In most cases the initial effects of the virus are not significant but build up over a period of time to produce effects that can become quite considerable. There are only two effective strategies to control these diseases. The second and most important is to ensure that there are very stringent hygiene procedures in place to minimise the spread of the virus from plant to plant. Sterilisation of cutting implements between plants is essential. These viruses do not spread by insects or any other vector.
Symptoms are a downward curling of leaves, epinasty and premature leaf drop.
The colour of the leaves is often very weak and the whole growth of the plant is very poor. Plants with these symptoms should be removed and disposed off in the rubbish. Purchase plants only from certified growers. This fungus most commonly causes a rot and premature senescence of flowers. Grey brown fungal growth may be evident on affected flowers.