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How to Identify, Control, and Prevent Mosaic Viruses

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Learn About the Various Types of Mosaic Viruses

Catherine Boeckmann
Pest Type
Plant Diseases
Plants Affected
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How to Grow Tomato Plants: The Complete Guide
How to Grow Watermelon Plants: The Complete Guide
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Ever looked at your beautiful vegetables or flowers and noticed strange splotches or stunted growth? The culprit might be a mosaic virus!  These nasty plant diseases can infect various greenery, but fear not!  This guide will equip you with the knowledge to identify, control, and prevent mosaic viruses, keeping your garden thriving!

What Are Mosaic Viruses?

Mosaic viruses affect more than 150 types of plants, including many fruits, vegetables, and flowers. The disease is characterized by leaves mottled with yellow, white, and light or dark green spots and streaks (in other words, a 鈥渕osaic鈥 of these colors). Some of the most commonly infected plants include tomatoes, squashes, cauliflower, and cucumbers, but many more are susceptible.

Types of Mosaic Viruses

There are many mosaic viruses that commonly affect plants in the vegetable garden, including:

  • Bean Common Mosaic Virus (BCMV) and Bean Yellow Mosaic Virus (BYMV) are the primary mosaic viruses that affect beans of all types. Aphids typically spread them, but BCMV is also seed-borne, so do not save seeds from infected plants. 
  • Cucumber Mosaic Virus (CMV) is one of the most common mosaic viruses and tends to be spread by aphids. As can be inferred from its name, cucumber mosaic virus often affects cucumbers, but it is also a common problem for many other garden plants, including other cucurbits (melons, squashes), nightshades (tomatoes, peppers, eggplants, potatoes), and leafy greens (lettuce, spinach).
  • Tobacco Mosaic Virus (TMV) spreads through seeds and direct contact, and the best way to avoid it is to grow resistant varieties. 
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Identification

How to Identify Mosaic Viruses and Damage

Viral diseases are difficult to identify because symptoms vary from plant to plant and may also vary depending on the age of the plant and its growing conditions. However, the most common ways of identifying mosaic viruses are listed below.

  • The leaves are mottled with yellow, white, and light and dark green spots, which appear to be elevated. This gives the leaves a blister-like appearance.
  • Plants are often stunted, or they grow poorly.
  • Plants may have other deformities, and their leaves may be crinkled or wavy. 
  • Cucumber mosaic virus: Infected plants are stunted and often exhibit 鈥渟hoestring syndrome,鈥 a characteristic malformation in which the edges of the leaves fail to develop, with the leaf veins developing as long, narrow strips. Tomatoes are small and misshapen.
  • Tobacco mosaic virus: Infected plants have mottled, yellowed leaves and twisted or deformed young growth.
cucumber mosaic virus on spinach leaves
Cucumber mosaic virus causes severe damage and discoloration to a spinach plant.
Photo Credit: University of California. 
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Control and Prevention

How to Control Mosaic Viruses

Once plants are infected, there is no cure for mosaic viruses. Because of this, prevention is key! However, if plants in your garden do show symptoms of having mosaic viruses, here’s how to minimize the damage:

  • Remove all infected plants and destroy them. Do NOT put them in the compost pile, as the virus may persist in infected plant matter. Burn infected plants or throw them out with the garbage.
  • Monitor the rest of your plants closely, especially those that are located near infected plants.
  • Disinfect gardening tools after every use. Keep a bottle of a weak bleach solution or other antiviral disinfectant to wipe your tools down with.

How to Prevent Mosaic Viruses

  • Plant virus-resistant varieties in your garden. Resistant varieties of tomatoes have yet to be developed for cucumber mosaic virus, but tomatoes that are resistant to tobacco mosaic virus may have some slight resistance to cucumber mosaic virus as well.
  • Mosaic viruses are mostly spread by insects, especially aphids and leafhoppers. You can try covering your plants with a floating row cover, or aluminum foil mulches to prevent these insects from infecting your plants. Look at our other tips for controlling aphids.
  • Control your weeds. Some types may serve as hosts for the disease, and when aphids and other insects feed on these plants, they will spread the viruses to your garden plants.
  • To avoid seed-borne mosaic viruses, soak the seeds of susceptible plants in a 10% bleach solution before planting.
Plant Disease
About The Author

Catherine Boeckmann

Catherine Boeckmann loves nature, stargazing, and gardening so it鈥檚 not surprising that she and The Old Farmer鈥檚 蜜桃恋人 found each other. She leads digital content for the 蜜桃恋人 website, and is also a certified master gardener in the state of Indiana. Read More from Catherine Boeckmann
 

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Comments

You may have powdery mildew disease. Try using an horticultural oil spray or mix milk and water in a spray bottle and use it on your plants. Use 3 parts milk to 7 parts water. Milk has been proven effective against powdery mildew.

AmberH (not verified)

11 years 3 months ago

Hi, I think my cucumber plant may be infected, and it is close to my bean plant (climbing vine variety). Can my beans get this virus?

Unfortunately, the cucumber mosaic virus can be transmitted to your beans.  It's carried by aphids. You will need to destroy any infected plants and avoid planting these crops in the same space next year.

phearen (not verified)

11 years 6 months ago

i have the problem with my eggplant because of mosaic virus! the eggplants which is covered by plastic mulch and equipped with drum drip irrigation are infected by the Mosaic virus and Aphids. Is there any correlated between plastic mulch and Mosaic virus?

We do not know of a correlation. Eggplants respond favorably to being grown on plastic mulch with drip irrigation. According to our extension office, "Winged aphids are repelled by silver- or aluminum-colored mulches. If there is a probability of severe virus pressure, place reflective polyethylene mulches on planting beds before seeding or transplanting to significantly reduce rate of colonization by winged aphids and delay the buildup of damaging numbers of aphids by 4 to 6 weeks. While this approach is mainly effective in delaying or reducing the incidence of virus diseases transmitted by winged aphids and whiteflies, reflective mulches can also delay the buildup of wingless aphids that arise as a result of colonization by winged individuals. The mulches lose their effectiveness when more than 60% of the surface is covered by foliage or if the mulch becomes fouled with dust or soil. Therefore, they are effective only for the first few weeks after transplanting."

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