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Advice needed - Greg Chappell
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Posted by MtNebo_Jackie SE Qld, ranges, (My Page) on Sun, Aug 14, 05 at 19:57
| Hi All
I planted a 3' standard Greg Chappell a month ago following the same procedure as for 6 other standard roses. Whilst the others are happily developing nice healthy leaves GC produces tiny leaf buds which may or may not produce tiny leaves which then wither and die. Whilst he may not have as much sun as some he does get more than others.
Can anyone shed light on to what may be causing his discomfort?
tia
Jackie |
Follow-Up Postings:
RE: Advice needed - Greg Chappell
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| Hi Jackie, Sorry I can't help with your problem, I am posting to ask if you are coming to our fun catch up of SE Qld rosies on Sun 4th of Sept at New Farm Park? We would love if you could come and someone there might be able to help you with your problem. Cheers, Brissy |
RE: Advice needed - Greg Chappell
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Almost certainly downy mildew.Unlike black spot kills foliage from the growing point backwards to the base.Unlike powdery mildew it requires water in which to germinate (4 hours) and thrives in cool temperatures. Any shading at all is likely to increase your rose bush's likelyhood of contracting it, as this will contribute to cooler temp's and free water remaining on leaves longer. Since the disease is spread by splashing water, it most certainly was infected at the time of purchase since your other roses are not infected (yet).Bare rooted roses can, and commonly do carry this disease.
You will need to spray (important to cover undersides of leaves where spores are produced) and eliminate all fallen leaves.
On the brighter side our hot Qld weather is great for killing this disease off, but you may have to wait a couple of months for the temps to rise.Keeping foliage dry will prevent spore germination of downy mildew.
Downy mildew must be controlled as it often results in the death of young roses.Nurseries should not sell infected plants. It is within their abilty to control this disease, (just),while gardeners often have great difficulty diagnosing and erradicting/controlling it.
Good luck Jackie
Thrip |
RE: Advice needed - Greg Chappell
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| Hi Thrip Many thanks for your response - I was sure it was something someone could identify. We have a drip irrigation system so water on the leaves should not be a problem from watering. I'd agree with your assessment of it being diseased before purchase as the other roses planted at the same time are healthy. Hate to show my ignorance, but what should I spray with? Jackie |
RE: Advice needed - Greg Chappell
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It has been proven that downy mildew will reside permanently within within a rose bush, once it has been infected (I know thats sounding drastic but there would be more roses carrying the infection than not and growers/gardeners still seem to cope). The visible symptoms and associated damage to leaf and stem tissue will only manifest when weather conditions are favourable (ie. cool and wet).It's at these times that chemical treatments can be used to minimise damage.I will directly email you the info on chemical treatments .
Thrip |
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