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Abstract In experiments at Makurdi, Nigeria, to quantify the damage to cowpea by different densities of the legume pod borer (LPB), Maruca testulalis cypermethrin 10 EC was sprayed at 0.2 kg/ha a.i. to control larvae when its infestation in flowers reached 10, 20, 30, 40 and 50% in 1985 and 10, 20 and 30% in 1986. Larval damage to the flowers and pods increased with the percentage infestation and reduced the yield to 72.1% in 1985 and 48.1% in 1986. A provisional action threshold of 40% larval infestation in flowers was established, based on the increased damage caused by this level of infestation in flowers and pods and the reduction in yield compared with a > 10% pre‐spray infestation. Keywords: Legume pod borerdamageeconomic thresholdcowpea
E. O. Ogunwolu (Mon,) studied this question.