ToLCNDV Information Center - Updates from Syngenta Vegetable Seeds on New Delhi Virus in Cucumber, Melon, and Squash

ToLCNDV Information Center

Updates on Tomato Leaf Curl New Delhi Virus (ToLCNDV) resistant varieties and information to support cucurbit growers dealing with ToLCNDV.

info The information on this webpage reflects industry best practices and should not replace agronomic expert advice. This information alone should not be used to diagnose or treat any crop disease

Syngenta Develops Tomato Leaf Curl New Delhi Virus Resistance in Cucurbit Crops: Cucumber, Squash, & Melon

ND Protected Logo for ToLCNDV-resistant Varieties from Syngenta Vegetable Seeds

Growers in key cucurbit production areas are looking for solutions for an emerging and rapidly spreading virus called Tomato Leaf Curl New Delhi Virus (ToLCNDV). Because of this, Syngenta has invested in creating solutions for three key crops.

Because of this investment, today there are varieties with resistance to this virus:

  • In Cucumber, look for Siriana ToLCNDV-resistant cucumber.
  • In Squash, look for Alpha or Delfos ToLCNDV-resistant squash.
  • Follow Syngenta Vegetable Seeds for more information on Piel de Sapo melons as trials are conducted.  

When researching for ToLCNDV-resistant varieties, look for the ND Protected seal to know you’re getting a variety from Syngenta Vegetable Seeds with resistance to Tomato Leaf Curl New Delhi Virus.

“We identified this virus as a potential issue for melon, squash, and cucumber crops years ago. Because of this, our research and development teams started working diligently to identify resistances in each of these crop types to support growers.”
- Pedro Pleguezuelo, Syngenta Portfolio Manager for Melon and Cucumber. 

What is Tomato Leaf Curl New Delhi Virus (ToLCNDV)?

ToLCNDV has been found in cucurbit species including squash, cucumber, and melon in key growing areas. It’s especially active in Italy and Spain, but it’s spreading rapidly.

Left unchecked, it can reduce yields and crop quality due to damage caused to leaves and fruits by symptoms of the virus.  

Crop losses from ToLCNDV (also called New Delhi Virus) causes curled, crinkled leaves, vein swelling, yellow mottling, shortened plant height, and, worst of all, poor fruit set that indicates a near total crop loss in squash, melon, and cucumbers.  

“This virus is widespread and especially active in the Mediterranean Basin,” said Peter Szungyi, Syngenta Vegetable Seeds Portfolio Manager for Watermelon and Squash. 

The disease pressure can be high in open field environments, but viruses like ToLCNDV can be often found in protected crops where it can quickly spread and cause damage.

Spain, Italy, and Morocco have identified the biggest infestation of the virus, but it has been discovered in many additional areas where squash is grown. 

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“The number one priority for growers should be to prevent the virus vector from entering fields and tunnels, but we know that’s not always possible,” Szungyi said. “That’s why finding varieties with resistance is such a high priority.”

Whether the resistance to a pathogen is discovered by crossing elite materials or by crossing with related wild biotypes, the varieties developed and made available for growers must provide the same high yield potential, good plant characteristics and quality of fruit they’ve come to expect.  

With the efficiency of a data-driven breeding methodology, Syngenta researchers can identify and select high potential parental lines to focus their efforts on developing New Delhi resistance and, in turn, offer more favorable varieties to the growers.  

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Peter Szungyi Syngenta Vegetables Portfolio Manager for Watermelon and Squash

“Preventing the ToLCNDV virus vector, such as whitefly, from entering fields and tunnels should be a top priority for growers, but we know that’s not always possible. Our assortment of ToLCNDV-resistant varieties gives growers another layer of protection against this damaging disease."

- Peter Szungyi, Regional Portfolio Manager for Squash 

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