§ Mr. McENTEEasked the Secretary of State for the Colonies whether any experiments by spraying from the air for the destruction of locusts or malarial mosquitoes have been carried out in any area controlled by his Department; and, if so, were the experiments considered to be successful?
Mr. M. MacDONALDCertain experiments against locusts were carried out last year by the Government of Northern Rhodesia. These showed that it is possible to destroy locusts in flights by spraying them with finely divided poison dust from aircraft. The report on these investigations was considered by the Third International Locust Conference, held in London in September last, which recommended that further work should be carried out with a view to developing these methods of locust control. I am not aware of any experiments in the destruction of malarial mosquitoes by similar methods in any of the Dependencies.