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Diurnal patterns of mortality in aphids infected by entomophthoran fungi

Periodicity of aphid death has been studied for six fungus/aphid combinations at 15° and 16:8 light/dark cycle. In all cases diurnal patterns were found, with most deaths occurring in the light. This response was found to be due to photoperiod. Differences in timing were found which were due to the species of fungus involved. Entomophthora planchoniana and Erynia neoaphidis caused all deaths to occur within a 4‐h period, peak mortality being 8–9 h and at 14 h post‐dawn respectively. Zoophthora radicans caused some deaths throughout the 24‐h cycle but also provided sharp peaks of mortality at 12 h post‐dawn. Poorer synchronisation of deaths was found in Erynia kondoiensis, Conidiobolus obscurus and Zoophthora phalloides, but broad peaks did occur towards the end of the photophase. The ecological implications are discussed.