High temperatures tend to suppress symptom expression. Poinsettia Mosaic Virus is an excellent immunogen. Poinsettia Mosaic Virus is often found at very high frequencies of infection, up to 100 percent in some poinsettia crops. Infection of crops with this virus is sometimes overlooked or ignored due to the fact that it often produces no visible symptoms. However, PnMV can cause mosaic symptoms on leaves of infected plants.
High temperatures tend to suppress symptom expression.
Poinsettia Mosaic Virus is an excellent immunogen.