24 BULLETIN 707, U. S. DEPARTMENT OP AGRICULTURE. 



Commercial crude carbolic acid, used at the rate of 1 part of the 

 acid to 10 parts of water, proved effective in protecting flannel from 

 moth infestation. 



Effect on larvce. — Experiments with three different oils of the na- 

 ture of kerosene, and one experiment with gasoline sprayed on pieces 

 of flannel infested with larvae, resulted in the killing of all larvae in 

 each case. Oil emulsions proved of little value, when diluted as 

 much as 1 part of the emulsion to 65 parts of water, against larvae, 

 as well as against adults. Oil emulsions should be used either un- 

 diluted or only slightly diluted. • 



Commercial crude carbolic acid, used at the rate of 1 part of the 

 acid to 10 parts of water, killed 85 per cent of the larvae on badly 

 infested flannel. 



The vapors evolved by kerosene in a closed jar killed larvae in 

 4-0- hours, the experiment being so arranged that the larvae were not 

 in contact with the oil. 



Effect on eggs. — Two pieces of flannel, each containing 10 or more 

 clothes-moth eggs, were sprayed with gasoline, with the result that 

 all of the eggs were killed. Also, 3 and 5 per cent solutions of com- 

 mercial crude carbolic acid killed all eggs in similar tests. 



Effect on clothes-moth larvm. — Fish-oil soap, used at the rate of 

 1 pound of the soap to 12, 25, and 40 gallons of water, killed all of 

 the larvae when sprayed on infested flannel. Laundry soap in two 

 tests, in which it was used at the rate of 1 pound to 10 gallons of 

 water, killed all of the larvae. 



Effect on eggs. — Laundry soap was sprayed on eggs on flannel, the 

 strengths used being 1 pound of soap to 10, 20, and 40 gallons of 

 water. The strongest solution killed most of the eggs, but the two 

 weaker solutions were entirely ineffective. 



The above results with soap indicate that spraying or washing 

 clothing with strong soap solution will free it from larvae and eggs 

 of the clothes moth. 



NICOTINE EXTRACTS AND TOBACCO POWDER. 



Effect on clothes-moth ad,ults. — Flannel dusted with powdered 

 tobacco leaves containing 4.56 per cent nicotine remained free from 

 moth infestation in a single cage test, the untreated flannel, under 

 the same conditions, becoming infested with 12 larvae. Tobacco pow- 

 ders containing 0.4 per cent and 0.8 per cent of nicotine were not 

 effective in preventing infestation in cage tests. Since the average 

 tobacco powder found on the market contains a great deal less than 



