997 resultados para Morghen, Raffaello, 1761-1833


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1833-1834

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3rd ser. : v.3 (1833 : July-Dec.)

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v.15 (1833)

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v.16 (1833-1834)

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[v.14] (1832-1833)

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3rd ser. : v.2 (1833 : Jan.-June)

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1832-1833

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1833-1834

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1st Session (1833)

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Oviposition of Zabrotes subfasciatus (Boheman, 1833) on Phaseolus vulgaris (Linnaeus, 1753) was studied immediately after emergence of the adults throughout the females life and in situations of host deprivation lasting for 1 to 10 days. The number of eggs laid daily, longevity, duration of oviposition and distribution of eggs per grain were studied. The number of eggs laid per day varied significantly, with the oviposition peak in the presence of the host (control group) occurring between day 2 and day 5 of oviposition. In the absence of the host, a shift in the oviposition peak to the first day after deprivation was observed, except for the group deprived for one day which showed a peak between days 1 and 4 after introduction of the host. The distribution of the eggs per grain in the control group and in the groups deprived of the host for 2, 5, 8 and 10 days, a larger egg aggregation was observed for all deprived groups compared to the control group.