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The black bean aphid will appear on beans and other garden plants such as herbs, tomatoes or cucumbers from May. It sucks on the leaves and also often transmits viral diseases. The lice hibernate on snowball, Schneebere and Pfaffenhütchen.
Grow beans in mixed culture with savory. Nasturtium attracts black lice magically and can be used specifically as a catch plant. On buffalo beans, which are already laid out at the end of February or preferred in the cold frame and are planted in March, the lice are hardly ever. With fernwort or sorghum-sparing means such as pest-free sprinkle natures and promote the natural enemies (lacewings, ladybirds and others).