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This measure is very important when symptoms such as root rot and stunted growth occur more frequently or carrots form only thin roots.
The cause is usually an infestation with tiny roundworms (nematodes). Pests can be very effectively controlled by the sowing of marigolds (Tagetes).
The plants excrete fragrances via their roots, with which they attract the nematodes. As soon as they penetrate the roots, the summer flowers release a deadly poison.
Helpful are varieties such as 'single gold' (Tagetes patula nana) or mixtures with tagetes, calendula, cockade flower and sun hat (for example, 'soil therapy', 'garden doctor').
Sowing: early August - the plants should remain on the bed for at least 100 days.