"I am not aware of specific fungicides to treat citrus Greasy spot disease"
Maybe misunderstood or poorly translated.
It may not be specific, but must be available on the market. Other climate, other cultivated crops, other demand for fungicides.
In the Czech Republic :
1. Each fungicide must be registered and tested. Registration is for a high fee and is only valid for a limited time. If it is little sold, the manufacturer will not renew the registration and the product will stop selling.
2. Part of fungicides may be sold freely, part only to holders of permits for the handling of dangerous or environmentally damaging substances. Getting this privilege requires the appropriate education, passing the exam and of course paying the fee. Normal people who do not live with farming do not have this right.
What is not specific to you may be specific to me (if I can not buy it in the store, it's specific to me
)
"Treatment for greasy spot fungus is easy enough. The best treatment around is to use one of the copper fungicides out there and spray the tree with it. Use the copper fungicide according to directions in order to kill the citrus tree fungus."
Hmmm. There is nothing more to say.
Just : Come and show how easy it is! None of the fee available fungicides in the Czech Republic against the Greasy spot does not work. This is not just my experience, they are also in the big garden with citruses (ADAVO, https: //eshop.rakytnik.com/katalog/zbozi/citrusy, I think you know it) and many others. Of all free available fungicides, the Greasy spot will limit only one. It is based on copper - the active substance is copper oxidchlorid. It only reduces but nothing more.
In the category of fungicides sold only to holders of the authorization are fungicides, where they really apply then: Treatment for greasy spot fungus is easy enough.
Ilya, it's my personal experience, not that somewhere he said, somewhere he wrote.