Effectiveness and Selectivity of the Herbicide Diflufenikan in Common Bean

Abstract

During the period from 2006 to 2008 we conducted a number of experiments at the experimental base of the Agricultural University – Plovdiv in order to establish the effectiveness and selectivity of the new herbicide diflufenikan (trade name – Pelikan 50 CK). The prevailing types of weeds in the experimental fields were annual late-spring weeds. The herbicide preparation was selective for common bean Bulgarian cultivar Plovdiv 15 (grade 1 on the scale of EWRS) in doses of 200, 250 and 300 ml/ha. The effect of the herbicide on the annual dicotyledonous weeds was the greatest for the variant Pelikan 50 CK – 300 ml/ha and during the three years of the experiment it reached 90-94% compared to the control K1 and when doses of 200 and 250 ml/ha were applied, the effectiveness reached 82%-84% respectively. In 2007 the effect of the herbicide was the lowest due to the severe drought in April and the high density of the annual gramineous weeds was not affected by application of the herbicide