66 Farmers’ Bulletin 1220. 
ROSIN FISH-OIL SOAP. 
Abundant experience has shown that a small amount of soap 
added to sprays increases their spreading and adhesive qualities. 
Of the various soaps available the rosin fish-oil soap has proved best 
and has come into considerable use in sprays for grapes, plums, 
cranberries, etc. The soap is used at the rate of 1 pound to 50 gallons 
of spray and may be added to a spray composed of Bordeaux mix- 
ture, arsenate of lead, and nicotine sulphate, or used with any one 
of these, in water. 
In the absence of fish-oil soap, ordinary laundry soap may be 
used at about twice the strength of the fish-oil soap, namely, 2 pounds 
to 50 gallons of spray. 
Soap sprays may also be used for the destruction of various soft- 
bodied insects, as plant-lice, the leafhopper, etc. For plants in 
foliage the soap, according to its quality and the insects to be 
treated, is used at the rate of 1 pound to 3 or 4 gallons of water, or 
at even greater dilutions. If a fish-oil soap be employed for the 
treatment of vines during the dormant condition, it should be used at 
the rate of 2 pounds for each gallon of water, as for the grape scale. 
SELF-BOILED LIME-SULPHUR MIXTURE. 
The self-boiled lime-sulphur mixture, while primarily a fungi- 
cide for the treatment of stone fruits, has come into some use as an 
insecticide. According to experiments by the New Jersey Agricul- 
tural Experiment Station it is effective in preventing injury to 
grapes by the rose-chafer (pp. 20-23). 
Except under special conditions, sulphur sprays should not be 
used for spraying grapes. 
The self-boiled lime-sulphur mixture may be made as follows: 
Stone im@ee ss. 2Ue Aue ee Eee ee ee pounds__ 8,or 2 
Sulphur (commercial ground SORA OWErS) eee eres Go 2. iy Sora 
Wha ter sto mina ceed a oe a TE ee eee ee gallons__ 50, or 124 
The lime should be placed in a barrel or suitable container and 
enough water poured on almost to cover it. As soon as the lime begins 
to slake the sulphur should be added, after first running it through a 
sieve to break up the lumps. The mixture should be stirred constantly 
and more water added as needed to form a thick paste at first and 
then gradually a thin paste. The lime will supply enough heat to boil 
the mixture several minutes. As soon as it is well slaked cold water 
should be added to coo! the mixture and prevent further cooking. 
It is then ready to be strained into the spray tank, diluted, and 
apphed. 
40 Commercial ground sulphur is the cheaper and is equally as satisfactory as the flowers 
of sulphur. 
