ON THE REGENERATION OF ROOT FRAGMENTS OF LEAFY SPURGE (EUPHORBIA ESULA L.)

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Abstract
Summary. The roots of leafy spurge (Euphorbia esula L.) normally produce shoot buds abundantly near the soil surface but with decreasing frequency at increasing depths. By placing Fragments of roots collected from various depths in the soil in shallow flats in a glasshouse, it was demonstrated that root Fragments from all depths down to 2–8 m do not differ appreciably in rcgenerative capacity and this capacity is not dependent upon the presence of performed shoot buds. By collecting root fragments from the same stand throughout the growing season it was shown that regenerative capacity is lowest in June at the time of maximum flowering. The implications of these findings arc discussed in relation to the control of this species. Sur la régénération des fragments de racines de Euphorbia esula L.