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Rijk Zwaan's Pb (Plasmodiophora brassicae) Defense cauliflower varieties have high resistance against the troublesome clubroot disease, offering effective protection without compromising yield or quality. Positioned under the Defense label, Pb Defense provides a robust solution for cauliflower growers globally.

Harvest the benefits of Pb Defense

Healthier crop

Leading to a better soil quality

Higher yields

With more predictable cycles

Harvest uniformity

And high quality curds


Greater peace of mind
throughout the crop cycle

As clubroot becomes a growing concern in cauliflowers worldwide, choosing Pb-resistant varieties not only cuts down on the need for crop protection but also ensures a healthier and more productive crop. With Pb Defense, cauliflower growers can enjoy greater peace of mind throughout the entire crop cycle.

Everything about our Pb Defense

Protection against clubroot in cauliflower

Rijk Zwaan’s Pb Defense cauliflower varieties have natural resistance against infection with clubroot, a disease that can be a serious problem for cauliflower growers worldwide. This protection restricts the growth and development of clubroot effectively, without resulting in any loss of yield or quality for cauliflower growers. Pb Defense is part of Rijk Zwaan’s Defense label.

Clubroot in susceptible cauliflower varieties

Signs of an infection with clubroot in cauliflower tend to appear as the plant gets older. Symptoms include wilting or yellowing due to the formation of characteristic galls which reduce the water and nutrient uptake in the roots. As these clubs or spindles on the roots continue to grow, they hinder the plant’s development. Clubroot thrives in high temperatures and wet conditions. It is extremely difficult to control and can cause significant damage to cauliflower production since most of the infected plants will eventually die.

Minimising the risk of spread

Although Rijk Zwaan’s Pb Defense varieties are resistant against clubroot, there is no guarantee of 100% protection. Therefore it is still essential to work with well-balanced crop rotation, strive for a neutral PH level, maintain good air movement and water flow in the soil, and tackle cruciferous weeds.


Why growers choose
for Pb Defense

The clubroot pressure is increasing in cauliflower on almost all continents worldwide, albeit to a different extent in different regions. Growers who choose cauliflower varieties with Pb resistance can reduce their use of crop protection agents. Since the crop is also healthier and more productive, Pb Defense gives cauliflower growers greater peace of mind throughout the entire crop cycle.
For more information please contact us!
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For more information please contact us!
Rijk Zwaan Australia