Effect of temperatura on reproductive attributes of the Mexican beetle Zygogramma bicolorata (Coleoptera: Chrysomelidae)
The effect of different constant temperaturas on several reproductive attributes of the Mexican beetle, Zygogramma bicolorata Pallister, was studied. Fecundity and egg viability, pre- and post-oviposition period, and age-specific fecundity were assessed at 20, 25, 27, 30 and 35 °C. Maximum fecundity and per cent egg viability were recorded at 27 °C (928 eggs and 75.6%, respectively). Pre-oviposition and post-oviposition period declined with increasing temperature up to 27°C, then increased at temperatures beyond that. Oviposition period decreased from 92.9 to 27.5 days with temperature increment. Age-specific fecundity was also temperature dependent. Z. bicolorata is a biological control agent of the parthenium weed Parthenium hysterophorus Linnaeus, and these findings may be useful in mass rearing programmes for the natural enemy.
Key wordsZygogramma bicolorata Parthenium hysterophorus temperature age-specific fecundity egg viability biological control
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