INJURIOUS INSECTS OF I909 AND IQIO. 153 
ever, must be taken to obtain the right dilution as per directions 
given on container, or burning of the leaves will result. 
Parts GREEN: This is the old stand-by, and is still used by 
many where an arsenical insecticide is necessary. Our experiments 
on orchard trees and other reports indicate that arsenate of lead is 
better in every respect, although our potato expert at the Experi- 
ment Station, Mr. Kohler, who has experimented with many of the 
stomach insecticides for potato beetles, finds Paris green the most 
satisfactory for these pests. It is generally used at the rate of I 
pound to 50 gallons of spray. In using always first make a paste 
of the Paris green and water, and then add to the spray material. 
If water alone is used, 2 to 3 pounds of stone-lime should be added. 
If Bordeaux mixture is used the addition of lime is not necessary. 
Porasstum SuLFIDE (Liver of Sulfur): 
3-5 Ounces of potassium sulfide. 
10 Gallons of water. 
This is used in place of bordeaux to avoid spotting of foliage 
and fruit. It is considered to be especially effective against powdery 
mildews, such as the gooseberry mildew. It is also quite exten- 
sively used in greenhouses and on shrubbery. 
PYRETHRUM oR INSECT PowpER: This is a powder from the 
ground up flowers of the pyrethrum plant. It is a contact insecti- 
cide and is used against fleas, cockroaches, etc. If the powder 1s 
burned in a room the fumes will destroy mosquitoes and flies. 
Tue Restn-Lime Mixture: This is a mixture often used in 
combination with a fungicide or an insecticide to insure the sticking 
of the necessary poisonous material to smooth, glossy leaves. 
Formula: 
Pulverized resin, 5 pounds. 
Concentrated lye, 1 pound. 
Fish or other animal oil, 1 pint. 
Water, 5 gallons. 
Place the oil, the resin and one gallon of the water in an iron 
kettle, and heat until the resin softens, then add the lye and stir 
thoroughly. Add to this four gallons of hot water, and boil until 
a little mixed with cold water gives a clear, amber colored liquid. 
Add water to make up to the five gallons. 
This is our stock solution. In spraying with Paris green or 
Bordeaux mixture take two gallons of this mixture, dilute it to 10 
gallons and add to 50 gallons of spray. 
