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The objective of this work was testing 4 volatile oils obtained from new varieties of medicinal plants (yellow basil; red basil; marigold; hyssop), over Beauveria brongniartii (BbgMm1a/09) entomopathogenic fungi and Sitophilus granarius, deposit insect. The results obtained showed that at different concentrations, red basil volatile oil showed the strongest inhibitory effect compared to the other tested oils (yellow basil, marigold and hyssop). Concerning the insecticidal action, the preliminary tests with the 4 volatile oils obtained from new varieties of medicinal plants had no effect on the test insect - Sitophilus granarius.

From 2010 to 2013 tests were conducted with entomopathogenic bioproduct based on Beauveria brongniartii, in nurseries of the Botosani, Neamt and Suceava Forest Departments. At RDPP Bucharest a technology for multiplication on nutrtive solid substrate of entomopathogenic fungus B. brongniartii was developed, on the basis of which the experimental bioinsecticide BioMelCon (G) was obtained. Soil treatments were performed with the BioMelCon (G) in doses ranging from 100 to200 kg/ha. The tested dosages were achieved by applying two treatments per year. Application of biological product held generally early spring on surfaces free from crops, to ensure a uniform distribution and to create the possibility of periodic inspection of the treatment effect by soil surveys. Checking the effectiveness of treatment was carried out in several stages, in different site conditions. The paper presents results concerning the effect of applying several biological treatments on Melolontha melolontha larvae (L2-L3). The cumulative effect of the biological product and the agricultural practices of experimental fields have led to a decreased density of larval populations under economic threshold level.

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