The investigated samples of Ol. Melissae characterize with different chemical composition. Citronellal, geraniol, citronellol, citral and ß-caryophyllene appeared to be predominant components of this essenital oil. The activity of Ol. Melissae on microorganisms pathogenic for men was moderate, whereas its components revealed synergetic antimicrobial effect.
Insecticides most often inhibit the development of fungal diseases, but can also stimulate them. The mechanisms of these phenomena are discussed and examples are given. The protective effect may be the result of direct pesticide influence on the pathogen, host susceptibility or other biocenotical components. The important factor is pest control which limits the infection of plants through the wounds caused by insects. Knowledge of side effect of insecticides on plant diseases may have important role during the application of pesticide mixtures and enable its usage in integrated plant disease control.
Studies were the effect of 2,4,6-trihydroxybenzenocarboditioic acid (TBCD) on unpurified enzymatic extract of aconitate hydratase from Aspergillus niger fungi. The inhibition of aconitate hydratase functions, by means of estimation of regulation extent of equilibrium isomerization reactions of citrates under influence of TBCD, was found.