Flight activity of winter rape pests.
1994
Sedivy J. | Kocourek F.
The paper presents the results of a 5-year research on Ceutorhynchus napi, Ceutorhynchus pallidactylus, Ceutorhynchus assimilis and Meligethes aeneus, pests of winter rape. The population dynamics, flight activity, changes in sex ratio, and oogenesis of these pests were studied using yellow water-traps. The sums of effective temperatures for flight activity (SETF) were determined. The sex ratio of the above species showed distinct changes, the percentage of females being higher than that of males. Also, there was a considerable difference between the development of ova in the ovarioles of females captured in the water-traps and those found on rape plants. The use of SETF and yellow water-traps in practical pest control is discussed.
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