AN INVASION OF BRITISH GUIANA BY LOCUSTS. 357 



Recently described methods for locust destruction by the use of arsenical com- 

 pounds, such as those employed in the Malay States, appear to be highly successful, 

 but they are carried out under Government control by trained European officers 

 who are employed solely on this work. It is now a definitely established fact 

 that only the most poisonous arsenic compounds are of any use in strong solutions 

 which scorch and destroy all vegetation with which they come in contact. Such 

 a procedure is unnecessary in this Colony. The previously described mechanical 

 methods in conjunction with a judiciously administered Plant Diseases and Pests 

 (Prevention) Ordinance have proved adequate. 



Note. — The cost of this campaign, has recently been calculated ; it was $2,038.60 

 (£424 14s. 2d.). The area affected and dealt with was 250 square miles. See 

 Journal of the Board of Agriculture, British Guiana, xi, no. 2, p. 68. 



