FUMIGATING SUBSTANCES 29 



of the infested parts of the building. There is no 

 reason why heat could not be utilized to kill house- 

 hold insects if a practicable way can be found of 

 developing a temperature of 125° F. in a house. 



MISCELLANEOUS MEANS OF FIGHTING IN- 

 SECTS 



Trap lanterns — Lights and lanterns have been 

 recommended and used for many years to catch 

 insects active at night. One called the Hazeltine 

 lantern has been widely advertised. Several ex- 

 periments have been made to demonstrate the use- 

 fulness or uselessness of lanterns for catching in- 

 sects. Perhaps the most extensive one was made 

 at Cornell during 1892. From May 20th to Oct. 

 1st 13,000 insects were caught; yy% were neutral, 

 10 2-5% beneficial, 12 3-5% often pests; of the 

 pests, 84 to 93% were males; of the beneficial, 80 to 

 88% were females; nymphs and larvae were not 

 caught; as many friends as foes were caught; not 

 one codling moth taken. ^" 



In an all-summer experiment Dr. Riley never 

 caught a codling moth : Prof. Stedman caught only 

 2 with 4 lanterns running 100 nights. 



Gasoline torches — An ordinary plumber's ^^ 

 torch or some modification of it has been proposed 

 for killing insects, especially scale insects, on their 

 food plants. Several trials by different experimen- 

 ters on different insects indicate that these torches 

 are hardly practicable. In most cases, the heat suf- 

 ficient to kill the insects injured the plants. 



Tree tanglefoot — A sticky material manufac- 

 tured by the O. W. Thum Co., Grand Rapids, Mich., 

 at about 30c per pound is the same or similar mate- 



62 SHngerland— Cornell Univ. Expt. Stat., Bull. 202. 



63 Forbes— Illinois Expt. Stat., Bull. 89. 



