ENGLISH: ILLINOIS TREES: THEIR INSECT ENEMIES 91 



made from DDT, powdered skim milk, and water. To a mixture 

 of 4 parts of 50 percent DDT wettable powder and 1 part of pow- 

 dered skim milk, enough water is added to make a smooth slurry 

 that can be applied to the trunks of trees with a paint brush. 

 Dead and dying branches should be pruned from infested trees 

 and burned. Borers in the wood can be killed if the tunnels are 

 cleaned out with a piece of wire and carbon disulfide or nicotine 

 sulfate is injected into the holes with an oil can. The holes 

 should be plugged with putty after treatment. Carbon disulfide is 

 highly inflammable and can be ignited by a spark or cigarette. 



Control Measure 5. — Apply an oil spray while the plants are 

 dormant: use an emulsifiable dormant oil diluted with water ac- 

 cording to directions of the manufacturer. 



Control Measure 6. — Clip off and destroy infested branches 

 or burn out the webs with a torch. 



Control Measure 7. — Eliminate local infestations by spray- 

 ing the bugs on the trunks of trees and on the foundations of 

 buildings with a lindane or a dieldrin preparation: 1 pint of 20 

 per cent lindane emulsifiable concentrate to 5 gallons of water, 

 or 1 pint of 20 per cent dieldrin emulsifiable concentrate to 10 

 gallons of water. Repeat applications as needed. 



Control Measure 8. — Apply a lindane spray : 1 pint of 20 per 

 cent lindane emulsifiable concentrate or 1 pound of 25 per cent 

 lindane wettable powder to 100 gallons of water. 



Control Measure 9. — Spray with one of the following mate- 

 rials: li/o to 2 pounds of 15 percent Aramite wettable powder or 

 25 per cent chlorobenzilate wettable powder to 100 gallons of 

 water. Or use Control Measure 3 at 2-week intervals until the 

 infestation is eliminated. 



Control Measure 10. — Spray with one of the following mate- 

 rials: 1 quart of 20 per cent lindane emulsifiable concentrate or 

 1 quart of 15 per cent dieldrin emulsifiable concentrate to 100 

 gallons of water. 



Control Measure 11. — Spray with toxaphene: 3 pints of 60 

 per cent toxaphene emulsifiable concentrate to 100 gallons of 

 water. 



Control Measure 12. — In late winter, apply a lime sulfur 

 spray: 1 gallon of liquid lime sulfur to 10 gallons of water. CAU- 

 TION: Lime sulfur will blacken house paint. 



Control Measure 13. — Apply a DDT spray: 2 gallons of 25 

 per cent DDT emulsifiable concentrate to 100 gallons of water. 



