26 



BULLETIN TOT, U. S. DEPAKTMEXT OF AGRICULTURE. 



MISCELLANEOUS MATEKIALS. 



Effect on clothes-moth adults. — Lavender flowers, cayenne pepper 

 and allspice are of no value in preventing moth infestation. 



Cloves and oil of lavender were effective in protecting flannel from 

 moth infestation. 



Effect on larvce. — Miscellaneous substances found to be effective 

 against larvae are as follows : 



Alcohol (ethyl), 95 per cent solution used as a spray. Cloves, used as a dust. 

 Sodium fluorid, used as a dust. 



Miscellaneous substances found to be ineffective against clothes- 

 moth larva? are as follows : 



Allspice (dusted). 

 Angelica root (dusted). 

 Borax (dusted). 

 Colocynth pulp (dusted). 

 Eucalyptus leaves (dusted). 

 Formaldehyde (sprayed 1 to 10). 

 Hellebore, white (dusted). 

 Lavender flowers (scattered on). 



Effect on eggs. — Sulphur, salt, and borax were of no value in pre- 

 venting hatching of clothes-moth eggs, when thoroughly sprinkled on 

 infested flannel. 



Formaldehyde killed the eggs when used undiluted and when 

 diluted with 5 parts of water, but when used at the rate of 1 part to 

 10 parts of water eggs were not killed. 



At 50 and at 70 per cent a solution of ethyl alcohol destroyed the 

 viability of eggs, but at 30 per cent a solution was ineffective, 



Lead carbonate (dusted). 

 Lead oxide (dusted). 

 Lime [air-slaked] (dusted). 

 Pyrethrum stems (dusted). 

 Quassia chips (dusted). 

 Sodium bicarbonate (dusted). 

 Sodium carbonate (dusted). 



FTJMIGANTS. 



Effect on clothes-Tnoth adults and larva?. — In Table V are recorded 

 the results of fumigation tests with miscellaneous materials. 



Table V. — Results of fumigation tests with miscellaneous materials against 

 adults and larva? of the clothes moth. Tests made in a fumigating house 

 containing 360 cubic feet of space. 



Test 



Name of material. 



Amount. 



Method of application. 



Number used. 



Percentage 

 killed. 



No. 



Adults. 



Larva?. 



Adults. Larvae 



1 



Charcoal 



Grams. 



265 



65 



23 



65 



208 



243 



228 



Burned with forced draft 

 Evaporated over lamp . . 



io" 



20 

 20 

 15 



10 

 10 

 20 

 20 

 10 

 10 



20 



6' 





 30 

 100 



o 



2 



Formaldehvdo 







3 





o 



4 

 5 



do 



Sulphur 



do 



Burned with wick 



20 



6 



do 



inn 



7 



Sulphur and carbon, equal 

 parts 



.do 



20 



50 n 















