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Do your rhododendrons, cherry laurel or bay laurel have bay-like damage to the leaves? The culprit is probably the black vine weevil, a black beetle about 0.8 cm in size that is only active at night. You can really get the problem under control if you fight the much more dangerous 1 cm large and yellowish/white larvae. These larvae live in the soil and often eat away at the roots, which can cause plants in particular to die. The larvae can be fought biologically with threadworms, so-called nematodes, which you must apply when watering at the end of April/beginning of May. The treatment should be repeated at the end of August/beginning of September of the same year. You can order the nematodes at the advice desk in the garden center or from the gardener. BlüBa director and garden expert Volker Kugel shows how to fight the culprit biologically. You can also find more gardening tips from the Blooming Baroque at http://www.grünzeug.tv