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PEST MANAGEMENT DECISION GUIDE: GREEN LIST

Cucumber mosaic virus on celery

Cucumber mosaic virus (CMV)
  • The CMV is transmitted by aphids so prevent the entry of this vector into the crop:
    • Plant natural barriers around the field with non-susceptible crops like poaceae (e.g. maize)
    • Use floating row covers to protect the seedlings from the winged aphids in the first weeks. Remove for pollination
  • The seeds of infected plants can serve as inoculum so only use certified seeds
  • Avoid transplanting plants from affected areas or fields near to these areas or from susceptible crops
  • Remove weeds that can serve as reservoir plants (weeds and ornamentals are often asymptomatic) in and around the crop before transplanting, and continue to remove weeds throughout the crop cycle
  • The symptoms can vary widely depending on when infection occurs:
    • Leaves: at the beginning, vein clearing and mosaic patterns are seen and later leaves become yellow with vein necrosis
    • Petioles: look for brown spots to translucent sunken lesions (distinctive symptom of the Celery mosaic virus (CeMV)
    • Whole plant: if the infection is early in the development, plants are stunted with yellow leaves, show vein necrosis and show distinctive brown elongated lesions or translucent sunken lesions on the petioles
  • If the conditions are fresh or the infection happens late in the growing season, the symptoms may be hidden
  • Monitor for aphids and virus symptoms once a week, especially early in the season when the crop is more vulnerable to the virus. Apply control measures when aphids are seen in the field
  • Remove and burn the infected plants immediately
  • To reduce the propagation of the aphids:
    • Use yellow sticky traps to attract and kill the winged aphids
    • In the early morning or late afternoon, apply a solution of neem oil and soap (160-220 cc neem: 100 g of soap in 20 L of water) to both sides of the leaves
  • There is no chemical control for virus, and chemical insecticides are not efficient to reduce the aphid population that transmits the virus

CREATED/UPDATED: December 2014
PRODUCED BY: Plantwise

©CAB International. Published under a CC-BY-SA 4.0 licence.