Orientation behaviour of earthworms (Lumbricidae) towards different crops

Summary In an outdoor experiment the distribution of earthworms (Lumbricus spp., Allolobophora spp.) under different plant species was studied. Earthworms avoid uncovered areas, but show different reactions under vegetation. This effect reappears in the same manner every year. A particular preference was shown for clover whereas onion was least preferred. Possible reasons for this behaviour are the extent of covering, the moisture regime and exudates of the plants. According to the results obtained the deciding factor seems to be the extent of cover whereas odorous substances are of secondary importance.Dedicated to the late Prof. Dr. M.S. Ghilarov