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Julie
Medium_rose_leaf Hi, I have yellow patches on one of my rose leaves.

It is in a v shape and seems to affect leaves on a branch here and there.

Submitted: 08:06PM, 07 Sep 2012
Answer: Hi Julie,
The rose is affected by mosaic virus. It is important to clean the secateurs when pruning or cutting flowers to avoid spreading this virus between different rose bushes. There is no treatment and generally the rose will not be greatly affected. The virus is not spread by insects.

I have attached an article from the Royal Botanical Gardens for your interest.

http://www.rbgsyd.nsw.gov.au/plant_info/pests_diseases/fact_sheets/pests_and_disease_of_roses

Category: Roses
Answered: 09:49AM, 10 Sep 2012

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