Citrus > Citrus General Discussion

Phosphoric Acid Fungicides can react with Copper Oxy Fungicides

<< < (2/2)

You mean phosphorous acid not phosphoric acid I presume.

Phosphorous acid at 50% w/w is effective against phytophthora and fusarium spores.
I studied this for few years and made some experiments. This is best applied as a drench when signs of decline start to show.
It has been recently banned in Europe as residues stay in the plant and soil for many years, and fruits were found to be contaminated. This is because the grape industry overused it, as it's effective for grapes.
Also I am against copper drenching or overuse of copper as a spray.
As long as the soil microorganisms are in balance, phytophthora and fusarium will not take over, unless overwatered and lack of oxygen.


[0] Message Index

[*] Previous page

Go to full version