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O. nigeriensis Uvarov is widely distributed in the moist grassland habitats of Nigeria. Although this area is used for intensive agricultural activities, providing more than 90% of the grains needed in the country, the insect has been reported to cause only minor damage to agricultural crops while the closely related O. senegalensis is a serious pest of crops. The reason for the minor pest status of O. nigeriensis is unknown and only adequate study of the insect/host-plant relationship will provide some clues. Nymphs and adults of O. nigeriensis were reared on selected food plants (grasses) in the laboratory, this included Axonopus compressus, Cynodon dactylon, Eleusine indica, Seteria gracilipes, used singly and as a mixture of all four. Development of the nymphs was shortest when rearing was on a mixed diet: 60 d compared to 105 to 127 d for single host plants. Rearing the adults on S. gracilipes promoted faster oocyte development than the other treatments. The present pest status of the insect is discussed based on the data obtained.

The effects of various host plants on nymphal development and egg production in Oedaleus nigeriensis Uvarov (Orthoptera: Acrididae)