344 MAINE AGRICULTURAL EXPERIMENT STATION. I916. 



foliage, it is likely to burn it. So it is advisable, unless the emulsion is 

 of good quality, to throw out the last few gallons, making no use of it. 

 It is best to dilute and apply kerosene emulsion as soon as it is pre- 

 pared. 



"Avoid using alkali or any hard water in making the emulsion, as it 

 will cause the oil to separate and rise to the top. Any clean, soft water 

 will usually give good results. 



Formula C. — Miscible Oils. 



There are several miscible oils upon the market which may be added 

 directly to water forming a milky emulsion at once. In the preparation 

 of any of these, such as "Scalecide," or "Target Brand Scale Destroyer" 

 or "Killoscale," add the oil directly to the water with a little stirring. 

 One gallon of the miscible oil in 30 to 50 gallons of water will make a 

 mixture, which in most cases will be strong enough to kill plant lice, 

 if thoroughly applied. 



Formula D. — Whale-oil or Fish-oil Soaps. 



The so-called whale-oil or fish-oil soaps which are quite extensively 

 used for the destruction of plant lice, will usually be effective if thor- 

 oughly applied in the proportion of one-pound of the soap to each six 

 or eight gallons of water. There are numerous brands of these soaps 

 upon the market. Among those that have been used quite successfully 

 are Good's Whale-Oil Soap and Bowker's Tree Soap. 



^ ^ ^c * * * * -.j; :!: 



In recent years tobacco extracts have rapidly taken the place of other 

 remedies for aphids, and well informed apple growers are using them 

 almost to the exclusion of other insecticides. It should be remembered 

 that this is a contact insecticide and kills only the insects actuaily 

 touched. It is, therefore, necessary to be very thorough in the spraying 



