Zucchini Yellow Mosaic Virus


Melon aphids, a vector of ZMYCMelon aphids, a vector of ZYMV
Leaf distortion and discoloration due to infectionLeaf distortion and discoloration due to infection
Foliage with mosaic discolorationMosaic pattern on foliage and discolored fruit
Discolored and distorted zucchini from infected plantDiscolored and distorted zucchini from infected plant

HOSTS

  • Cucurbits

DESCRIPTION

Zucchini yellow mosaic virus (ZYMV) is caused by an RNA virus called a potyvirus. ZMYV is primarily spread by aphids, although it can also be spread through the use of infected seeds.  

BIOLOGY

ZYMV is primarily transmitted by aphids, including melon and green peach aphids. When an aphid feeds on the sap of an infected plant, they will also acquire the virus. ZYMV is spread non-persistently, meaning after an aphid has fed on an infected plant, they will only transmit the disease for a short period of time. 

Using seeds from infected plants can also introduce the disease to fields and gardens. 

SYMPTOMS

  • Stunted and deformed growth of leaves and flowers 
  • Fruit that is discolored and distorted, including raised lumps 
  • Yellow mosaic pattern on foliage 

GENERAL MANAGEMENT

  • Use certified disease-free seeds.
  • Manage aphid populations 
  • Dispose of plant debris and infected plants.  
Insecticides for aphids are of limited value to control this disease. 
There is no treatment for ZYMV after infection. 

 

 

 

 

 

 

 





 








Precautionary Statement: Utah State University and its employees are not responsible for the use, misuse, or damage caused by application or misapplication of products or information mentioned in this document. All pesticides are labeled with ingredients, instructions, and risks, and not all are registered for edible crops. “Restricted use” pesticides may only be applied by a licensed applicator. The pesticide applicator is legally responsible for proper use. USU makes no endorsement of the products listed in this publication.