And use a spreader-sticker for a large increase in efectiveness of copper. I've had a lot of experience,
mostly favorable, with this material. It comes in many brands but any worth
having will show the composition on the outside of the package, usually on the back
(10% copper octanoate).
Since this became available in the late nineties, recommended strength has changed
a lot. Beginning at 2 oz. per gallon of water, most uses are now at or below 1 oz.
With a spreader-sticker on tomatoes, more than about 1/2 oz. per gallon can be
phytotoxic.
Over time, I have concluded that this product is equally effective at lower doses. Most
of the time these days, I use no more than 10-12 ml/gal WITH a spreader-sticker.
Measuring such small quantities with a spoon is messy, so I use a syringe and
needle. Don't worry; this wouldn't be a needle useful in any illicit purpose.
Amazon has them in great variety. Choose a 14 or even 12 gauge needle as both
the copper concentrate and the s-s may be pretty viscous.
And one more hint. It isn't always very effective by itself so use it in alternation
with another product for best results.
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