December 2019 - 28

PLANT HEALTH
Rescue Plants
Using a PGR to
from a
PGR
How can a proven PGR kick start plants and save crops from overapplication?
BY DUDLEY DABBS
G
rowers have long known and leveraged plant growth regulators
to control height. The combination of benzyladenine (BA) and
gibberellic acid (GA) is a very effective tool for accomplishing this.
While the benefits of these PGRs for enhancing growth are well known,
Fine Americas discovered - while researching and refining the use of
Fresco as a drench application - that this product can also be used to
overcome overapplication of growth-inhibiting PGRs like paclobutrazol
or uniconazole. An additional benefit Fine discovered is that if plants are
stalled, the Fresco drench application can effectively restart the plants'
growth - often saving the crop and a production cycle.
Situations can necessitate a kick start in plant growth. If a grower has
just applied a growth-inhibiting PGR, and then their customer moved up
the order, Fresco drenches can help. It could also be that a grower has a
deadline for a liner order, but the plants just aren't taking off the way they
should. Fresco can get plants growing with good structure. Previously, GA
and BA products could only be applied as a foliar spray, which would not
have as much impact on growth. Today, you can hit the stalled plants with
a Fresco rescue drench, and restart their growth.
Although the spray version of Fresco has been around for years,
spraying the PGR will not overcome overapplications of growth-inhibiting
PGRs. However, a drench to the roots does a good job of giving an even
response throughout the plant. This makes the product more effective in a
way that it wasn't as a spray. Fresco is the only GA4+7 and 6-BA product
registered for drench applications.
28 DECEMBER 2019 GPNMAG.COM
Through our research, Fine discovered that certain plant species and
cultivars are ultrasensitive to paclobutrazol. Those are the crops that are
most susceptible to overapplication. They include New Guinea impatiens,
ageratum, begonia, impatiens and viola, to name a few.
THE SCIENCE BEHIND SAVING CROPS
Fresco has been proven to effectively reduce leaf yellowing in lilies, as
well as encourage poinsettia bract development. But how does Fresco
work as a rescue drench? Fresco is a combination of 1.8% gibberellins

http://www.GPNMAG.COM

December 2019

Table of Contents for the Digital Edition of December 2019

December 2019 - 1
December 2019 - 2
December 2019 - 3
December 2019 - 4
December 2019 - 5
December 2019 - 6
December 2019 - 7
December 2019 - 8
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December 2019 - 10
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