Tropicals & Tender Perennials: What causes this, 1 by

wrote:
It is generally thought to be caused by a virus. For a while plants like these were thought to be 'attractive' and cuttings would fetch high prices; some growers propagate this virus on purpose for that reason. However, it will weaken the plant and eventually cause it to die.
It is a good idea to keep an affected plant away from your others.

There is a different form of streaking which can be caused by excessive heat or some insect damage to the buds which is harmless; however, this is usually displayed as streaks that run with the shape of the petals, not blotched like what you are showing. Here is an example of the latter, which I had examined by a reputable grower who gave me this explanation.