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The periodicity of pheromone release and male responsiveness in the artichoke plume moth, Platyptilia carduidactyla

ABSTRACT. The periodicity of calling by female Platyptilia carduidactyla (Riley) is influenced by temperature and photoperiod. Both diurnal and nocturnal temperature changes shift the period of nocturnal calling, but in fundamentally different ways; lower daytime temperatures delay activity, while lower night temperatures result in earlier activity. Lengthening photoperiods result in activity earlier in the scotophase, but the period of activity does not maintain a constant phase relationship with either lights‐on or lights‐off. The periodicity of the behavioural response of males parallels that of calling by females, resulting in coordination of reproductive activities in the field. The result of these responses to environmental stimuli is that mating activity can occur throughout the year in coastal California.