Weed suppression ability of ''egusi'' melon (Citrullus lantus Thunbers) and yield of white guinea yam (Dioscorea rotundata Poir cv. Suba) under individual, trellis, pyramid, and non-staking methods were evaluated with or without intercropping with melon. Yam intercropped with melon significantly (P < 0.05) reduced weed growth by about 50% compared with monocropped yam in both years of study, irrespective of the staking method. The individual staking method resulted in a significantly higher (P < 0.05) weed infestation than other treatments with or without intercropping in 1989, whereas in 1990 the level of weed growth in intercropped pyramidally staked yam was significantly greater (P < 0.05) than that of the trellis-staking method. Pyramidal staking in 1989 resulted in a significantly lower (P < 0.05) yam yield than all other treatments in non-intercropped plots; however, yield from intercropped individual and trellis treatments were both significantly greater (P < 0.05) than those not staked. Staking methods and intercropping in 1990 did not significantly affect yield.
