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Fungus


Question
You answered a question about my roses and said I had black spot.  The answer was good, but it did not address the issue of the other foliage looking deformed.  Will black stop do this, also?  The foliage seems stunted and shriveled.  Is the also caused by black spot.  I live in the south, so the roses bloomed all year round.  No growth has appeared in over a week since they were pruned.  Is this normal?

Answer
Sorry for the omission. I hope that it is the black spot that is causing the roses to not grow right because if it isn't then your roses could have a virus and that is very serious. Black spot slowly drains way the vigour of the rose bush and so encourages more diseases as the rose can't fight them off. The fungus can in time, cause the bush to not grow well but usually it is seen by thin canes and more black spot plus dead leaves. If the fungus has really taken a hold, then the plant canes will just dry out and die back. It normally doesn't cause stunted an shriveled growth. This type of growth can be caused by the rose re-acting to a spray, especially an insecticide. Even a herbicide that has floated on the air will cause it. The last cause, and I hope not, is a virus. Roses get a virus called mosiac and it usually shows up in the leaves like someone has dribbled yellow paint of them. But many times it is in the plant and doesn't appear until something else weakens the plant. Then it can appear as stunted and deformed leaves. I would cut the plant right back and then check to see if the new growth is normal. A virus is not catching as it is in the sap of the rose bush but there us no  cure for it once the rose has got it.

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