Healthy planting material strongly contributes to prevention of, for instance, problems with Phytophthora spp., VerticilliumXanthomonasColletotrichum, virus diseases, tarsonemid mites, aphids or free-living nematodes.

If growers propagate their own planting material, they must test the health status of the material in accordance with regulation (growing and propagation material has to be separated).

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