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Botrytis cinerea  Pers. causes gray mold on greenhouse-grown geraniums ( Pelargonium ×hortorum  L. H. Bailey), among many other crops. Bicarbonates effectively control rose powdery mildew (Plant Dis. 76:247–480) and inhibit  B. cinerea  in vitro colony growth and conidial germination (Phytopathology 84:546, 1065). To examine bicarbonate effects on gray mold incidence and geranium growth, we sprayed seedling geranium cultivars Red Elite and Scarlet Elite weekly with 0, 25, and 50 mM NH 4 HCO 3  or KHCO 3 . Seedlings were transplanted in Metromix 360 and misted every 24 m for 5 s to enhance disease development. Data were collected biweekly on disease incidence, floral number, plant height, and dry weight. Both cultivars performed similarly. Disease incidence decreased with application of bicarbonates. KHCO 3  at 25 mM slightly increased dry weight and height over 0 mM, whereas 25 and 50 mM NH 4 HCO 3  greatly increased both features. Fifty mM KHCO 3  decreased height slightly, but had no effect on dry weight. Floral number decreased slightly with all bicarbonate treatments. It is indicated that KHCO 3  at low levels and NH 4 HCO 3  enhance seedling geranium growth by controlling gray mold incidence and by providing additional nutrients. (Supported by H&amp;I Agritech Inc., Ithaca, NY 14850.)

Bicarbonates and Botrytis: VI. Control of Gray Mold Enhances Geranium Growth