Important insecticides : directions for their preparation and use . cannot be successfully carried out, and are particularly advantageous inthe case of deciduous plants with dense foliage which renders a thor- ° See Bui. 46, Bur. Eut., p. 28 ough wetting difficult in summer, or with scale insects which are soirregular in the time of disclosing their young that many summertreatments would be necessary to secure anywhere near complete ex-termination. In the winter also, with deciduous trees, very much lessliquid is required, and the spraying may be much more expeditiouslyand thoroughly do
Important insecticides : directions for their preparation and use . cannot be successfully carried out, and are particularly advantageous inthe case of deciduous plants with dense foliage which renders a thor- ° See Bui. 46, Bur. Eut., p. 28 ough wetting difficult in summer, or with scale insects which are soirregular in the time of disclosing their young that many summertreatments would be necessary to secure anywhere near complete ex-termination. In the winter also, with deciduous trees, very much lessliquid is required, and the spraying may be much more expeditiouslyand thoroughly done. In the case of badly infested trees, a vigorouspruning is advisable as a preliminary to treatment. DUSTING AND SPRAYING APPARATUS. POWDER DISTRIBUTEBS. For the application of powders the dusting bags already described(pp. 11-12) are very satisfactory for field work. Much more expen-sive and more rapidmachine distributershave been devised, butthese are rarely garden worksome of the smallpowder bellows andblowers are cost from $2to $ LIQUID SPBAYEES. For the applicationof poisons in liquidform the prime essen-tial is an apparatuswhich will break upthe liquid into a finemist-like spray thatwill coat every leafand every other partof the plant as lightly as is compatible with thoroughness. Theessential features of such an apparatus are the force pump, suitablehose, and nozzles or spray tips. The leading pump manufacturersnow put out a large variety of spraying apparatus suited for allordinary needs, including the small knapsack pumps, barrel and tankpumps, and geared and power sprayers. For limited indoor opera-tions a hand atomizer or even a sprinkling can with fine rose tipmay be made to do fair service. 127 Fig. 3.—Barrel spray pump. (From Waite.) 29 The barrel pump.—This is the commonest form of spraying appara-tus, and is supplied in many different styles; or, a suitable spraypump can be combined with an empty 50-gallon kerosene barrel with-
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