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The host-specific beetle  Neogalerucella calmariensis  was introduced to North America to control  Lythrum salicaria , and in some areas has persisted in high population densities despite decimation of target plants. We hypothesised that egg predation might contribute to the survival of the beetles. In small-scale laboratory experiments, we investigated the likelihood of egg cannibalism at different  N. calmariensis  life stages. Neither neonates nor adults cannibalised eggs, however late instar larvae readily preyed on eggs of conspecifics. Pupal weights of larvae that cannibalised eggs were larger than those fed only leaf material suggesting that egg cannibalism may be associated with a fitness benefit.

Egg cannibalism by larvae of the weed biological control agent, Neogalerucella calmariensis