28 BULLETIN 707, U. S. DEPARTMENT OF AGRICULTURE. 



HOT WATER. 



Effect on clothes-moth larvae and eggs. — Both larvae and eggs of 

 the clothes moth were killed by dipping infested flannel for 10 sec- 

 onds in water at a temperature of 140° F. When dipped for the 

 same length of time in water at a temperature of 122° F., however, 

 neither the larvae nor the eggs were killed. 



SUMMARY. 



1. Naphthalene was uniformly effective in protecting woolens 

 from clothes-moth infestation and in killing all stages of the insect. 



2. Camphor, though more or less effective against all stages of 

 the clothes moth, proved considerably less active than did naphtha- 

 lene. 



3. A red-cedar chest readily killed all adult moths and showed con- 

 siderable killing effect upon young larvae. It did not prevent the 

 hatching of eggs, but killed all the resulting larva? almost imme- 

 diately. 



4. Red-cedar chips and shavings, while not entirely effective in 

 keeping the adult moths from laying eggs on the flannel treated, ap- 

 peared to protect it from appreciable injury when used liberally. 

 The chips and shavings showed practically no killing effect against 

 eggs, or against the larvae when over one- fourth grown. 



5. Paradichlorobenzene was not effective against adults and larvae 

 in a room fumigation test of 21 hours duration, but killed larvae 

 effectively in battery- jar tests. 



6. Pyrethrum powder readily killed clothes-moth larvae. 



7. Various mixtures of oils were effective in protecting clothing 

 from infestation, when used undiluted or but slightly diluted, and 

 killed 100 per cent of the larvae when used undiluted. 



8. Laundry soap killed both larvae and eggs when used in strong 

 solution. 



9. Various tobacco extracts containing nicotine and tobacco pow- 

 ders, when used at reasonable strengths, proved of no value against 

 this insect. 



10. Lavender flowers, cayenne pepper, and allspice were ineffect- 

 ive and cloves and oil of lavender effective in protecting flannel 

 from moth infestation. 



11. Powdered cloves, sodium fluorid, and 95 per cent alcohol, un- 

 diluted, killed larvae. 



12. Allspice, angelica root, black pepper, borax, cayenne pepper, 

 colocynth pulp, eucalyptus leaves, formaldehyde, hellebore, lead car- 

 bonate, lead oxid, lime, quassia chips, sodium bicarbonate, and sodium 

 carbonate were of no value in killing clothes -moth larvae. 



