Hi Vincent,
I think you missed the first line of the last message where I say that
this work was done with an airblast sprayer at 100 gal/A in my organic
orchard. One must have a dedicated sprayer for organic. I can't use the
handgun that block. Don't know what the fuss about handguns is
If we “must" continue this:
> Our injury results seem to follow the acute toxicity/exposure phenomenon,
> whereby injury is higher when the concentration is higher not more dilute.
> This is not unlike when one is exposed to a toxin in water, air, or direct
> contact.
In orchard trials,
Hi Vincent,
Our organic trials were comparing Badge alt Microthiol and Cueva +
Double Nickel. They were all air blast at 100 gal/A. We've done a lot of
injury trials and injury is seems to be increased with low volume or
concentrate applications. Our injury results seem to follow the acute
Hi Kerik,
It would certainly be interesting to understand why results differ so greatly.
It’s unfortunate that companies insist on high volume spraying. Aside from the
russeting issue, there are many good reasons to reduce spray volume (in
relation to tree size). It’s also unfortunate most
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
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
I'm certainly not an expert! The cueva label says "May cause russeting
of susceptible apple varieties. Do not exceed the 1.0 gallon of product/
100 gallons water use rate." When Kerik started me on this program, he
said "we never get fruit finish injury. However, depending on your spray
On the topic of copper: you don't need to spend extra for Cueva. Use of
standard oxychloride at a low dose is just as good in most instances.
Vincent Philion, agr., M.Sc.
Le 1 mai 2017 à 08:05, Two Onion Farm
> a écrit :
Kerik Cox at
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