§ Lord O'Haganasked Her Majesty's Government:
Whether they will state the scientific evidence on which they have based their decision to refuse to accept treatment with Derris as a method of eradicating Warble Fly.
Earl FerrersThe successful treatment of warble fly necessitates the application of appropriate insecticides to entire herds, who may not exhibit any symptoms of infection. While Derris is effective in the limited circumstances when the larvae are at the skin surface of an individual animal, it cannot deal with deep-seated infection for which a systemic insecticide is necessary.
House adjourned at twenty-six minutes past four o'clock.