O. Batuman, A. Levy, M. E. Hilf, P. J. Sieburth, W. O. Dawson, and R. H. Brlansky, “2019–2020 Florida Citrus Production Guide: Tristeza Decline: PP-181/CG039, rev. 3/2019”, EDIS, vol. 2019, p. 2, Aug. 2019.