INTEGRATED PEST MANAGEMENT OFCEUTORHYNCHUSSPECIES (COLEOPTERA: CURCULIONIDAE) IN OILSEED RAPE

In Croatia, oilseed rape is cultivated on about 15 000 ha. Because of the production of biofuels the area of land devoted to rape will rise to as much as 100 000 ha. An increase in the area will lead to an increase in the number and the abundance of pests. The most significant oilseed rape pest isMeligethes aeneusFabricius, 1775 which can reduce yields by up to 50 %. In the spring, however, damage is caused byCeutorhynchus napiGyllenhal, 1837 andCeutorhynchus pallidactylusMarsham, 1802 the larvae of which drill mines in the stalks, the plants in consequence lagging in growth and development. Research into stem mining weevils on oilseed rape has in recent times, as well as with yellow traps, also been conducted with sticky traps. During 2007 the density of stem mining pests in oilseed rape was carried out at three sites in the inland part of Croatia with the use of yellow sticky traps and yellow water traps. On the basis of the size of the population of adult individuals, a detailed survey of oilseed rape plants was carried out, the objective being to ascertain the intensity of the stem-mining weevil infection.