Skutecznosc wybranych insektycydow przeciw smietce modrzewiowce Strobilomyia laricicola [Karl] [Diptera: Anthomyiidae] i innym owadom na plantacji nasiennej modrzewia europejskiego Larix decidua Mill.

Results of studies on the efficacy of selected insecticides against Strobilomyia lariciola (Karl) in seed orchard of Larix decidua Mill. in the Brzeziny Forest District (Forest Region of Łódź) during 2001-2002 are presented. Chemical treatments were carried out using the ground spraying equipment, and the water emulsions of the following preparations were applied; Karate 025 EC 0,3%, Bi-58 Nowy 1%, Owadofos 540 EC 0.15%, Marshal 250 EC 1% and Dimilin 25 WP 0.4%. The effectiveness of treatments was evaluated on the basis of the analysis of the ripening and ripe cones collected in individual sections of seed orchard. From among the tested preparations Karate 025 EC showed the best efficacy. Monitoring of S. laricicola using so called visual traps should be carried out prior to its chemical control.