On the effects of diet and photoperiod on Harmonia axyridis (Pallas) (Coleoptera, Coccinellidae) larval development | О влиянии корма и фотопериода на развитие личинок Harmonia axyridis (Pallas) (Coleoptera, Coccinellidae)
2010
Reznik, S.Ya., Russian Academy of Sciences, St. Petersburg (Russian Federation). Zoological Inst.
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 larvae development could also depend on photoperiod and diet. The present study examines effects of photoperiod (L : D = 12 : 12 or 16 : 8) and diet (eggs of the grain moth Sitotroga cerealella or the green peach aphid Myzus persicae) on preimaginal development of the multicolored Asian lady beetle Harmonia axyridis. At 20 deg C, short light day conditions and feeding on aphids shortened larval development for 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 for 0.3 days in individuals fed on aphids. The proportion of larvae that successfully completed preimaginal development was also independent of the light day length, but significantly depended on the diet (84 and 60 % survival in individuals fed on green peach aphids and on the grain moth eggs, respectively). In sum, these results suggest that in the case studied, diet does not play a role of cue factor, but directly influences H. axyridis larval growth and development
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