Control of Euphorbia heterophylla L. in cowpea with herbicides and herbicide mixtures

O.M.kinwa, R.O.; Akinyemiju, O.A.

Crop Protection 9(3): 218-224


ISSN/ISBN: 0261-2194
DOI: 10.1016/0261-2194(90)90166-5
Accession: 001786687

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In a study, aimed at identifying the best time of application and the most effective herbicides and herbicide combination for the control of E. heterophylla, separate screenhouse and field trials were conducted. In both sets of experiments two rates each of alachlor, acifluorfen, cyanazine and a metobromuron plus metolachlor mixture were applied at differents times after planting to control the weed in two cowpea (Vigna unguiculata (L.) Walp) cultivars (Ife-Brown and TVx 3236). In the screenhouse study, results showed that the various herbicides when applied pre-emergence suppressed E. heterophylla more effectively than when applied postemergence. Cyanazine and acifluorfen at both doses and at the various times of application were injurious to cowpea. The metabromuron plus metolachlor mixture was well tolerated by cowpea and suppressed the weed effectively when applied at 2.5 kg ha-1, but its postemergence application was lethal to cowpea. Alachlor at 2.5 and 5.0 kg a.i. ha-1 applied pre- and postemergence was ineffective for the control of E. heterophylla. Results of the field experiment generally confirmed the screenhouse observation. In these series of studies it is reasonably demonstrated that the control of E. heterophylla in cowpea in the field can be achieved by a pre-emergence application of 3 kg a.i. ha-1 of a metobromuron plus metolachlor mixture. However, supplementary weed control might still be required.