STUDIES ON THE BIONOMICS AND CONTROL OF THE BURSATE NEMATODES OF HORSES AND SHEEP: IV. ON THE LETHAL EFFECTS OF SOME NITROGENOUS FERTILIZERS ON THE FREE-LIVING STAGES OF SCLEROSTOMES

Abstract

The effect of ten of the commoner nitrogenous fertilizers on the free-living stages of Sclerostomes, is discussed. Urea is the most lethal. Under the conditions of the experiments, which are otherwise ideal for the survival of the larvae, one part of urea to 125 parts of fresh horse feces is necessary to sterilize them. The proportions of the others tested are: Calurea, 1:80; powdered cyanamide, 1:50, with granular cyanamide slightly lower; potassium nitrate, sodium nitrate and Calnitro, 1:20; calcium nitrate and diammonium phosphate (dry or in medium strength solution) 1:17; Nitro-chalk, about 1:16 (but should not be used in strong solution); ammonium sulphate, 1:14.