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Spitzer T., Misa P., Bilovský J., Kazda J. (2015): Management of maize stand height using growth regulators. Plant Protect Sci., 51: 223–230. Effect in reducing maize plant height using growth regulators ethephon, chlormequat chloride (CCC), CCC + ethephon, and mepiquat chloride + prohexadione-Ca was studied in field experiments during 2010 and 2011. It was found that maize plant height could be reduced by as much as 125 cm (49% of control) using a double application of ethephon (576 g a.i./ha) at growth stages BBCH 18–19 and BBCH 34–36. The other growth regulators displayed weak or no influence. An optimum level of shortening was achieved using ethephon (576 g a.i./ha) at BBCH 34–36 (reducing plant height by 40–90 cm), but it is necessary to count upon yield loss of 0.5–0.6 t/ha.