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tank. When many trees are to be sprayed a power sprayer should beused in order to secure a pressure which will enable the forcing of a finespray to all parts of the tallest trees. For spraying tall trees anapparatus which works up a pressure of two hundred pounds is requiredso that the spray mixture may leave the nozzle in a solid stream andbreak into a mist as it nears the top of the tree. This is not requiredfor spraying smaller trees or bushes or flowers where the requirementbecomes that of producing a fine spray a few feet from the nozzle. Spray chemicals which are to be used in dust form are appliedby means of so-called "powder guns" when large amounts are used onlarge trees. These are seldom useful on ornamental plants becauseof the usual proximity of houses or public streets and the consequentannoyance caused by clouds of obnoxious dust flying in the air. Manytimes, however, sulphur dust or hellebore can be applied by means ofsmall hand force pumps adapted to using the dry dust, or this dust canbe applied by sifting over the plants through holes punched in the con-tainer in which it is purchased. |
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