Amaryllis is a flowering plant that is easy to bring to flower and returns year after year. However, there are a few viral diseases that can bring this bulb flower to its knees. Knowing how to recognize the signs of a viral infection in your amaryllis flowers and bulbs helps you keep your flowers healthy and happy.
This viral infection may also be called cucumber mosaic, because cucumbers can carry the infection. The virus makes the leaves and, possibly, the flowers of the amaryllis look like a mosaic, just like the name. Patches of yellow and green appear on the plant. Remove any weeds around the plant, because weeds can also carry the infection. Spraying with 0.2 percent malathion can eradicate the disease.
Also called fire spot, this viral infection creates red spots on the leaves and flowers of the plant. Overwatering tends to promote the development of this problem, and you can eradicate it using a copper oxychloride spray. To prevent this, you can dip the bulbs in benlate before planting.
Necrotic Spot Virus
Tomatoes also develop this disease; however, on tomatoes, it is called tomato spotted wilt virus. The virus creates pale spots on the leaves of amaryllis that look similar to small watermarks--much as if a glass had been left on a table without a coaster. This virus kills the plant it infects, and the only way to resolve the issue in your garden is to remove all infected vegetation. Dispose of the infected vegetation completely.