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Cree
assistant gardener
Australia
76 Posts |
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Mary-Anne
garden sage
Australia
10809 Posts |
 Posted - 16/01/2009 : 07:27:00
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Interesting, Thankfully I dont have problems like that YET !!!
And hope I never do..
Friends are the flowers in the garden of life
Love Your Enemies... It Will Drive Them Nuts |
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jimmy08
dirt-poker
10 Posts |
Posted - 17/01/2009 : 18:24:02
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Hi Cree,
Just wondering if you could diagnoise this problem:
This rose is growing in a pot, and every Summer new leaves show up those speckles.
TIA,
Jimmy
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Cree
assistant gardener
Australia
76 Posts |
Posted - 18/01/2009 : 10:57:43
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Hi Jimmy
I am having trouble seeing the leaf well. It looks like small blotches of yellow on an otherwise normal appearing leaf? Is the whole leaf a little yellow compared to it's normal colour too?
RMV is very common, so is always high on the list of suspects.
RMV can appear in a number of different ways, yellow veining, water marks and yellow blotches are a few ways. The amount of discoloration can vary, from very slight tiny areas to very obvious large areas. It can also be very faint and barely visible or very evident.
RMV leaf symptoms appear and then disappear, but will follow the same pattern each year depending on your climate. Where I live, the first spring leaves look normal. I will start to see discolorations during or after the first blooming. Then as it really heats up, the new leaves are again normal and by then most of the affected leaves have fallen off. On evergreen roses, the leaves do not fall off as often, so it might seem that plant has the symptoms year round, but if you notice the new leaves as the season progresses they will not be affected.
Leaf hoppers and a couple of other insects can cause yellow blotches on leaves, this type will feed on the undersurface of the leaf. Then can be present for a short period of time, do their damage and move on. Then you notice the leaves and by then there is nothing there. However I do not think an insect would attack only one plant and ignore all the rest and that this pattern of attack would repeat at the same time each on only one plant.
Nutritional deficiencies is another thought. I would guess since this is a potted rose that you feed it once in a while which would also decrease the likely hood of a deficiency. Also a deficiency is not too likely to to show up at the same time each year, but it is possible. If you feed your plant then the symptoms will disappear. For example the yellow of leaves with green veins seen in Iron deficiency, once treated, the leaf returns to it's normal colour. This will not happen with RMV, the leaf retains the discoloration until it fall off.
I hope this helps you figure out what it is. If it is RMV I would not be too concerned. You can have a rose for some time before it shows the symptoms and then others will be evident the very first spring. There is nothing you can do about it and will not to spread to your other roses under normal garden conditions.
There are some plants such as Peace where it is almost if not impossible to find a rose that is not affected. Other have got it from their root stock. I keep tract of where I buy roses with RMV, if I start to see too many from that nursery then I go elsewhere. |
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RoseMeadow
assistant gardener
Australia
151 Posts |
Posted - 12/02/2009 : 21:40:38
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Thankyou Cree for this imformation and photos of RMV and Magnesium Defieiency.
Karen Adams |
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Topic |
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veins