D. Angelova, H. Lambev

Abstract. The survey was conducted during the period 2008 – 2009 at Institute of Roses, Essential and Medicinal Cultures, Kazanlak. The experiment is set in the plantation of lavender variety Hebar. The efficacy and selectivity of the herbicide Raft 400 SC is studied in doses of 1 l/ha and 1,2 l/ha. It was found that oxadiargyl administered at dose 1,2 l/ha has a higher level of performance against annual and perennial weeds. The herbicide has excellent selectivity for lavender and has a positive effect on fresh weight yield.