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Old 12-12-2003, 08:42 PM
Mark Whitley
Posts: n/a
Default does fungicide kill on contact?

Yes, of course I read the label and follow its guidelines.
But the labels on any fungicides I've read don't answer
my specific questions, such as how long the product
must remain on the tree in order to be effective.
And if the fungicide only prevents the infection, it seems
like there needs to be a continuous presence of the
fungicide to provide protection during all of the
vulnerable times. Again, there is nothing that
states that in specific terms, only vague and general
(like: 'during late fall/early winter'.) I understand that
labels can't be any more specific, as each site differs.
But it would be nice to have info, such as how many
inches of rainfall should be allowed to fall on the trees
between applications (so I could measure the rainfall,
and know when to reapply.)

But given the two answers I've seen, it is helful for me
to see the clarification that the fungicide is just killing the
spores. And I know what once infected, there's nothing
I can do (and I certainly don't want to put anything
systemic on the trees, I like to eat the peaches too!)


"Dwight Sipler" wrote in message
Beecrofter wrote:

As always start by carefully reading the label.
Then follow it.

This is not just a recommendation. The label is the law.

The deal with fungicides is that they prevent the infection they don't
cure it...

Depends on the fungicide and the extent of the infection. All the
fungicides I can think of will kill spores on contact, and if the spores
have germinated and invaded the plant, some fungicides will kill them
too. However, if the fungus has really gotten a hold on the plant you
need a systemic fungicide to cure it. Systemic fungicides are not
recommended on plants which produce food (or more precisely, eating the
plant products from a plant on which systemic pesticides have been used
is not recommended).