Viruses—Potyviruses, Mosaic viruses, Cucumber
aphidborne yellows, and Lettuce infectious yellows
Symptoms of virus diseases include mottling of light green, yellow, or white areas on leaves, clearing
of veins, thickening of leaves, and reduction in growth and yield. Fruit may be deformed.
Life cycle
Solutions
Viruses are transmitted by insects, such as aphids, whiteflies, and cucumber beetles. Remove infected
plants as soon as they are detected. It is not practical to try to control virus diseases by using insecticides
to control insects. Using aluminum
foil as a soil mulch may reduce or delay infections as it helps repel
insects from plants. Covering young plants with row
cover can also protect them from insects.
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 Watermelon
mosaic virus on squash
 Mottling
caused by watermelon mosaic
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