dying knockouts and county extentions...

avalonweddingsbcs(9)July 23, 2011

I have about 250 roses and a lot of them are knockouts.. i've starting loosing some and was wondering if i needed to call the county extention service or talk to the people who developed them at TAMU... They're only a couple of miles from me anyways..

knockouts are supposed to be disease resistant, however, our local npr station has a thursday call in and ask plant/horticulture questions and not too long ago they mentioned something about a disease that was attacking knockouts..

just curious if the county exention office are the people to call....

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WalnutCreek Zone 7b/8a(7b8a)

I bought 5 Knockout roses last year; they are all dead.

    Bookmark   July 27, 2011 at 5:40PM
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ltcollins1949(9a TX)

I have 3 Knockouts and they are all doing great! And I planted 6 Knockouts at my parents' house in north Central Indiana last summer and all of them survived their cold winter and have been blooming non stop this summer!

And yes, I would contact your County Extension Office for more information.

    Bookmark   July 28, 2011 at 11:56AM
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I have 50 of the sunny knock outs and one blush that are all on an automatic drip for 2 hours every other day (which equates to about 3 gallons of water each) they aren't real happy and the flowers are pitiful but so far no deaths (knock on wood). I have two more blush ones that are not on the drip and they are alive but have very few leaves and may not make it.

I hadn't heard about a disease, I assumed our trouble was drought related. Please let us know what your County agent says...

    Bookmark   July 29, 2011 at 3:40PM
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I'm in Dallas, and have lost one of my three Knockouts so far this summer, as well. One other one is looking pretty good, and the last one isn't looking very happy at all.

    Bookmark   July 29, 2011 at 10:28PM
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Knock out are fairly disease resistant but they are plagued by mildew and fungus. A few problems I have caused in the past with my roses are fertilizing at the wrong time. I hit my rose during the hot summer with a small amount of color star fertilizer and about killed them. I also made the mistake a year later with neem oil in the hot summer sun.. big mistake. This year I am just leaving them alone. I do have some yellowing leave and I need to find a fungicide I can spay during the hot summer day but I might just wait and let it work it self out.

    Bookmark   July 31, 2011 at 12:55PM
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