Oogenesis of cereal leaf beetles Oulema ssp. on winter wheat
1997
Sedivy, J. (Vyzkumny Ustav Rostlinne Vyroby, Prague-Ruzyne (Czech Republic))
Two species of cereal leaf beetles Oulema melanopus and O. gallaeciana are harmful agents in wheat in the Czech Republic. The species O. duftschmidi was not found to be present in winter wheat. The abundance of O. melanopus was higher in all years of observation than the occurrence of O. gallaeciana. The ratio of O. melanopus incidence in the population was 69-94.5%. The sex ratio was mostly in favour of the males in the years of observation (1:1.1-1.9). Oogenesis was evaluated by the rate of ovum differentiation in the ovarioles. Maximum of mature eggs in the female ovarioles preceded by 2-4 days the peak of oviposition on plants. Temperature and rainfalls before flights and after them regulated the period of mature egg in the female ovarioles.
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