106 



INJURIOUS INSECTS OF 1904. 



in the field to frequently test one of the Kero-water pumps which 

 we are using (see page 88), in order to post ourselves as to just 

 what strength we were giving the trees. 



DUvST SPRAYERS. 



The simplest form of dust sprayer is found, perhaps, in the little 

 bellows sold at drug stores, and used to distribute pyrethrum in 

 cracks and crevices which might conceal fleas or bedbugs. A larger 

 bellows is made for use with plants, and a still more complete machine 

 for field use is known as the Leggett London Purple Gun, Fig. 115, 

 with which one can distribute lime or a mixture of lime and Paris 

 green, flour and Paris green, hellebore and like material. More re- 

 cently, at least two firms have manufactured dust sprayers on a 

 larger scale, to be placed on wagons, and intended for use in large 

 nurseries or orchards. One called the "Cyclone Sprayer," and 

 made in Kansas City, is figured herewith, Fig. 116. This machine 

 and a smaller one made by the same firm are shown in use on pages 

 88 and 89. A dry Bordeaux and certain caustic compounds are used 

 with these sprayers, or a combination of dry Bordeaux and Paris 

 green are manufactured, though directions are given to purchasers 

 whereby many of these compounds may be made at home. The 



claims made by the manu- 

 facturers and several of the 

 users of dust sprays are many: 

 They say there are no bar- 

 rels of liquid to be hauled, 

 and this is of great value where 

 it' is hard to carry or obtain 

 water ; that the cloud of dust 

 envelopes immense numbers of 

 trees, sometimes covering an 

 entire orchard ; that it is im- 

 posible to get too much of the 

 spray ; that it costs less than 

 the manufacture and application of liquid sprays, etc. These advan- 

 tages, barring the item of less expense, which must vary, are self- 

 evident. On the other hand there are certain disadvantages in this 

 method equally apparent, namely: When a strong wind is blowing it 

 cannot well be used, one being obliged to keep to the windward side 



■.\^.V'\llill///A 



Fig. III. — Double Vermorel with Y. 



