[The effect of thiazon on helminth eggs in soil].

Thiazon at the dosage of 200 g/m2 produces a total ovicidal effect on the eggs of Ascaris and Trichurus, laid on soil surface at 12-30-days exposition; at the depth of 5 cm the number of Ascaris eggs reduced by 40-85% and those of Trichurus--by 29-81%, whereas in the intact soil 100% eggs' viability preserved. The thiazon dosage rise up to 250 g/m2 increased also the efficacy of the treatment.