Following twenty years of research,
Garden Shield is marketing this non-toxic, 98%+ effective, and environmentally safe iris
borer spray. The spray comes in a one-quart size plastic spray bottle and sells for around
$25 with some discounts available. You probably will not find it in garden stores
because it is a new, specialized product. You can, however, read all the details about
Iris Borer Deterrent at the Garden Shield online website. The
address is www.gardenshield.com. You can also call the company toll free at 1-866-690-4000.
You can order either online or over the telephone.
Garden Shield reports that Iris Borer Deterrent is extremely effective against iris borers
in all stages. They recommend that it be used throughout the growing season
from the first warm days of spring; whenever you are transplanting; and whenever new growth
appears. The directions indicate that you should spray only on cloudy days or during dusk
or dawn to prevent possible leaf spotting. You may spray leaves, rhizomes, and even the
soil in which the irises are growing.
This product is nontoxic because it repeals iris borers (and many other critters both mammal and insect)
instead of killing them. The active ingredient, Methyl Nonyl Ketone, was used as an
ulcer drug in 1950s. It is presently used as a fragrance enhancer in cosmetics and perfumes.
Garden Shield conducted five years of intensive field testing with the Iris Borer Deterrent before it became
registered with the Environmental Protection Agency. The following is a brief summary of the results of field-testing.
In year one of the trials no borers were found in the Iris Borer Deterrent treated plot. In a plot of equal size that
was left unprotected, 49 borers were found. In year two the figures were 1 borer in the treated plot and 56 borers in
the non-treated iris plot. In year three 2 borers were found in the treated plot, while 52 borers were observed in the
unprotected plot. In the fourth year 3 borers were noted in the sprayed plot with 57 in the unprotected plot. In year
five no borers were found in the treated plot, while 75 were observed in the untreated plot. These results are, indeed,
One question remains to be answered relative to your use of the Iris Borer Deterrent, and that is, "Is this right product
for me to use?" First, the product appears to meet all the EPA's safety and effectiveness requirements, and presently is
in a patent pending process. If you have a very large iris garden Iris Borer Deterrent could prove to be rather expensive
and labor intensive compared to other forms of iris borer protection and treatment. On the other hand, if you have a small
iris collection and controlling borers without resorting to toxic pesticides is important to you, then Iris Borer Deterrent
might be a good choice for you.