-95a- 
The Department in a press release dated January 13, 1936, called attention 
to certain disadvantages that bar the use of rotenone insecticides for 
some types of insects. Derris is not effective against all insects. It 
repels, but has no ether effect on the southern armyworm, 
Sullivan, Phillips, and HcGovran (396) in 1938 reported that a single 
spray test indicated that an extract of the fruit of the Amur cork tree 
( Phellodendron amurense ) of China and Japan possessed low toxicity to the 
larvae, but this also applies to derris and pyrethrum. 
