Relab den Haan

Pathogen Detection and Analytical Services for Cut Flowers Growing



Cut flowers can be divided in crops grown on artificial substrate and crops grown in soil. The fertilization and diseases are almost the same but also differ on several points. For both groups the aim is to get a strong stem, a good color and healthy leaves. To achieve these aims we can support you with our advice. Below you will find some points and examples to improve the cultivation.


Starting material

Especially for multi-annual flowers it is important to start with healthy material. The starting material must be of good quality. Relab den Haan can analyze the starting material to see if it is healthy.

New planting of rose and Gerbera

Especially in young plants it appears that Phytophthora can cause more growth reduction then is expected. A poor growing crop appears after diagnosis often to be infected with Phytophthora. After applying a treatment against this fungus the crop can recover. The fungi can easily be discovered by analyzing the drain water with the DNA-Previscan.

Nematodes in crops grown in soil

Nematodes are still a big problem. A regular treatment is necessary. Therefore it is good to know if there are nematodes present and in which quantity. 


The propagation of roses is located for a part in foreign countries. In some of these countries there is a high infection rate of Agrobacterium. The chance that the propagation material is infected with this bacterium is present. If you doubt the material you can analyze it on the present of Agrobacterium.

Leaf color and leaf margins

For a good leaf color it is important that the roots are active and healthy. The roots take up magnesium and iron which are important for the leaf color. Calcium is also taken up through the root tips and is transported passively. When the climate is not active calcium will not be transported to the leaf margins or flower buds. This can result in necrotic leaf margins.
When the growth changes from a vegetative to a generative growth stage it is possible that the crop needs less nitrogen. In all these cases we would like to help you to come to an optimal fertilization.


Samples are being analyzed to determine if growth circumstances are suitable for optimal growth. Circumstances have to be optimal to prevent growth inhibition, especially when drain water is being recirculated. You can read an interview with a consultant about recirculation and sodium in the root environment when you follow the under mentioned link.

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