Xylosandrus germanus (Blandford, 1894) is an invasive ambrosia beetle species that has already spread in most of Romania's territory and represents a potential pest for forestry, fruit growing, and viticulture. The objective of the research presented in the paper was to identify some pesticides usable in the EU and accepted by the Forest Stewardship Council, which could prevent attacks caused by this species. We tested four insecticides in a laboratory experiment organized in a completely randomized block with five variants and eight replicates. These were: BactoSpeine DF (54% Bacillus thuringiensis subsp. kurstaki), Mospilan 20 SG (20% acetamiprid), Konflic (50% Quassia amara extract + 50% potassium salts of fatty acids), and Laser 240 SC (240 g/l spinosad). We studied pest mortality, attack intensity, and sublethal effects (on fecundity and offspring development) of the tested products on insects. All pesticides had a concentration of 1% (except the first one, which had 10%). We applied them on the surface of thin segments of beech stems (ST) by ST immersion in the prepared solutions for two minutes and then aired for an hour. Before the treatment, STs were kept for 24 h in an aqueous solution of ethanol (48%) to be attractive to insects. Each ST was placed in a transparent jar with 20 X. germanus females collected on the same day from the field. The experiment took place over 32 days, during which the average temperature in the test site was 24.1°C, relative humidity 81.6%, and maximum light of 250 lux, 15:9 (L:D) h. Cumulative insect mortality was between 10.6% (in control) and 61.9% (in spinosad), significant differences being recorded only between acetamiprid and spinosad, on the one hand, and the other variants, on the other hand. Attack intensity ranged from 8.0 ± 1.9 galleries/ST (mean ± standard deviation) (in spinosad) to 18.7 ± 1.1 galleries/ST (in control), and significant differences were recorded still only between acetamiprid and spinosad on the one hand, and the other variants, on the other hand. Because some females died or left the galleries after entering the wood, the number of females with offspring per ST (FDST) was slightly lower than the intensity of the infestation. Under all three aspects (mortality, reduction of infestation intensity, and reduction of FDST), the most effective was spinosad (57.4%, 57.2%, and 66.7%, respectively), followed by acetamiprid (46.6%, 53.5%, 60.5%), the other two products having efficacies below 10-20%. The mean number of offspring/ST ranged between 165.1 ± 105.6 (acetamiprid) and 265.0 ± 84.5 (control), but differences between variants were not statistically significant at p = 0.05. The fecundity of females that survived the pesticide interaction ranged from 13.1 ± 6.5 offspring/female (Konflic) to 23.9 ± 11.3 offspring/female (spinosad). None of the pesticides caused a reduction in fecundity, and spinosad even caused a significant increase. Of the offspring produced by females, 61% reached adulthood by the end of the experiment. However, acetamiprid or spinosad seemingly delayed their development. The adult proportions in the total offspring in these variants significantly differ from that in the control variant. The results indicate that - in the concentrations used - only two products (Mospilan 20 SG and Laser 240 SC) were sufficiently effective to be considered in future field trials. Further investigations are necessary on possible sublethal effects induced by spinosad and acetamiprid. [ABSTRACT FROM AUTHOR]