Evaluation of the efficacy of selected herbicides on common weeds.

Abstract

Weeds are certainly as old as agriculture, and from the beginning, farmers recognized the presence from those unsown species interfered with growth of crops that they intend to produce. Weeds have enormous impact in crops fields such as competing with crop for light, water, nutrients, and even harbour pest and diseases example in family of Fabacaeae weeds host P.meibomiae and Phakopsora pachihizi that causes soybean rusts others include Desmodium tortuosum. These weeds have been effectively controlled using herbicides. However there are cases of resistance that have been recorded in the past few periods. Therefore in this study we evaluate the efficacy of some selected fungicides on common weeds in central Uganda under field conditions. This experiment was carried out in Makerere University Agricultural research institute Kabanyolo. The products that were tested include Glyphosate 75% (Gyphosine), Glyphosate 50% (Weedgran) compared with Glyphosate 50 % (Weed master). There were 3 treatment levels that were used i.e. 50% less, 50% more of the recommended rate and the comparison product was applied at the recommended rate. These treatments were recommended three times each includes the control. Gyphosine and Weedgran were the most effective at recommended rate and 50% more recommended rates. The 50% less of the both products were the least effective. All in all the treated plots were significantly different from the untreated ones.