US: Tips for using Fresco

When one thinks of plant growth regulators (PGRs), the primary focus is on growth control mainly through regulating internode stretch. There are times when additional growth is needed. That is where a growth enhancement PGR such as Fresco should be considered.

by Brian Whipker, North Carolina State University

Fresco is a combination of 1.8% gibberellins A4+A7 [GA4+7] and 1.8% benzyladenine [6-BA]. This combination provides stimulation of intermodal elongation with the GA4+7 and enhancement of axillary shoot growth with the BA. When mixed together, the combination provides a controlled stimulation of enhanced plant growth.

Figure 1. Growth enhancement with the use of Fresco foliar sprays on New Guinea impatiens after the plants were stalled with an overdose paclo application.

The other labeled option for enhancing plant growth is Florgib 4L. It contains gibberellin A3 and only the lowest label rates should be trialed and used to avoid excessive stretch. By far, the majority of growers prefer to use Fresco because it enhances elongation and fullness of the plant, while providing a wider window of safety for avoiding overdose applications.

In addition, Fresco can be used to enhance bract development on poinsettias and aid in avoiding lower leaf yellowing on lilies. With Fresco being an excellent tool in providing growth enhancement and improving postharvest quality, it is a handy addition to have in your PGR toolbox. In order to obtain the most effect from Fresco, here are some application tips to consider.