symptoms of cucumber mosaic virus on leaves

Cucumber mosaic virus symptoms
Dr Parthasarathy Seethapathy, Tamil Nadu Agricultural University,

Updated: February 20, 2023

Vegetable viruses

  • Specific virus diseases are difficult to distinguish and produce a wide range of symptoms including stunted, slow-growing plants, twisted, crinkled, cupped, or deformed leaves, and leaf discoloration (yellow mottling and mosaic patterns, ringspots, and dark-green banding). Viruses can cause colored circles or mottling (alternate dark green and light green or yellow streaks) of fruits. 
  • Viral symptoms are usually first observed on foliage.
  • They can possibly infect bean, pea, pepper, cucumbers, squash, melon, and tomato plants.
  • Aphids, thrips, and leafhopper feeding transmit most viruses common in Maryland.
  • Tobacco mosaic virus (TMV) is mechanically transmitted by tools and handling plants.
  • Viral diseases are systemic and symptoms tend to progress and worsen through the season.
Squash leaf with virus symptoms
Summer squash leaf showing virus symptoms
pepper infected with virus symptoms
Small, irregular fruit with dark splotches on pepper caused by tomato spotted wilt virus
David B. Langston, University of Georgia,
distorted cucumbers caused by a virus
Cucumber mosiac virus symptoms on cucumber fruits
William M. Brown Jr.,


  • If viral symptoms extend to edible plant parts, the entire plant needs to be removed and discarded. Pods with minor viral symptoms are edible and will not cause health problems.
  • Control weeds around the garden and insect pests that suck plant sap.
  • Grow or purchase transplants resistant to TMV.

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