Need copper spray suggestions.

[edweather]

Have been using only Daconil so far on tomatoes and other veggies, and would like to cycle in some copper based spray. Suggestions please. Thanks, Ed

[b54red]

I use the Southern Ag brand and it seems to work pretty good at the lowest recommended amount.

Bill

[Nematode]

Bonide copper octanoate seems.effective in the northeast.

[carolyn137]

https://www.google.com/search?q=copp...&bih=790&dpr=1

Carolyn

[Cole_Robbie]

Originally Posted by Nematode

Bonide copper octanoate seems.effective in the northeast.

Same here.

[edweather]

That Southern Ag stuff looks promising, thanks.

[Rockporter]

I bought some southern ag yesterday to use on my garden after the next rain. We'll see how it goes.

[cwavec]

I find copper octanoate (i.e. copper soap) effective. for a couple of years I
tried it in various combinations and/or sequences with Daconil with
results good but not spectacular.

Finally, I tried copper octanoate with a spreader-sticker (Bonide Turbo).
Huge difference. The spreader sticker enhances the effect of the copper
soap substantially.

I used it in 2012 as a last ditch effort to recover from late blight
(phytopthora infestans). It is said that you cannot cure this infection.
However, using this combination on a row of tomatoes with an already
serious infection of late blight, I did cure it. Blight gone for the rest of
the season. Tomatoes survived and produced. I don't want to claim
too much here; there may have been other factors.

BUT - you must be careful. The dosage recommendation for copper
octanoate fungicide from the original German manufacturer,
W. Neudorff GmbH was 1 ounce per gallon of water. The recommendation
now is from 1/2 to 1 ounce per gallon. As long as you use no spreader-
sticker 1 oz. may be OK. It seemed to be for me. When I tried that with
spreader-sticker on young plants, there was a phytotoxic effect. New
foliage on young plants had a "monkey fist" appearance. 1/2 oz. per
gallon proved OK and I now limit myself to that concentration or less. I
measure it very carefully using a calibrated spoon.

Bonide is not the only source although it may be the easiest to find.
Always look for a 10% active ingredient. If you want a less expensive
supply wait until Gardens Alive sends out their spring offers with a
$25 coupon. I got a bunch that way.

[cwavec]

The Southern Ag product is not the same.

It is copper diammonia diacetate complex.

I have not used it and have no comment on
its qualities.

I believe the reason for both of these products is to decrease
the total copper content (it can contaminate your soil) while
maintaining or increasing the availability of free copper ions
in surface moisture or in plant tissue. It is this free ionic
copper which kills the fungi

[edweather]

Thank you for your information on copper octanoate. Am looking into it. Have checked out the Bonide and Gardens Alive sites. Looks like I can get the $25 coupon for just signing up. Our ACE Hardware has an amazing supply of stuff, and will be checking there too. So far so good here in hot humid Georgia. The humidity and rain have really kicked in. Like clockwork at the end of May we went from severe drought and low humidity, to the switch being flicked, and now high humidity and heavy rain almost every day. Will be very interesting to see how the tomatoes, cukes, and beans hold up. Everything is full grown and producing at max output.

[Gerardo]

Southern Ag "Liquid Copper Fungicide" works well for me, 10-12 mL per gallon. Way more effective than Daconil here.

[edweather]

By the time it's over I'll probably have it all :-) I like the sound of Southern Ag, because I'm down south. Right now Daconil is working. I have some Spectracide also that I used on strawberries and a couple of apple seedlings that were getting rust spots.