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Q.How To Apply Mancozeb To Norway Maple Trees To Prevent Tar Spot On Leaves

Zone Mississauga, Ontario, Canada (near Toronto) - zone 5 | Anonymous added on November 26, 2021 | Answered

I have some Manzate 200 wettable powder (80% mancozeb). Please advise solution mixing strength and if a sticking product (such as liquid dish soap) can used. Should the mixture be applied to the tree trunk or as a soil drench? What is the best time of the year to apply in the Mississauga, Ontario (zone 5) area? Any other useful information would be appreciated. Thank you.

GKH_Susan

Certified GKH Gardening Expert

Answered on November 27, 2021

The article below gives amounts to use, plus follow the instructions on the Manzate container. The Manzate instructions say to use a spreader-sticker if needed. You will spray it on the leaves beginning at bud break. See more below:

https://agsci.oregonstate.edu/sites/agscid7/files/horticulture/osu-nursery-greenhouse-and-christmas-trees/onn100110.pdf
http://hyg.ipm.illinois.edu/pastpest/200220c.html
https://www.gardeningknowhow.com/ornamental/trees/maple/maple-tar-spot-disease.htm

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