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Rijk Zwaan's Delhi Defense Squash varieties have intermediate resistance (IR) against the Tomato Leaf Curl New Delhi Virus (ToLCNDV or New Delhi virus), a troublesome issue for growers especially  in the Mediterranean region. These resistant varieties provide an effective solution for growers, ensuring a reliable and resilient crop.

Harvest the benefits of Delhi Defense

Predictable production

Stable supply for your chain partners.

Higher quality fruits

With better product on the shelves.

Less crop protection needed

for a better return on investment.


Greater peace of mind throughout the crop cycle

Choosing Delhi Defense Squash varieties not only shields your business from ToLCNDV but also ensures a smoother supply chain for your partners.

Protection against the ToLCNDV virus

Rijk Zwaan’s Delhi Defense Squash varieties protect against infection with the tomato leaf curl New Delhi virus (ToLCNDV or New Delhi virus). This virus creates lots of production problems for growers, especially in the Mediterranean region. Resistant varieties offer them a solution. Delhi Defense is part of Rijk Zwaan’s Defense label.

Why growers choose Delhi Defense

The New Delhi virus can cause considerable damage to courgette crops because it leads to severe leaf curl and stunted growth. Besides that, it completely stops the plant’s development. Delhi Defense Squash varieties have a strong resistance against this virus, resulting in stable production and higher-quality fruits. Growers need to use fewer crop protection agents, which leads to better working conditions, more sustainable production and interesting sales opportunities. Delhi Defense gives growers greater peace of mind throughout the crop cycle.

ToLCNDV virus in susceptible squash varieties

An infection with the New Delhi virus becomes apparent very suddenly, after which it is often impossible to save the plants. The whitefly Bemisia tabaci is the most important vector of the virus. Since ToLCNDV thrives in hot and humid conditions, it is most prevalent in the summer and autumn.

This plant virus can affect the leaves and fruits at any stage of production, resulting in small, misshapen fruits and ultimately in a lower yield. The New Delhi virus can cause significant damage to squash crops, since most of the affected plants die.

Minimising the risk of spread

Although the Delhi Defense Squash varieties are resistant, they are not 100% protected. In order to minimise the risk of spread, growers are advised to choose a Delhi Defense variety, keep the whitefly population down and closely monitor the development of symptoms in other host plants.


Trials prove the performance of Delhi Defense

Results from trials show a clear difference between a susceptible variety and a Delhi Defense variety. The resistant plants look healthy, remain symptom-free and continue to produce high-quality fruits.
 For questions please contact:
Joost van Veen
 For questions please contact:
Joost van Veen
Specialist Marketing Open Field Crops