GROWTH INHIBITION AND ENHANCED FLOWERING OF CAMELLIA HIEMALIS `SHISHI-GASHIRA' WITH UNICONAZOLE

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  • 1 Department of Horticulture, Auburn University, AL 36849
  • 2 Department of Research Data Analysis, Auburn University, AL 36849

Container grown `Shishi-Gashira' camellias received a single foliar spray of 0, 5, 10, 15, 20, 40, or 60 mg a.i. liter uniconazole on 26 May 1989. Growth indices were determined about every 4 weeks during the 1989 growing season and following the spring 1990 growth flush. Flowering was also monitored. Growth was suppressed linearly or quadratically over the duration of the test, with growth inhibition 12 months after treatment ranging-l from 3.7% (5 mg a.i. liter-1) to 20.6% (60 mg a.i. liter-1) relative to the control Flower number increased from 52.6% (5 mg a.i. liter-1) to 100% (60 mg a.i. liter-1) compared to the control. Time to flower was not affected by 5 to 20 mg a.i. liter-1 uniconazol but increased 4 to 7 days with the 40 and 60 mg a.i. liter-1 rates. Uniconazole rate did not affect flower diameter.

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