Someone answered that Aliette is very helpful for stressed pines
Aliette as far as I know is a systematic fongicde and might
destroy the Michorrize ..

Aliette works against oomycetes, so it won't harm mycorrhizae. However, using systemic fungicides as a "tonic" is a terrible idea, since it allows resistant strains of fungi to develop. French nursery growers will not be happy.

On Long Island, we did a survey of oomycetes in greenhouses, and I was in charge of testing their resistance-- I found isolates differing in their resistance by 3 orders of magnitude. We advised the nurseries with sensitive strains to never use the same
fungicide twice in a row; in that way, the strains would continue to be sensitive. The ones with resistant strains could only throw out their plants, sterilize the greenhouse, and hope for the best.

Nina, who will soon be testing the reaction of the "sudden oak death" pathogen to Aliette.

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