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Old 06-20-2018, 08:07 AM   #1
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Knockout Roses - Disease?


Hello,

I was hoping that someone could help identify the issue with my knockout roses. They were planted in spring of 2017 and have done pretty great up until recently. I did a bit of research, but I'm having trouble identifying the problem. They initially bloomed great this year, but now I'm getting no new blooms and they seem to be dying. I'm hoping to solve this and save these roses if possible.

We do have small slugs in the garden, hence the holes in the leaves. We've been using coffee grounds and garlic to deter them, and it seems to be helping the slug problem. After researching though, I'm not so sure the slugs alone could be killing the roses. There are 4 separate rose plants and they all seem to be dying. See pics.

Thanks!
The Pig
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Old 06-21-2018, 06:27 AM   #2
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Re: Knockout Roses - Disease?


Well, since no gardening people have jumped in to help you,
I'll give it a shot. Take your photos to your local gardening nursery
and ask them what would be the most effective product to use.

Also, buy some slug killer, I find that a lot of these home remedies
like, coffee grinds, hot pepper, moth balls, and meat balls are really
not all that effective.
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Old 06-26-2018, 10:23 AM   #3
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Re: Knockout Roses - Disease?


Thanks Joann. Now it's starting to look like the roses have rose rosette disease (RRD)... I think I'll be digging them up.
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Old 06-26-2018, 11:01 AM   #4
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Re: Knockout Roses - Disease?


Oh, you're welcome...you're not going to try and save them?
The knock out roses are nice, as they bloom a lot, and don't need
as much fussing over as regular roses do.

I just got the my head groundskeeper with mucho
whining and nagging) to cut down his three knock out rose drastically,
cause I want to re-plant the area with low growing evergreens
and rocks and annuals.

He admitted that it looks better now...I would like him to move his
beloved fig tree over about four feet, but he absolutely refuses!
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Old 06-27-2018, 02:13 PM   #5
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Re: Knockout Roses - Disease?


Based on everything I've read, once the roses are infected with RRD, there is no saving them. Will probably try to put new ones in.
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Old 06-27-2018, 03:45 PM   #6
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Re: Knockout Roses - Disease?


Good luck!
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Old 08-02-2018, 08:28 PM   #7
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Re: Knockout Roses - Disease?


I would try to salvage these - they don't look beyond hope.
Nuclear bomb salvation - has anti-fungal and anti-black spot properties. WARNING - dogs seem attracted to it https://www.bioadvanced.com/products...-care-granules. Water in well.
Your roses do look a little thirsty. I'm big on mulching - your babies are fairly much gonna cook faster in the sun without the cooling mulch.
They also could use a good trim. Use a bleach water solution to clean very sharp snips and cut off overly chewed up, blackened areas. You can be very agressive with knockouts and you're still inside active growing season.
If you're nervous about using the stuff above (it's my absolute last resort when fungal infections annually attack my more precious roses during Hurricane season), perhaps try neem oil or just an organic fertilizer after a good trim.
When I go on long vacation in the height summer, my knockouts look scraggely if we had a drought.
A big selling point on them is the lack of snipping needed - but like any rose, they really enjoy having spent blooms checked imo.
Those canes are too long, too. Cut canes to nearly the thickness of a pencil eraser is the old rule of thumb. Not entirely necessary for knockouts as opposed to clamberers, but those are pretty leggy.

Last edited by mpmp2121; 08-02-2018 at 08:31 PM. Reason: typo
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Old 08-03-2018, 08:38 AM   #8
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Re: Knockout Roses - Disease?


We grew some red KO's roses for a while 9 years ago and I dug them up after my wife ended up in the doctors office with "cellulitis" in her arm, from a thorn skin tear.
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Old 08-03-2018, 11:32 AM   #9
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Re: Knockout Roses - Disease?


They look like ours. Not KO...but a shrub rose from Oregon: Robert Clements...Douglas Gandy and Great Expectations.

Don't know what disease(s) they have and...don't care. I dug them out and put in pots far away from the garden about two months ago. Pruned them back by 2/3. They look better...but time will tell.

I have always hated roses. Too much trouble and still, they never look good. Always something. My theory is that women like roses because they are analogous to a husband: Keep trying to fix them....and then, maybe, you will end up with something worthwhile.
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