Abstract
As a substitute for the digging-out process, fumigation with carbon disulphide proved very successfu1. Against the tree, with the open side over the borer holes, a cell with open top, resembling a large mud wasp's nest, is built of plastic clay or mud. A teaspoonful of carbon disulphid is poured in and the cell closed with a plug of clay. The surface of the cell is then wetted and smoothed down, and carefully sealed to the tree and the earth. This method gives 100% control when properly done, requires less time than the digging-out process, and neither mutilates nor injures the tree.
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