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Rose Diseases - Bacterial and Viral - Page 3


© Mark Whitelaw
Page 3

Nov 21, 1997


Rose Streak - Brown bands appear on either side of leaf ribs, sometimes forming brown or green rings. Leaves may drop prematurely. Like most of the viruses, this disease is passed by grafting infected tissues.

Rose Leaf Curl - Another probable viral disease, manifesting as small leaves which may have yellow flecks along leaf ribs in the spring. Leaves may drop prematurely.

Rings - These could indicate any one of three diseases: Strawberry Latent Ringspot, Rose X, or Rose Ring Pattern. These diseases all manifest as random ring patterns on leaves. The accompanying symptoms are what distinguish them, one from another. Strawberry Latent Ringspot will be accompanied by short petioles and smaller-than-normal leaves. It is spread not only by grafting, but also by mechanical means and root-knot nematodes. Rose X's rings are accompanied by severe stunting with mottled green leaves which may have very fine, spiderweb-like line patterns. Rose Ring Pattern will show up as random rings amidst random line patterns on the leaves. Leaflets may appear yellow and blotched.

Next time, we'll take a closer look at fungal leaf diseases.

       

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Here's the follow-up discussion on this article: View all related messages
2.   Dec 1, 1997 3:28 PM
Carol,

That's a difficult question to answer since we don't know how hot or how large your community compost pile is kept.

For the most part, these fungal spores will be killed if the pile is ke ...

-- posted by Mark_Whitelaw
1.   Dec 1, 1997 1:29 PM
Mark, I'm anticipating your next article, but it's time for me to rake up all the fallen leaves from the roses that had downy mildew. And I have a question about how to dispose of them.

Composting ...

-- posted by CarolWallace



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