CONTACT INSECTICIDES 23 



inent brands: "Scalecide," ''Kil-O-Scale," "Tar- 

 get-Brand," and "Orchard Brand." 



Home-made miscible oils ^'* — Prof. C. L. Penny 

 has developed methods of preparing miscible oil at 

 home. There are two steps in making a miscible 

 oil : ( I ) preparing the emulsifier or soap solu- 

 tion, (2) mixing the mineral and vegetable oils 

 with the emulsifier to produce the final product, 

 miscible oil. The process is rather long and la- 

 borious. 



Carbolic acid emulsion 



This emulsion is formed by dissolving i pound of 

 hard soap in i gallon of hot water. After the soap 

 is dissolved, add i pint of crude carbolic acid. 

 Then agitate the mixture until an emulsion is 

 formed. For use, dilute with 30 parts of water. 



Lime-sulphur ^^ 



It is probably the best and most universally used 

 insecticide for scale insects. It is also practically 

 a specific for blister-mite and of great use in con- 

 trolling the pear psylla, certain fungous diseases, 

 etc. It was used originally as a sheep dip but was 

 first tried as an insecticide in California in 1886. 

 It was not tried in the East until 1894 when its use 

 did not seem to prove successful. Nothing more 

 was done with the lime-sulphur wash in the East 

 until 1900 when it was tried again and gave prom- 

 ising results. The first formulae included salt. 

 Later formulae differed somewhat in proportions, 

 but the following is a representative one: Quick- 

 lime, 20 pounds ; sulphur, 1 5 pounds ; water, 50 gal- 

 lons. 



49 Penny— Ann. Rpt. Penn. State Coll., 1907-08, p. 228. 



Phillips— Va. Expt. Stat., Bull. 179. 

 ^'^ Quaintance — U. S. Dept. Agr., Yearbook 1906, p. 429. 



