Thread: Quince Rust on young Hawthorn trees?

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  1. #1

    Quince Rust on young Hawthorn trees?

    Not entirely sure that's what's wrong, but I'm new to this. I wish I had been on top of it last year. There was some discoloration - but not having had hawthorn trees before, I thought it might be normal for them. (They were young bare-root "free trees" from arbor day last year.) But this year, it's pronouced, and definitely not-good-looking swellings. Here's pictures of the problem:




    (Had to put my hand in this one to get the stoopid auto-focus from trying to fosuc on the background)


    Is there treatment or should I just cut my losses and pull these out before they infect other trees that might be susceptible (I haven't seen any other Hawthorns in the neighborhood - but I don't know what else might succumb to it)?

  2. #2
    Oak
    Join Date
    Oct 2004
    Location
    Ocala, FL
    Posts
    535

    RE: Quince Rust on young Hawthorn trees?

    Yes, good call - that looks like cedar-quince rust, or maybe cedar-hawthorn rust. Any spots on the leaves?

    This is a native pathogen that's common in the environment, so I don't think you necessarily need to pull them up to protect other plants. Like other Gymnosporangium rusts, this one needs to alternate between hosts of different families to complete its life cycle, in this case between a large range of rose family plants (hawthorn, apple, pear, many others) and junipers (especially eastern red-cedar, Juniperus virginiana). So, the disease can't spread from the hawthorn to another hawthorn or an apple - it has to spread to a juniper first, where it develops into the form that's contagious to rose-family plants again.

    For this reason, apple orchard managers often eradicate the junipers that grow near their trees.

    There are sprays you can apply (timing is important). Check out this link:
    http://ohioline.osu.edu/hyg-fact/3000/3055.html

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