Insecticidal activity of four different substances against larvae and adults of sycamore lace bug (Corythucha ciliata [Say], Heteroptera, Tingidae).

摘要

Results of a study on the insecticidal activity of two known insecticides (deltamethrin and imidacloprid), thujone and essential oil of rosemary against the larvae and adults of sycamore lace bug (Corythucha ciliata) are presented. The experiment was conducted in a laboratory under room conditions. We tested the activity of each product in three different concentrations. Deltamethrin exhibited the most desirable insecticidal activity, as it caused almost 100% mortality of both developmental stages of the pest at all three concentrations. This was followed by imidacloprid, which caused 89.6% larval mortality at recommended concentration, and essential oil of rosemary, which caused 81.7% adult mortality at 1% concentration. Larvae of sycamore lace bug were significantly more susceptible to tested products than adults. The lowest mortality was recorded one day after treatment (41.7%), while the highest mortality was obtained three days after treatment (71.3%). We recommend the application of thujone and essential oil of rosemary, which appeared to be environmentally acceptable substances. In our study, both agents showed a satisfactory activity in controlling larvae and adults, but they have also obvious repellent activity, which leads to their better efficacy in the open.