in HortScience
Author: Susan S. Han1
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  • 1 Department of Plant and Soil Sciences, French Hall, University of Massachusetts, MA 01003

The development of postproduction foliar chlorosis is one of the critical problems that remains unsolved in Easter lily production. Plants at the white puffy stage were sprayed with 500 mg gibberellic acid (GA3)/liter, 500 mg benzyladenine (BA)/liter, 500 mg each GA3 and BA/liter, 500 mg ProGibb (containing 500 mg GA3/liter)/liter, and 1000 mg Promalin (containing 500 mg GA4 + GA7/liter and 500 mg BA/liter)/liter, and a water control. Development of foliar chlorosis was evaluated in a simulated interior environment at a temperature of 22.6 ± 0.2C and illuminated 12 h·d–1 with 11.2 ± 0.1 mmol·m–2·s–1 from cool-white fluorescent lamps. Results demonstrated that GA3, BA, ProGibb, and Promalin are effective in delaying the development of foliar chlorosis of cold-stored plants. Promalin was the most effective. Concentrations of Promalin as low as 50 mg· liter–1 were effective. Treatments had no effect on the development and the longevity of flower buds. This study thus suggests that application of Promalin to Easter lily plants prior to marketing is a viable solution to preventing postproduction development of foliar chlorosis.

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