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Niagara County, NY

wondering if truban(etridiazole) fungicide would be effective against pythium & phytophthora rot if used as a foliar spray? i would prefer to avoid soil drenches unless absolutely necessary as i understand drenches can lower mycorrhizae populations.

thanks- dan m

4/7/2006 9:48:41 AM

Ctpumpkin@optonline.net

Truban will take out some mycorrhyzae if used as a drench as will most pythium fungicides. But it won't work very well as a foliar treatment. Aliette (aluminum tris) would be the best foliar treatment for Phyto.

No matter either way.

Most of the time Pythium/Phyto affects seedlings. Start seeds in a sterile media. Soak all pots & other utensils in a chlorine bleach solution. Soak the seeds in a 50% Hydrogen peroxide solution over night. Keep the seed temp no hotter (or cooler) than 85°F during germination then drop it down to 78°F.

If you follow these steps I doubt that pythium will be a problem.

Or have you encountered phytophthora in the field?

4/7/2006 9:24:28 PM

Niagara County, NY

thanks- steve

i have not encountered phytophthora yet, atleast that i was aware of. i am just trying to put together the best preventive fungicide program that i can, covering as many diseases as possible. i have a long list of possible chemicals i can use, now trying to figure out which ones and in what rotation will be best.

dan m

4/7/2006 10:40:11 PM

Midwest

Good soil management will lower the chances of soil pathogens from taking over, ie. loosen the soil, don't over-water, till, introduce several species of beneficial microbes, etc.. Create an environment for the beneficial biology to thrive in will make it even better... Use a seed innoculant, mychorrhazal fungi, etc...

4/10/2006 1:35:49 PM

Ctpumpkin@optonline.net

Then in this case I agree that a well drained soil that is properly inoculated with beneficial soil bacteria (bacillus Subtilis) will probably stay free of these pathogens.

I'd not use Truban as a preventive. I've got a bottle collecting dust too. I hope it stays that way.

4/10/2006 10:38:38 PM