howard, C.M. 1977 Effect of planting date and pre-plant chilling on strawberry fruit production Proc. Florida State Hort. Soc. 90 278 280
Albregts, E.E. & Howard, C.M. 1980 Effect of pre-plant transplant chilling and planting date on the growth and fruiting response of ‘Dover’ strawberry Proc. Florida State Hort. Soc. 93 239 241
Bartczak, M., Lisiecka, J. & Knaflewski, M. 2010 Correlation between selected parameters of planting material and strawberry yield Folia Hort. 22 9 12
Chandler, C.K., Albregts, E.E. & Howard, C.M. 1991 Planting date affects early season strawberry production in west central Florida Proc. Florida State Hort. Soc. 104 227 228
Cocco, C., Andriolo, J.L., Cardosa, F.L., Erpen, L. & Schmitt, O.J. 2011 Crown size and transplant type on the strawberry yield Scientia Agr. 68 489 493
Duval, J.R., Chandler, C.K. & Golden, E. 2005 Planting date affects early season fruit yield of strawberry in a subtropical environment J. Amer. Pomol. Soc. 59 7 12
Hassell, R.L., Phillips, T.L., Dufault, R.J., Hale, T.A. & Ballington, J.R. 2006 Fall transplanting affects strawberry cultivar performance in South Carolina Intl. J. Fruit Sci. 6 73 85
MacKenzie, S.J., Xiao, C.I., Mertely, J.C., Chandler, C.K., Martin, F.G. & Legard, D.E. 2003 Uniformity of strawberry yield and incidence of botrytis fruit rot in an annual production system Plant Dis. 87 991 998
Menzel, C.M. & Smith, L. 2011 Effect of time of planting, plant size, and nursery-growing environment on the performance of ‘Festival’ strawberry in a subtropical environment HortTechnology 21 56 66
Menzel, C.M. & Toldi, A. 2010 An evaluation of containerized plants for strawberries growing in a subtropical environment HortTechnology 20 786 793
Peres, N.A., Price, J.F., Stall, W.M., Chandler, C.K., Olson, S.M., Taylor, T.G., Simonne, E.H. & Santos, B.M. 2009 Strawberry production in Florida, p. 259–268. In: S.M. Olson and E.H. Simonne (eds.). Vegetable production handbook for Florida 2009–2010. Vance Publishing, Lenexa, KS
Shaw, D.V. 1993 Genetic correlations between 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 transplant production and field performance in annual plasticulture HortScience 39 1592 1595
Whitaker, V.M., Chandler, C.K., Santos, B.M., Nunes, M.C.N., Plotto, A. & Sims, C.A. 2012 Winterstar™ (‘FL 05-107’) strawberry HortScience 47 296 298
Whitaker, V.M., Hasing, T., Chandler, C.K., Plotto, A. & Baldwin, E. 2011 Historical trends in strawberry fruit quality revealed by a trial of University of Florida cultivars and advanced selections HortScience 46 553 557