Generic Copper Spray

Kocide3000 is great copper but I’m Always looking for a better deal. Bought this generic copper at a price I feel is fair https://www.amazon.com/gp/aw/d/B008ITVY5U/ref=ox_sc_act_image_1?ie=UTF8&psc=1&smid=A1X6GX01I44OYO. Hope someone else out there is nearly out of copper like I was and this helps them out.
This is kocide 3000 ( note package is 4 lbs) https://www.amazon.com/gp/aw/d/B01FT8J5OE/ref=mp_s_a_1_2?ie=UTF8&qid=1479380331&sr=8-2&pi=SY200_QL40&keywords=kocide+3000&dpPl=1&dpID=41peqEDeQlL&ref=plSrch

Here is a much better price for Kocide 3000

https://www.martinsproducesupplies.com/chemicals/[term-name]/kocide-3000-fungicide

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I have a four pound bag of kocide 3000 that I will use this fall and spring. Since I am leaving the country I will send it to you for free except for shipping. How about that?

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@J.D
@cl

Yes but the CuPro5000 is 61% strength and Kocide 3000 is 46%. So Kocide 3000 is only 2/3 the strength of CuPro 5000.

That also has to be figured in the calculations.:slight_smile:

Mike

Mrs.G,
If no one takes your offer,I will. Brady

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It looks to me like the CuPro 5000 is only labled for ornamentals.

That’s very generous Mrsg47! :0)

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J.D,
That’s strange the amazon description said fruit was included. That’s a very good link you posted. Usually the descriptions are fairly accurate. This is what they said “CuPRO 5000 provides superior disease control in citrus and vegetable crops through its high level of active copper, providing a healthier crop at harvest. It is most commonly used on fruits and vegetables for mildews, leaf spots, and bacterial diseases. *Note on some varieties of roses a discoloration may occur on foliage or blooms.Common Rose Diseases Controlled, Suppressed or Prevented by CuPRO 5000 are Powdery Mildew & Black Spot.”

Don’t go by % copper go by dosage. Kocide 3000 requires much less copper due to something in the copper particle form (nanoparticle technology I don’t understand). I learned that when I switched from Kocide 2000 to 3000, I halved my dose.

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I just read a paper on copper nanoparticle fate in the environment where the scientists used Kocide as a model nano-copper compound that was actually being used commercially. If you want to see what it looks like on the very small scale you can go to: http://pubs.acs.org/doi/suppl/10.1021/es504918q

The supporting info is free for all. But it is unlikely that you could actually read the whole article. (I’ve done some research on Cu-nanoparticle and plant interactions in the past, so I sort of stay up on this work.)

I suspect that the nanoparticles increase the free Cu2+ available because dissolution is limited by surface area. Typically it is free Cu2+ that is toxic to bacteria and fungi. There is probably also some other stuff in there too that makes it more effective, like the micronized balls of the nanoparticles that improve the way the spray stays suspended and goes on the tree, similar to micronized sulfur, that you don’t get if you mix up Bordeaux mixture

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XXOO Scott hoorayyyy you are something else!

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Here’s a link that should show the article @Levers101 referred to: http://escholarship.org/uc/item/65f1r02c

Scott,
Thanks for bringing that up because like Mike I thought more is better.

I think that’s right Levers.

When talking about copper sprays in general, it’s also my understanding the different chemical structures of the copper formulations release more copper, or not (i.e. copper sulfate, copper hydroxide, etc.)

Thanks for posting the article above (I’ll admit I just read the abstract though.)

Here’s a more layman’s article about the mode of action of copper.

http://cvp.cce.cornell.edu/submission.php?id=140

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I wanted to revive this old post because I suspect a lot of people are spraying copper right now.

Why would the cupro only be for ornamentals? It is the same stuff as kocide only a different particle size and percentage right?

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I would suspect that the CuPro is only for ornamentals for legal and business reasons. Likely the manufacturer did not want to go through the regulatory process to have the label extended to food crops. Also, it would be competing against DuPont Kocide 3000 in that market, whereas Kocide is not labeled for ornamentals, so that is the niche they are exploiting. From SePRO’s website it looks like their business focus is on the nursery/greenhouse trade, so that would also make sense.

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Wanted to bump this topic again. Many people are buying copper with generic labels like I did formerly so I thought we could all benefit by knowing about kocide3000. Less is better when it comes to copper and long term usage.

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I’m using Bonide copper soap right now but running low on it. Probably have enough for one more spray then I have buy more copper. Came here to do research and found this thread.
Clark do you still use CuPro? Haven’t noticed any ill effects even if it’s only rated for ornamentals?

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Kocide is really good copper in most situations. Think I wound up using this for smaller non producing pears and other similar things. Kocide is reasonable now in comparison to the wide price difference then https://www.amazon.com/Kocide-3000/dp/B07DY7LWHF/ref=sr_1_1?s=lawn-garden&ie=UTF8&qid=1542598853&sr=1-1&keywords=kocide+3000

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