Application of Larvacide (Mosquito Oil) by Use of Knapsack Sprayer
Miraflores, Canal Zone, June, 1910
Description: 11x 8 inches
Black and white photograph
One way of controlling the spread of malaria and yellow fever during the construction of the Panama Canal was the application of larvacide (carbolic acid, resin and caustic soda) in grassy areas to eliminate mosquito larvae. The application of larvacide was critical to Roosevelt’s efforts to complete the Canal by 1914.