Two kinds of experiments were made to examine the effect of chemosterilants on house flies :(1) A preliminary experiment, (2) A field experiment.
The baits containing 64% sugar, 20% skim milk, 15% honey and 1% chemosterilant, MAPO or HEMPA, were applied to control house flies(Musca domestica LINNE)at the comparatively isolated places : Mt. Sambe, Honjo of Matsue, and Naka-no-shma in Oki Islands.
(1) A preliminary experiment was made in Honjo Farm. The females that had taken a bait there deposited no eggs.
(2) In a field experiment, the chemosterilant baits were renewed every five days(MAPO) each week(HEMPA) for 35 consecutive days.
In Oki Island, MAPO reduced the number of adults from 7.6 to 4.3 per fly-ribbon within two weeks, and HEMPA from 7.1 to 3.6 within three weeks.
As Sambe and Honjo were not so well isolated as Oki Islands, the results were not so good.