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Poinsettia  (Euphorbia pulcherrima  Wind. ex. Klotzsch  cv . Gutbier V-14 Glory) plants were grown under conditions simulating commercial stock plant production to investigate the effects of NH 4 -N: NO 3 -N fertilizer ratios, foliar Ca sprays, medium-applied Ca, and medium-applied Mo on leaf edge burn (LEB) and cutting production. Leaf edge burn expression was nearly 100% greater with NH 4 -N: NO 3 -N fertilizer ratios of 1:2 or 2:1 than with NO 3 -N only. However, cutting production was 28% lower with NO 3 -N as the sole N source. There was little difference in either LEB or cutting production between the two NH 4 -N levels. Weekly Ca sprays at 500 mg·liter -1  were effective in reducing LEB, while medium-applied Ca as gypsum was ineffective. Foliar Ca sprays reduced both the number of LEB leaves (90%) and symptom severity of individual leaves. Spraying plants with tap water (Ca at 25 to 30 mg·liter -1 ) plus wetting agent had an intermediate effect. Medium-applied Mo was ineffective in reducing LEB, despite greatly increasing leaf Mo levels. The Ca concentration in chlorotic, marginal leaf tissue was significantly lower than the Ca concentration in green leaf margins. There was also a strong, negative correlation between the Ca concentration in young leaves at the susceptible growth stage and the incidence of LEB in various treatment groups. Supplemental applications of Ca and Mo did not consistently affect cutting production. Leaf edge burn appears to be a localized Ca deficiency due to inadequate Ca uptake and/or translocation to the numerous axillary shoots simultaneously developing on poinsettia stock plants.

Leaf Edge Burn and Axillary Shoot Growth of Vegetative Poinsettia Plants: Influence of Calcium, Nitrogen Form, and Molybdenum