THE BLACKHEAD EIRE WORM OF CRANBERRY. 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 
Avater 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 
~be added to a solution containing lime-sulphur or any other similar 
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 Per Acee. 
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 oe Nozzle. 
The use of a nozzle, preferably of the large eddy-chamber type 
shown in figure 13, equipped with a disk, throwing a medium-fine 
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. 
