This appears to be a fungal problem of some kind, most fungal issues are caused by fungal spores that over produce, especially during the wet weather season. For the most part, fungal diseases can be prevented by utilizing proper cultural practices such as variety selections, irrigation and humidity management, plant and soil nutrition, pruning, and row spacing. When there is inadequate circulation of air, poor water drainage, exorbitant irrigation, and too much dampness due to rainfall, the fungi can become a problem. Some fungal issues cannot be cured, other fungal issues can be organically controlled with products like Actinovate or Neem Oil, cornmeal, homemade vinegar recipes and more can make a difference depending on what fungal issue you are trying to control. In this photo we are unable to determine the specific fungal issue, so recommend you take a cutting of the plant to your locally owned garden center where a horticultural expert can advise a specific organic treatment. If this is not an option, consider contacting an extension office from a local college as experts there will be able to guide you in the treatment of this plant.
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