Dahlia Viruses
In the case of virus infections there is at present no cure, so that the only thing to do is to prevent the infection spreading. Therefore the insect vectors must be killed before they have a chance to transmit virus, whether or not they are carrying the infection. A dahlia which has been the object of a serious infestation of either thrips or aphides may not become infected with virus, but it is much better to be safe than sorry.

