INSECTICIDES. 7 



but to be used with great caution, if at all. If applied in 

 the growing season, or more than once, especially upon 

 young trees, it is apt to kill the bark. If the Paris green 

 contains soluble arsenic, much harm may be expected to 

 result. 



Hellebore. See WHITE HELLEBORE. 



Hot water. Submerge affected plants or branches in water 

 at a temperature of about 125. For aphis. It will also 

 kill rose-bugs at a temperature of 125-135. 



Kerosene. In pure state, kerosene has been used as an 

 insecticide upon many plants, with various results. It 

 does not appear to injure the coleus, grape, peach, and pea, 

 but does injure the potato, tomato, and gooseberry and 

 other plants. It is not to be recommended unless in the 

 form of emulsion, however, or much diluted. 



Under the name of paraffine oil it is used in England as 

 follows : When plants are infested with lice, wet them at 

 intervals of three or four days for about three weeks with 

 diluted paraffine in the proportion of a wineglassful to 

 watering-can of water. 



Kerosene emulsion. 1. Cook's emulsion. Soft soap 1 

 quart, or hard soap preferably whale-oil soap pound ; 

 2 quarts hot water ; 1 pint kerosene. Stir until all are 

 permanently mixed, and then dilute with water to one-half 

 or one-third strength. A good way to make the emulsion 

 permanent is to pump the mixture back into the receptacle 

 several times. Makes a permanent emulsion with either 

 hard or soft water. 



2. The Hubbard-Kiley, or standard emulsion. Hard 

 soap, pound ; boiling soft water, 1 gallon ; kerosene, 2 

 gallons. Churn or pump the ingredients vigorously 15 or 

 20 minutes. Dilute 10 or more times when using. 



Two ounces balsam of fir added to the above appears to 

 increase its efficiency, and. it causes it to adhere to foliage 

 better. \ pint spirits of turpentine is sometimes added. 



3. Pyre thro- kerosene emulsion. In the place of pure 

 kerosene in the above emulsions, use a kerosene decoction 



