RESEARCH ON THE POSSIBILITY OF USING SEMIOCHEMICAL PRODUCTS IN MONITORING THE SPECIES MELIGETHES (BRASSICOGETHES) AENEUS F.

Abstract

In the autumn rapeseed crop, one of the great damage is caused by the rape beetle, Meligethes (Brassicogethes) aeneus F. The widespread use of the chemical method of control has led to the emergence of resistance to some insects. This paper presents the results obtained regarding the possibility of using semi-chemical products in monitoring this species and possibly in control it. During the three experimental years, the attractiveness of three substances was verified: allyl isothiocyanate, nonane and 2-phenyl-ethyl isothiocyanate. With these substances were formulated three types of dispensers that were placed on two types of traps: sticky yellow panels and white Delta type traps. All variants with dispensers made a higher number of catches compared to the control, the differences being statistically assured. In the period 2016-2018, out of the total catches, the control variant achieved 11.3%;dispenser 1 (allyl isothiocyanate + nonane) achieved 23.6%;dispenser 2 (2-phenyl-ethyl isothiocyanate + nonan) made 27.6%, and dispenser 3 (allyl isothiocyanate + 2-phenyl-ethyl isothiocyanate + nonan) made 37.5% of the total catches. The allyl isothiocyanate and 2-phenyl-ethyl isothiocyanate components used together have a synergistic effect so that between the catches made by dispenser 3 and dispenser 1 and dispenser 2, the differences are statistically assured.