There's the fact that some viruses in apple (trees) have an impact on
apple colour and sweetness. For legal reasons, the nursery material
has to be certified pathogen free and when trees are been selected for
breeding, they are tested. When positive they can be (heat) treated to
drive out the virus. When virus free, the apple sometimes is nothing
special anymore.
Whether the virus in this case is only beneficial for us and not
harmful for the tree, I don't know.
Rene.
weissm at rockefeller.edu (Martin Weiss) wrote in message news:<p06002002bb8cc63eeae7@[192.168.1.115]>...
> The public perception is that germs are bad and to be
> avoided. Most-about 1% of microorganisms-are not pathogenic. Most
> examples of beneficial or benign microorganisms are bacteria. What
> about viruses? Are there examples of viruses having a positive
> effect? Benign might be difficult to document.
>> Cheers,
>> Martin
>> --
> Martin Weiss, Ph.D.
> Director of Science
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