Abstract
Naled, a low toxic organophosphorus acaricide, was investigated for efficacy against Sarcoptes scabiei var. suis in vitro. Mites of this variety were obtained from cutaneous lesions of naturally infected piglets by incubating at about 37°Cfor 1 hour. Petri dishes with cross stripes on the outside of the bottom were used for the test. One milliliter of the drug solution at a given concentration, which had been prepared by dilution with acetone, was poured into each dish and dried at room temperature. Then 30 mites were put in each dish to calculate the knock down ratio (KT ratio) with the lapse of time.
As a result, this testing procedure was found to be a useful means for the examination of scabicidal effect of drugs. Naled was suggested to have a relatively rapid killing activity on this species of mites. The present study was carried out on adults, nymphs, and larvae of mites, since it was difficult to use mites of the same developmental stage because of the limited number of mites obtained.
