22 BULLETIN "101, U. S. DEPARTMENT OF AGRICULTURE. 



Effect on larv(c. — The cedar chest above described was used also 

 for a test against hirva\ In 1915 flannel was placed in this chest, and 

 10 one-half to three-fourths grown larvae Avere added every two 

 weeks until a total of GO was reached. Examination made two 

 months after the last addition of larvae showed seven live larvaj; 

 3G larva? had died and 17 had pupated. Of the 17 pupas 2 died in 

 the pupa stage and 15 emerged as moths, but died before any eggs 

 Avere laid. The flannel had been fed upon considerably, but was not 

 badly eaten. 



Two years later (1917) this experiment was duplicated hj adding 

 25 one-half to three-fourths grown larvae at one time and allowing 

 the experiment to run 33 days. The results were almost identical 

 with those of the first experiment. 



E-ffect on eggs. — A small piece of flannel containing many clothes- 

 moth eggs was placed in the cedar chest described above. At the 

 end of 23 days practically all of the eggs had hatched, but all of the 

 resulting larvae died almost immediately. A duplicate test was made, 

 with identical results. The check flannel placed in a battery jar 

 showed many eggs hatched and all larvae alive. 



The results of the foregoing tests indicate that adult clothes moths 

 and young clothes-moth larvae are killed when placed in a cedar chest, 

 but that the larval one-half to full grown may live for a considerable 

 length of time, and even, in some cases, reach the pupa stage and 

 emerge as moths. It was observed in all tests that very little feeding 

 was done. 



BED CEDAE SHAVINGS AND CHIPS. 



Effect of red-cedar shavings and chips on clothes-moth adults^ 

 larvce., and eggs. — In cage tests cedar shavings and chips did not 

 entirely prevent the moths from laying eggs on the treated flannel, 

 yet they showed an apparent protective power when the treated 

 flannel was compared with the untreated. 



When cedar shavings and chips were thoroughly applied to larvse 

 more than one-fourth grown, they had no killing effect, but were 

 somewhat effective against very young larvae. Cedar chips burned 

 in a fumigating box, at the rate of 2-| grams to 13 cubic feet, were not 

 effective against larvae. 



Cedar chips proved ineffective in preventing the hatching of eggs. 



Red-cedar leaves were entirely ineffective in killing larvae and pre- 

 venting moth infestation. The oil of cedar leaves, however, proved 

 very effective for both purposes. 



In addition to the above forms of cedar, very small boxes having 

 an approximate content of 432 cubic inches {\ cubic foot), made of 

 freshly cut red-cedar lumber, were used for certain tests. Adult 



