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Discussion id : 110-701
most recent 13 MAY HIDE POSTS
Initial post 13 MAY by Margaret Furness
Can someone tell me please: how close to old Juglans regia (common / English / Persian / Circassian walnut) trees can roses safely be planted? Are roses more or less sensitive to juglone than apple trees are? How long does the ground stay poisoned with juglone after a walnut tree is removed?
Reply #1 of 2 posted 13 MAY by Andrew from Dolton
If all the leaves are raked-up well in autumn most plants and the lawn will grow reasonably well near a walnut tree. What can retard a plant's growth is the dense shade the leaves cast rather than any poison they contain.
Reply #2 of 2 posted 13 MAY by Margaret Furness
Thank you.
Discussion id : 95-591
most recent 1 NOV 16 SHOW ALL
Initial post 27 OCT 16 by timdufelmeier
Have you had a problem with Rose Rosette type symptoms ( without the redbroom formation):
Weird rootstock growth growing from the tops of normal canes, brown streaked or brown sepals, deformed, small blooms? I live in LA, Ca. and my 150+ rose garden has many casualties with these symptons. Noticed them in other LA rose gardens too. A friend in San Bruno (San Fran area) has complained of the same. Do not uses any pesticides nor fungicides.
Reply #1 of 5 posted 28 OCT 16 by Nastarana
Without seeing the damage, it sounds like herbicide damage. I found when I lived in CA that my roses had extremely low tolerance for herbicides, even spray directed downwards to eradicate Bermuda Grass would still cause RRD looking damage to roses. Do you live along side a county road which is heavily sprayed by the public works dept.?
Reply #2 of 5 posted 28 OCT 16 by timdufelmeier
Thank you for your response. Most people that I've spoken with have suspected chemicals also but I have never used fungicides insecticides nor Roundup. This problem seems to have been affecting rose beds all over La since mid-summer. I know the California Department of Agriculture monitor citrus trees in my yard which is dead center in the middle of LA I can't imagine that they would have sprayed without our knowledge
Reply #3 of 5 posted 28 OCT 16 by timdufelmeier
Kim Rupert thinks that the problem is Chilli thrips which have been a problem in Florida and Texas for a while and they affect ornamentals and crops. I have never seen anything like this mess on roses since I started gardening in the late eighties in Los Angeles. Expert had written him a solution involving several heavy-duty chemicals and I'm not sure I am up 4 dealing with the problem in that way
Reply #4 of 5 posted 31 OCT 16 by Steven Cook
Do thrips in general cause symptoms similar to RRD? I dug out a very common rose I didn't really like and am trying to convince a neighbor to dig out a Don Juan that he and I both like because they showed the over-vigorous but deformed growth exhibited with RRD. If it's thrips, I'm overreacting. After I told him about the RRD, and that it needs to come out, he instead cut it back by two thirds in the belief he can eliminate the infection.

I'd like to plant more roses, but if my neighbor is cultivating an RRD-infected rose and refuses to get rid of it, I'm wasting time and money and, I can't grow roses at my place. That makes me sad. If it's thrips, I'll deal with it.
Reply #5 of 5 posted 1 NOV 16 by timdufelmeier
Kim wrote that RRD is not a problem in Calif. Not sure about DC. Message him with pix
Discussion id : 88-843
most recent 24 OCT 15 HIDE POSTS
Initial post 24 OCT 15 by EFR
Please see attached photos of a sick Iceberg rose in our garden.
All other Iceberg roses next to it are very lush and healthy.
Can you please suggest how to deal with this issue?
I live in Melbourne Australia. We are now (late October) at the end of Spring.
Reply #1 of 2 posted 24 OCT 15 by Patricia Routley
Take a close look at the stem - and graft. It is not being strangled is it?
Reply #2 of 2 posted 24 OCT 15 by EFR
Yes, it is very tight, but the same applies to all the other roses. So I am not sure if this is the reason. Regardless I will loosen all the strings that tie the roses to their posts.
Thank you.
Discussion id : 72-390
most recent 15 JUN 13 HIDE POSTS
Initial post 15 JUN 13 by Frhoden
My Mothersday Polyantha looks bad and the other roses I have look good. It looked very healthy early in the spring but now some of the leaves have brown starting on the tips and then advancing further up. Also, the leaves look tattered, like a wind blown damage. I am wondering if Polyanthas are susceptible to hot temps early in the season which is what we have had. This rose looked bad this way last year when we also had unusually high temps early but I had transplanted it the prior year so I thought that was the problem then. Now I am perplexed as to cause. I wondered if anti disease sprays could cause this damage but none or most of the other roses do not show problems with sprays and it had shown no problems in the past. I have added insecticide spray to my regimen but as with the other spray, none of the others have had problems. I spray in the evening also. Any helpful suggestions or knowledge of polyanthas?
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