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Winecrisp Apple Fungicide #874800

Asked June 26, 2024, 12:51 PM EDT

Hello, I have a 2 year old Winecrisp apple tree that I bought because it was advertised as immune to apple scab that I have had with some of my other apple trees. Although I have not seen any scab on the leaves it seems to have rust and leaf spots (see photo). I have read that I shouldn't use chemical fungicides on it but want to get the rust/spots under control. I use Immunox on my other apple trees for scab with success and wanted to know if I can use it also on the Winecrisp. I also have a Reliance grape vine that was advertised as resistant to Antracnose but seems to have black rot. Can I use the Immunox on it? Thank You, Ken

Frederick County Maryland

Expert Response

Hi- yes, you can apply Immunox to apple trees to control rust diseases.
Univ. of MN rust page

Black rot is the most significant grape disease for home gardeners. Immunox (myclobutanil) is an effective synthetic fungicide for rusts and black rot of grapes. 
Black rot pages:
 https://extension.umd.edu/resource/growing-grapes-home-garden/
https://extension.psu.edu/black-rot-on-grapes-in-home-gardens

We recommend that backyard fruit growers use VA Extension's guide to fruit pest management:
https://www.pubs.ext.vt.edu/456/456-018/456-018.html
Click "Home Fruit" in the right sidebar.
Jon
Answered by the Home and Garden Information Center (HGIC), University of Maryland Extension. For timely gardening information and tips, subscribe to our Maryland Grows blog and quarterly newsletter. Follow us on Facebook, Instagram, and YouTube. Replied June 26, 2024, 1:56 PM EDT

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