66 PAPERS OX INSECTS AFFECTING VEGETABLES. 



Paris green will kill the sugar-beet webworm when used at the rate 

 of 2 pounds in 100 gallons of water, but its action is comparatively 

 slow. It can also be safely used on sugar beets at the rate of -1 

 pounds in 100 gallons of wattr. although this amount is excessive and 

 unnecessarily expensive. All things considered, either formula Xo. 

 1 or formula No. 2 can be depended on for the most satisfactory 

 results. 



Many beet growers demand that an insecticide to be used against 

 webworm- shall be immediately effective. It is of course unreason- 

 able to expect immediately fatal result- from a stomach poison. 

 "When Paris green is properly applied against this webworm at the 

 rate of 3 pounds in 100 gallons of water, a fairly large number of 

 dead webworms will be found about the sprayed beets at the end of 

 24 hours, and at the end of three days practically all webworms 

 should be dead. 



Dusting with Paris green and lime has also proven effective against 

 this webworm when used at the rate of from 2 to I pounds of the 

 poison in 100 pounds of air-slaked lime. The " dust " may be ap- 

 plied by shaking it from a coarse sack or with a " powder gun."' 

 This method is slow, would increase the cost of application more than 

 50 per cent, and is difficult to apply in an even coating. 



Occasionally a field of beets may have been irrigated just before 

 an infestation of webworms become- apparent, and in such a case 

 the soil is likely to be so wet that the prompt use of a sprayer will 

 prove impracticable and dusting may then be employed to advantage. 



SPRAYING MACHINERY. 



For spraying large areas of sugar beets a geared traction sprayer 

 of 125 gallons' capacity (figs. 20-22) will prove profitable; but for 

 the average grower, whose planting does not exceed 20 acres, this 

 type of machine is too expensive and unnecessarily large, and a 

 -mailer, much cheaper sprayer, which can be assembled at home, will 

 give sati.-factory result-. Such a sprayer may be fitted up by mount- 

 ing a spray pump in a 50-gallon barrel on an ordinary one-horse, 

 two-row beet cultivator, from which the " handles " and " -hoes " 

 have been removed. This arrangement will be readily under-i 

 by referring to the accompanying illustrations (figs. 15. 10). The 

 four-row attachment is connected with the pump by a rubber 1 

 and is fastened to sections of plank which are bolted to the culti- 

 vator frame and extend out behind the wheels. The row attachment 

 i.^ made of J-inch and J-inch iron pipes and can be put together by a 

 plumber. Three types of row attachments are illustrated. Number 

 1 tfig. 17) is the simplest and will give satisfaction under ordinary 

 condition.-. This may be built to cover eight rows of beeU instead 

 <>f four. The eight-row attachment, however, is rather cumbersome 



