Hi Vincent,
I'm sorry that our trials resulted in the opposite expectation. Most of
the company protocols ask me to apply their products at 100 gal/A. I
guess they were hoping to increase the chance of showing product injury
at my field days. I thought it was a more universal tree row volume for
apples, my mistake. The field crews at Geneva and Ithaca sprays
everything at 100 gal/A. I guess it's an underhanded attempt to
potentially injure our plots with copper. With all my dilute handgun
applications, I'm surprised that I don't have potatoes. I guess I keep
getting lucky.
Best,
Kerik
Hi Kerik,
I don’t know how much experience you actually have with airblast
sprayer trials varying volume, but this is something we do routinely.
Evidence of copper injury with high volume sprays dates back (at
least) to 1972. Look it up. Classic experiments demonstrate the same
amount of copper can defoliate plants or result in no injury, just by
varying volume.
Let’s say I have a hard time “swallowing” your aspirin analogy…!
Let’s stick to apples, OK?
The fact that labels require you to apply large volumes of water
doesn’t make it a sound or sensible advice.
Most likely, the labels reflect the trial conditions. And most trials
in the USA are run with high volume….!
Vincent
Le 1 mai 2017 à 08:31, Kerik D. Cox <kd...@cornell.edu
<mailto:kd...@cornell.edu>> a écrit :
Hi Vincent,
We've found that concentration is potentially more damaging with
copper than higher volumes as the both 50gal and 100gal get the same
amount of copper. It's like taking powdered aspirin with half the
recommended amount of water. Also, many labels in the US actually
require that certain products be applied in a minimum of 100 gal/A.
If were potentially injurious to apply at 100 gal/A, I assure you
that no company would include any such statements on label. Actually,
they would, without a doubt, put statements saying that the product
should not be applied at 100 gal/A or injury would occur. Excess
water seems to just roll off the trees in our experiments.
Best,
Kerik
I hope you meant a Low volume of water. High volume = slow drying =
russeting. This is very easy to demonstrate. We do it as a "control"
in plots. We always have copper induced russeting at 500 L/ha and
none at 225 L/ha.
Vincent Philion, agr., M.Sc.
Le 1 mai 2017 à 08:05, Two Onion Farm <far...@twoonionfarm.com
<mailto:far...@twoonionfarm.com>> a écrit :
Kerik Cox at Cornell has done trials with this combination for
cedar apple rust, summer fungal diseases, and fireblight and has
had good results.
We started using the combination in our organic orchard last year
and did not see any problems with fruit russeting. Kerik did
caution me to use a high volume of water to avoid toxicity from the
copper (100 gallons per acre vs our normal 50 in our high density
orchard). We have used 2 qts/acre Cueva + 2 lbs/acre 2ble nickel.
Kerik also suggested that the 2ble nickel might be unnecessary and
that cueva alone might be sufficient, but that may be theoretical
at this point. The 2ble nickel does add a lot of cost.
Chris
Chris & Juli McGuire
Two Onion Farm
www.twoonionfarm.com <http://www.twoonionfarm.com/>
19638 Cottage Inn Road
Belmont, WI 53510
(608) 762-5335
far...@twoonionfarm.com <mailto:far...@twoonionfarm.com>
On 5/1/2017 6:43 AM, maurice tougas wrote:
A couple years ago I recall discussion regarding the use of
Cueva/Double Nickel combination as an alternative and/or rotation
with strep for fireblight management. Is anyone aware of further
research regarding this combination esp as to regards to crop
safety and efficacy ?
Mo Tougas
--
Maurice Tougas
Tougas Family Farm
Northborough,MA 01532
508-450-0844
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Kerik D. Cox, Ph.D., Associate Professor
Plant Pathology and Plant-Microbe Biology Section
School of Integrative Plant Science
Cornell University
221 Barton Lab
NYSAES
630 West North Street
Geneva, NY 14456 USA
E-mail:kd...@cornell.edu
Faculty Office: (315) 787-2401
Fruit Pathology Lab: (315) 787-2402
FAX: (315) 787-2389
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_______________________________________________
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--
Kerik D. Cox, Ph.D., Associate Professor
Plant Pathology and Plant-Microbe Biology Section
School of Integrative Plant Science
Cornell University
221 Barton Lab
NYSAES
630 West North Street
Geneva, NY 14456 USA
E-mail: kd...@cornell.edu
Faculty Office: (315) 787-2401
Fruit Pathology Lab: (315) 787-2402
FAX: (315) 787-2389
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