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Sudan Journal of Agricultural Research

Chemical weed control in irrigated common bean ( Phaseolus vulgaris L.) in Northern Sudan

Khogali, I.Idris, Elsadig.S.Mohamed and Salah.E.Elamin

Abstract:

Weeds constitute one of the major biotic constraints that limt production of common bean (Phaseolus vulgaris L.) in Sudan. Field studies were conducted during 1998/99 – 2002/03 winter seasons, to determine the magnitude of yield losses due to weed competition and to evaluate the activity and selectivity of the herbicide Stomp alone at 1.2 kg a.i./ha and its tank-mixtures with other herbicides, including Pursuit at 0.025 and 0.05 kg a.i/ha; Gesagard at 0.36 and 0.71 kg a.i/ha and Cadre at 0.025 and 0.05 kg a.i/ha in controlling weeds in common bean. Weeded and unweeded checks were included for comparison. Yield reduction as a result of unrestricted weed growth ranged from 53-74%. The herbicide Stomp alone and its tank-mixtures with Pursuit or Gesagard were tolerated by the common bean and resulted in a significant increase in the final yield of the crop. However, the herbicide mixture of Cadre and Stomp showed slight and negligable phytotoxicity symptoms. All herbicide treatments used were found to be effective against wide spectrum of weeds. However, in season 1999/2000, all herbicide treatments gave moderate to poor control of broad-leaved weeds due to the presence of Rhynchosia memnonia (Del.) DC. which tolerated all herbicides used. The highest grain yield was achieved by Stomp combined with a single supportive hand weeding given at 4 weeks after sowing, or when tank-mixed with Pursuit. The latter treatments gave comparable yield to the hand weeded control.


 

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Sudan Journal of Agricultural Research Vol. 8 (2007) PP. 17-21