EN
Biological control methods are one of the most important elements of the Integrated Pest Management programmes. The paper presents the results of studies on biological control of spider mite (Tetranychus urticae) using the fungus species Fusarium proliferatum F1. The studies were carried out on cucumber and bean plants under laboratory and glasshouse conditions. Foliar treatment was done with water suspension of the fungus spores (at spore concentration 5 × 107/1 ml water), and the product was applied at the dose of 0.1 g/1 l water. The number of hatched nymphs as well as viability and mortality of mobile forms were taken into consideration. The obtained results revealed that one performed treatment did not affect the development of T. urticae eggs both under laboratory and glasshouse conditions. In the glasshouse experiments the mortality of adults and nymphs amounted to 70.7 and 84.2% respectively as compared to the untreated control objects with the percentage mortality value 18.3%.