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The effects of porina larvae infestation from April to September on monocultures and mixtures of Grasslands Ruanui and Manawa ryegrass, and Huia and 4700 white clover, and on mixtures of Ruanui ryegrass and white clover of high or no cyanogenic glucoside content were examined. No effect of species or of white clover cyanogenic glucoside content on larval survival was shown. Larval weight was related to density of surviving larvae and potential yield of the sward. Larvae reduced yield of white clover monocultures more markedly than of other swards, but susceptibility of white clover was buffered in mixture with ryegrass, Manawa was more susceptible than Ruanui ryegrass to porina infestation, which modified their competitive balance. Effects of larvae on herbage and chemical composition were shown. Measurements of herbage yield reduction caused by porina larvae in glasshouse and field experiments are compared, and management techniques which may minimise the effect of porina damage are discussed.
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Harris et al. (1972) studied this question.
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