| Show I 1 lor I 1 1 q PLAN TO KILL WOOLLY APHIS carbon disulphide solution applied to roots of trees will control tile the pest prepared by tho the united states department ment of 0 agriculture carbon in solution at the rate of one halt half ounce to four gallons of water and applied fit at the rate of three fourths fourtha gallon a square foot of soil will control the root form of the he woolly apple aphis and without injury to the trees under suitable conditions the solution Is prepared by pouring the carbon into the water find and agitating the mixture vigorously when applied on the soil around a tree the liquid penetrates into the ground and tile the poison gas given off by the chemical kills hills the pest every square foot of infested soil should bo be subjected to the action of the solution in order to insure complete control this may be accomplished by pouring the liquid in a shallow basin made in the soli soil around the tree in orchard practice where many trees are to be treated the solution Is best applied by using a power spray ing in outfit and two aux auxiliary illary tanks the advantages of this method are the even diffusion of the he liquid and complete aphid mortality in the soil area treated ana the safety with which the disulphide can be used the disadvantages of tho the method are the hugo huge 0 I 1 il k 4 bmw P Z N power spraying outfit amounts of water required with consequent high cost of labor the difficulty on any but level ground of preparing basins with level floors thus insuring tile proper distribution of liquid over oven the area to be treated and the wide area of infested roots on older trees every square foot of which 11 must be treated with nith the liquid this last condition precludes the use of carbon disulphide except on small trees with restricted root areas |
