On behalf of Nick and Clive:
I also add an email exchange I had with Clive Marsh on this subject.
We certainly compared to Mankocide to Kocide and found it to be significantly superior. We can’t be sure of the reason but the most likely reason is that the dithiocarbamate is efficacious (both Mankocide & Kocide have CuOH but only Mankocide has dithiocarbamate). I don’t know about Kocide plus, but if it doesn’t have dithiocarbamate, I wouldn’t bother. I know Mankocide is expensive and we did compare to a ‘home-brew mankocide’.. i.e. a mix of cheaper products containing CuOH and dithiocarbamate but again the Mankocide was significantly superior- again I don’t know what the trick is in formulation but that’s why I’m a farmer and DuPont are bactericide-ists.
The benchmarking data should give us data on efficacy, but our own observations are that we get better control with mankocide than others do by other means. The cost-benefit is not so clear-cut, we spent ~ $5,000 on Mankocide (includes estimate of application costs as well as chemicals) last season and we probably saved $3000~$10,000 worth of nuts.. but I couldn’t say for sure that benefit>cost.. but I do ‘think’ that benefit>cost and we plan to continue to use it.
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