FLIGHT ACTIVITY OF WINTER RAPE PESTS

The paper presents the results of a 5-year research on Ceutorhynchus n api, C. pallidactylus, C. assimilis ana Meligethes aeneus, pests of wi nter rape. The population dynamics, flight activity, changes in sex ra tio, and oogenesis of these pests were studied using yellow water-trap s. 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, the re was a considerable difference between the development of ova in the ovarioles of females captured in the water-traps and those found on r ape plants. The use of the SETF and yellow water-traps in practical pe st control is discussed.