The study was aimed at selecting species and strains of entomopathogenic nematodes to be used in practical control of the housefly in stables, which should provide welfare of bred animals. Test insect, the housefly, and entomopathogenic nematodes of the family Steinernematidae and Heterorhabditidae were used in experiments. Laboratory strains of nematodes and those commercially available in Poland and in Europe were used in performed tests. Larvae, pupae and imagines of M. domestica were cultivated in the Institute of Organic Industry in Warsaw. Four groups were created for each nematode species. Not all nematode species and strains were equally pathogenic to houseflies.
A series of 17 new derivatives of 2-(2,4,5-trichlorphenoxy)propionate acid was synthetized and tested on pesticide activity. All compounds showed high activity against dicots at 5 kg a.s./ha. Eight compounds were tested in the II stage screening-test. The compounds had a good herbicidal efficacy only at higher dose (2.5 kg a.s./ha), when the dose decreased to 1,25 kg a.s./ha activity was strongly reduced.