Control of Canadian Fleabane (Erigeron canadensis L.) in Seed Production Stands of Lucerne (Medicago sativa L.)

1 Institute of Forage Crops, BG-5800 Pleven, Bulgaria
2 Institute of Plant Protection, BG-2230 Kostinbrod, Bulgaria


DIMITROVA, Ts. and S. MILANOVA, 2003. Control of Canadian fleabane (Erigeron canadensis L.) in seed production stands of lucerne (Medicago sativa L.). Bulg. J. Agric. Sci., 9: 349–352

The study was carried out during the period 2000–2002 in the experimental field of the Institute of Forage Crops – Pleven in order to determine efficient means of controlling Canadian fleabane in lucerne for seed production.
As a result of the study the following more important conclusions were drawn: In the control of Canadian fleabane the treatment with Glufosinate 20 % (Basta 20 SL) at a rate of 600 ml/ha within 3–4 days after the cutting of the primary growth of lucerne resulting in a herbicidal effect of 96–100 % and an increase of seed yield by about 43 % was most expedient; The successful control of Canadian fleabane in the lucerne seed production stands limited the possibility for increase of weed population numbers. The application of the herbicides imazethapyr 10 % (Pivot) and Glyphosate 36 % (Roundup) for controlling Canadian fleabane was not expedient because of lack of an herbicidal effect and because of phytotoxicity to lucerne, respectively.

Key words: Canadian fleabane, herbicides, lucerne, seed