My vincas are dying (2nd post)

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My vincas are dying (2nd post)

Postby Helen Shickel » Mon Jul 20, 2015 8:56 am

In my post on July 17, I forgot to say that I live in Bridgewater, VA. Actually the leaves on my vinca are curling or rolling instead of wilting and then the whole plant dies. Some are dying and others in the same row are okay. Other flowers in the same area are not affected the same way. What could be the cause?
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Re: My vincas are dying (2nd post)

Postby lorijones » Wed Jul 22, 2015 2:43 pm

Are these the annual vinca (Catharanthus roseus) or the perennial vinca (Vinca minor or Vinca major)? From your posts, it seems like you have these planted directly in the ground and not in pots or window boxes. Is this correct?
Do you notice any spotting on the leaves or yellowing of the leaves in addition to the other symptoms? Are the stems turning black?
This sounds like one of the fungal diseases, perhaps aerial stem blight (Phytophthora). Aerial stem blight is pretty common in both the annual vinca and perennial vinca. It is more common under very moist soil conditions. One of the ways to help prevent the disease is to provide the plants with well-drained soil and avoid excess watering - keep your garden soil on the dry side. Luckily, both annual and perennial vinca are fairly drought tolerant.
Plants that are already infected should be removed - they cannot be cured. Fungicide applications (Bonide Fung-onil or Daconil) may help protect healthy plants when applied according to the label directions.
It is very important to allow the soil to dry out between waterings. This can be difficult if you have an automatic irrigation system - but you should be able to adjust it to come on less frequently.
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