THE BLACKHEAD FIREWOEM OF CEANBERRY. ' 35 



harm, but on the other hand will give no better control, and if used 

 at the rate of 1 part to 1,000 parts of water with the above proportion 

 of soap, about one-third to one-half more gallons per acre should be 

 used and then only on light infestations. 



To make 200 gallons of this material the tank should be run 

 about three-fourths full of water while washing through the sieve 

 8 pounds of the soap, which should be previously broken up in warm 

 water or otherwise thoroughly softened. One quart of the 40 per cent 

 nicotine sulphate should then be poured slowly into the tank with the 

 remainder of the water necessary to make up the 200 gallons while 

 the whole solution is being thoroughly agitated to insure proper mix- 

 ing of the ingredients. It is then ready to be applied to the vines. 



The nicotine sulphate is added last and in a diluted form to pre- 

 vent the precipitate which forms when concentrated solutions of 

 nicotine sulphate and soap are brought together and which decreases 

 the effectiveness of the spray solution. 



If these materials are to be combined with Bordeaux mixture, the 

 proportions of nicotine sulphate and soap and the process of mixing 

 is the same as though water were used to make the solution as 

 described above. Nicotine sulphate can be mixed with lime-sul- 

 phur solutions in all the usual proportions, but no soap should 

 de added to a solution containing lime-suljjhur or any other s-imilar 

 compound, else a disintegration of the ingredients will take place 

 which will not only weaken the effectiveness of the combination but 

 also may cause severe injury to the cranberry vines. 



The Amount to be Used Pee Acke. 



Depending. on the severity of the infestation, not less than 250 to 

 300 gallons of this solution should be used in spraying an acre of 

 vines, as good control can not usually be secured with a less amount 

 than this. If it is preferred to use 40 per cent nicotine sulphate at 

 the rate of 1 to 1,000, rather heavy applications will have to be made, 

 less than 400 or 500 gallons per acre never being used. 



Type of Nozzle. 



The use of a nozzle, preferably of the large eddy-chamber type 

 shown in figure 13, equipped with a disk, throwing a medium-fi-ne 

 mist which will quickly and easily wet the terminal whorl of leaves 

 on the tip of the uprights, is to be recommended. The Vermorel 

 type of nozzle is too small and throws too fine a mist (fig. 15), most 

 of which is driven away by the wind and thus fails to give the de- 

 sired results. The spray gun should be used only on very large and 

 thinly infested bogs and then great care must be taken to see that no 

 uprights are missed and that a uniform application is made with 

 the pressure at the tank never less than 200 pounds per square inch. 



