Dr. William S. Castle
Citrus scion and rootstock development and evaluation, and rootstock selection based on economic models; orchard design and management of high density plantings; citrus propagation and preplant expert systems; windbreak design and establishment; and, pomegranate cultivars and plantings.
Castle, B. with inputs by F. Gmitter and J. Grosser. 2017. Rootstock options for grapefruit varieties suggested by field research conducted in the Indian River Region. A white paper prepared for members of the Indian River Citrus League and other interested growers. PDF
Castle, Bill. 2016. HLB and 'tolerance' as a practical matter in choosing rootstocks. Citrus Industry Online 8(36):1-3. PDF
Castle, B, and E. McTeer, 2016. Pomegranates in Florida — really?. Citrus Industry 97(8):32-34.
Grosser, J., F. Gmitter, and B. Castle, 2015. New sweet orange cultivars. Citrus Industry 96(3):10-18. PDF
Castle, B., J. Grosser., K. Bowman and E. Stover, 2015. An HLB-tolerant citrus rootstock: What exactly does that mean?. Citrus Industry 96(6):16-19. PDF
Grosser, J., F. Gmitter, and B. Castle, 2013. New fresh citrus varieties from the University of Florida. Citrus Industry 94(8):10-18. PDF
Castle, B. 2011. Pomegranates in Florida? Citrus Industry 92(7):14-16.
Castle, B. 2011. Alfred H. Krezdorn papers donated to the CREC. Citrus Industry 92(6):14-17. PDF
Castle, W.S. 2011. Pomegranates for now. Hosted at UF/IFAS/CREC website:www.crec.ifas.ufl.edu. Available at this link:http://www.crec.ifas.ufl.edu/extension/pomegranates/.
Castle, W.S., K.D. Bowman, J.C. Baldwin, J.W. Grosser, and F.G. Gmitter, Jr. 2011. Rootstocks affect tree growth, yield, and juice Quality of 'Marsh' grapefruit. HortScience 46(6): 841-848. PDF
Castle, W.S., J.C. Baldwin, and R.P. Muraro. 2010. Rootstocks and the performance and economic returns of 'Hamlin' sweet orange trees. HortScience 45(6): 875-881. PDF
Castle, W.S., J.C. Baldwin, and R.P. Muraro. 2010. Performance of 'Valencia' sweet orange trees on 12 Rootstocks at two locations and an economic interpretation as a basis for rootstock selection. HortScience 45(4): 523-533. PDF
Castle, W.S. 2010. A career perspective on citrus rootstocks, their development, and commercialization. HortScience 45(1): 11-15. PDF
Shen, X., W.S. Castle, and F.G. Gmitter. 2009. Petroleum ether separation and seedcoast removal enhance seed germination of a Casuarina equisetifolia L. x C.glauca Sieb. ex Spreng hybrid. HortScience 44(3): 770-773. PDF
Castle,W.S., J. Nunnallee, and J.A. Manthey. 2009. Screening citrus rootstocks and related selections in soil and solution cutlure for tolerance to low-iron stress. HortScience 44(3):638-645. PDF
Shen, X., W.S. Castle, and F.G. Gmitter. 2009. Micropropagation of a Casuarina hybrid (Casuarina equisetifolia L. x casuarina glauca Sieber ex Spreng) following facilitated seed germination. Plant Cell, Tissue and Organ Culture.
Morgan, K.T., T.A. Wheaton, L.R. Parsons, and W.S. Castle. 2008. Effects of reclaimed municipal waste water on horticultural characteristics, fruit quality, and soil and leaf mineral concentration of citrus. Hortscience 43(2):459–464. PDF
Castle, W.S., J.C. Baldwin, and R.P. Muraro. 2007. ‘Hamlin’ orange trees on Flying Dragon trifoliate orange, Changsha mandarin, or Koethen sweet orange x Rubidoux trifoliate orange citrange rootstock at three in-row spacings in a flatwoods site. Proc. Fla. State Hort. Soc. 120:92–96. PDF
McCoy, C.W., R.J. Stuart, M.E. Rogers, H.N. Nigg, and W.S. Castle, 2005. Management of adult Diaprepes root weevil on citrus with foliar sprays. Arthropod Management Tests. PDF
Castle, W.S., and T.R. Gottwald, 2005. Spatio-temporal analysis of tree decline losses among navel orange trees on Swingle citrumelo rootstock in two central Florida citrus groves. Proc. Int. Org. Cit. Vir. (In press).
Albrigo, L.G., J. Attaway, K. Bowman, R.S. Buker, W.S. Castle, S. Futch, K.W. Hancock, C.W. McCoy, R.P. Muraro, M.E. Rogers, M.A. Ritenour, T. Spreen, P.D. Spyke, J.P. Syvertsen, L.W. Timmer, and R.C. Vachon, 2005. The impact of four hurricanes in 2004 on the Florida Citrus Industry: Lessons learned, what we know and what we don”t know. Proc. Fla. State Hort. Soc. 118:66-74
Bauer, M, W.S. Castle, B.J. Bowman, and T.A. Obreza, 2005. EconomicLongevity of citrus trees on Swingle citrumelo rootstock and their suitability for soils in the Indian River region.. Proc. Fla. State Hort. Soc. 118:15-18
Castle, W.S. and J.C. Baldwin, 2005. Rootstock effects on “Hamlin” and “Valencia” orange trees growing at Central Ridge and flatwoods locations. Proc. Fla. State Hort. Soc. 118:4-14.
Castle, W.S. and M.G. Bauer, 2005. The 10-year performance and survival of “Marsh” grapefruit trees on Sun Chu Sha mandarin and various citrumelo rootstocks on Riviera sand, depressional, an Alfisol. Proc. Fla. State Hort. Soc. 118:80-84.
Castle B., 2005. A look on the bright side: rootstocks, soils, and the future. Citrus Industry. 86(5):29-33.
Barry, G.H., W.S. Castle, and F.S. Davies, 2004. Juice quality of “Valencia” sweet oranges borne on different inflorescence types. HortScience 39(1):33-35 https://doi.org/10.21273/HORTSCI.39.1.33
Barry, G.H., W.S. Castle, and F.S. Davies, 2004. Rootstocks and plant water relations affect sugar accumulation of citrus fruit via osmotic adjustment. J. Amer. Soc. Hort. Sci. 129(6):881-889. https://doi.org/10.21273/JASHS.129.6.0881
Barry, G.H., W.S. Castle, and F.S. Davies, 2004. Soluble solids accumulation in “ Valencia sweet orange as related to rootstock selection and fruit size. J. Amer. Soc. Hort. Sci. 129(4):594-598. https://doi.org/10.21273/JASHS.129.4.0594
Castle, B., M. Bauer, B. Bowman, T. Obreza, and E. Stover, 2004. Matching soils with rootstocks, especially Swingle citrumelo. Citrus Industry 85(7):15-18.
Castle, B., T. Hammond, M. Kesinger, 2004. W. Murcott, a new scion variety on the scene. Citrus Industry 85(5):13-14.
Castle, B. and W.C. Oswalt, 2004. Tree condition observations of sweet orange trees on Swingle citrumelo rootstock growing in ridge sites. Citrus Industry 85(9)18-21.
Li, H., J.P. Syvertsen, R.J. Stuart, C.W. McCoy, A.W. Schumann, and W.S. Castle, 2004. Soil and Diaprepes abbreviatus root weevil spatial variability in a poorly drained citrus grove. Soil Science 169:650-662. https://doi.org/10.1097/01.ss.0000142637.54611.7d
Bauer, M.G., W.S. Castle, B.J. Bowman, T.A. Obreza, and E.W. Stover, 2004. Root systems of healthy and declining citrus trees on Swingle citrumelo rootstock growing in the southern Florida flatwoods. Proc. Fla. State Hort. Soc. 117:103-109.
Castle, W.S., J.W. Grosser, F.G. Gmitter, R.J. Schnell, T. Ayala-Silva, J.H. Crane, and K.D. Bowman, 2004. Evaluation of new citrus rootstocks for “Tahiti” lime production in southern Florida. Proc. Fla. State Hort. Soc. 117:174-181.
McCoy, C.W., W.S. Castle, J.H. Graham, J.P. Syvertsen, A.W. Schumann, and R.J. Stuart, 2004. Pesticide suppression of Diaprepes abbreviatus (L.) (Coleoptera: Curculiondae) promotes differential growth and survival of “Hamlin” orange trees budded to five rootstocks in a Phytophthora infested grove. Proc. Fla. State Hort. Soc. 117:167- 173.
Li, H., J.P. Syvertsen, R.J. Stuart, C.W. McCoy, A.W. Schumann, and W.S. Castle, 2004. Soil calcium, magnesium, and iron associated with root weevil distribution and citrus tree decline: A case study in Florida. Proc. Int. Soc. Citricult. (In press).