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Observations on the biology of Subcoccinella vigintiquattuor‐punctata (L.) in southern England

1 Subcoccinella 24‐punctata (L.) is exclusively phytophagous, and is widely distributed throughout Britain. 2 Under laboratory conditions the duration of pre‐adult instars is about 6 weeks. Adults appear from the end of June onwards. Many enter reproductive diapause at the end of July, but remain active till the end of October. 3 Reproductive diapause is determined by the interaction of photoperiod and temperature. 4 Hibernation is unstable, and there may be high mortality in overwintering adults. These finally die during May and June. 5 The cool temperate climate limits the population size, preventing it from reaching pest proportions.