Is this little thing really what's destroyed my gardens?

[z_willus_d]

Originally Posted by Paradajz

hi, N.

no, only myclobutanil is a Triazol there, trifloxystrobin, pyraclostrobin and azoxystrobin are all Strobilurins ( synthetic, but with a fungal ancestry actually ).

if you still chose to test some of those aiming for L.T. my advice is to use myclobutanil, Triazoles are not very likely to cause any resistance that soon.

Strobilurins on the other side are excellent fungicides, not agressive and mainly traveling trough leafs only ( local- systemic is the term in my language ), with extremely broad spectrum ( practically all 4 existing groups of pathogenic fungi ), but with a somewhat less effective action than Triazoles, and highly problematical on the resistance side. therefore, if you use those mix it with mankozeb/propineb at regular doses. my advice there is pyraclostrobin as first choice, although trifloxystrobin has some nice additional effects on a plant ( helps photosynthesis ).
anyway, this group shouldn't be used more than once for P.M. with a strong recommendation for a combination with some broad contact fungicide, and even stronger recommendation of using a fungicide of completely different system of action if there happens to be another treatment for P.M.

br,
ivan

Hi Ivan, thanks for all this great information. I wasn't actually planning to use any of these "atomics," wouldn't know where to find them if I was, but I would like to better understand them, how they're used in industry, their limitations, etc.

From what I gather from your above, the optimal (from the point of view of decimating a P.M. infestation) spray scheme would involve first an application of pyraclostrobin followed up (5-7 days later?) by an application of myclobutanil. The goal being to hit the fungi hard with the broad action pyraclostrobin but also take out the "stragglers" with the myclobutanil, so as to minimize any resistance population. Or were you suggesting the same, but with the first application of pyraclostrobin to include also a tank mix with mankozeb? I know that some of these are used on grapevines here in CA to treat P.M.

Thanks again for the details.
-naysen