[Apple-Crop] Cueva/Double Nickel

[Kerik D. Cox]

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 about.

Actually, I've applied many of the organic coppers with an airblast and 
solo 451 mist blower and there was really no difference in performance 
in control or lack of phyto.

Best,
Kerik
> 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, reducing volume and maintaining coverage requires adequate spraying technology. i/e Not a gun.
>
> What does your spray deposit look like in your trials?
>
> Copper ions in large droplets (or high volume) react with leaf tissue until the water evaporates.
>
> Small droplets evaporate quicker and reduce the toxicity.
>
> This is something you can’t see if you paint the trees with a film of water using a gun.
>
> When you attempt to reduce volume using the same gun, all you do is apply “less” droplets… But they are still slow drying big droplets.
>
>
> So you are likely to conclude more concentrated material is more toxic… This is not surprising, right?
>
> But not so relevant to orchard spraying with small droplets.
>
> Conclusions drawn from trials performed with guns using large droplets are not always directly  applicable with airblast sprayers.
>
> it’s Happy hour time = Drinking 2 beers or one glass of wine is the same for the alcool test, right?
>
> But beer “rental” is shorter than for wine because that excess volume can’t stay in your bladder so long. So for a given metabolic rate I’m betting alcohol in your blood is higher with beer. i/e beer would get you hammered quicker than wine. I could be wrong, but at least it’s cheaper.
>
> Point is: concentration vs volume is not so straightforward and spray application technology can greatly impact results.
>
> caveat emptor.
>
>
> Vincent
>
>
>   
>
>
>
>
>
>
>
> _______________________________________________
> apple-crop mailing list
> apple-crop at virtualorchard.com
> http://virtualorchard.com/mailman/listinfo/apple-crop


-- 
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: kdc33 at cornell.edu
Faculty Office: (315) 787-2401
Fruit Pathology Lab: (315) 787-2402	
FAX: (315) 787-2389