crop cultivation
drench applied in week three to multiple applications. Treatments 2, 3, 4 and 5 are Topfl or at 0.5, 1, 2 and 4 ppm, respectively, and illustrate a nice increase in control with increasing amounts of chemical.
Treatments 6, 7 and 8 show the effect of lower concentrations and multiple Topfl or applications. In this example, we did not use a spray to control early growth of the plants, and the single drench
applications were applied slightly earlier (week three) than usual. In this case, the fi rst application of the multiple drench treatments and the single-application treatments occurred simultaneously.
Overall Implications
Applying multiple drenches
at lower rates has been suc- cessful in providing control for both vigorous petunia varieties and lower-vigor impatiens. For growers, multiple applications provide greater fl exibility, and crops
can either be treated or
left alone, depending on how the plants are growing. As with any PGR application, growers should conduct their own trials to deter- mine individual results. To fi nd the application rate to test for ini- tial trials of the multiple drench technique, you can take the total amount of chemical used in a single drench and divide it by the number of drenches you plan to make. If early sprays are not used for initial growth control, it is important to start the multiple drenches early enough to obtain strong, compact baskets. GPN
Jim Barrett is professor of fl oriculture and Carolyn Bartuska is senior biologist at the University of Florida in Gainesville. Barrett can be reached at jbarrett@ufl .edu.
LearnMore
For more information
related to this article, go to
www.gpnmag.com/lm.cfm/gp051003
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