On the effects of diet and photoperiod on <Emphasis Type="Italic">Harmonia axyridis</Emphasis> (Pallas) (Coleoptera,Coccinellidae) larval development |
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Authors: | S Ya Reznik |
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Institution: | 1.Zoological Institute,Russian Academy of Sciences,St. Petersburg,Russia |
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Abstract: | It is known that the light day length and diet could act as cue factors inducing adult (reproductive) diapause in aphidophagous
coccinellids. However, the rate of coccinellid larval development could also depend on photoperiod and diet. The present study
examines the effects of photoperiod (L: D = 12: 12 or 16: 8) and diet (the green peach aphid Myzus persicae or eggs of the Angoumois grain moth Sitotroga cerealella) on preimaginal development of the multicolored Asian lady beetle Harmonia axyridis. At 20°C, a short light day and feeding on aphids shortened larval development by 1.4 and 4.6 days, respectively. In combination,
both factors caused a simple sum of separate impacts indicating the absence of their interaction. The duration of the pupal
stage was independent of photoperiod, but decreased by 0.3 days in individuals fed on aphids. The proportion of the larvae
that successfully completed preimaginal development was also independent of the light day length, but significantly depended
on diet (84 and 60% in individuals fed on green peach aphids and on grain moth eggs, respectively). In sum, these results
suggest that in the case studied, diet does not play the role of cue factor, but directly influences the larval growth and
development of H. axyridis. |
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