- 32 - . 
Van Lccuwcn (-104) , at tho 1928 codling moth conferonco of the Bureau 
of Entomology, reported tccts of various insecticides for the control of 
the codling moth in the Rivcrton, N. J., district. 
"1/e found that throe early applications of lead arsenate against the 
first brood followed by three applications of pyrethrum, nicotine, or 
dcrris against the second brood gave good results. Chech trees showed 83 
percent of all apples free from v/orms, whereas the lead-arscnate plat shov/ed 
97 i^ercent, nicotine 95 percent, pyrethrum 93 percent, and derris 95 percent 
free from v/orms." In laborator;/ tests v/ith ncv/ly hatched codling moth 
larvae, derris, pyrethrum, and nicotine gave very cncourc^^ing results, 
further laboratory tests v/ill be made. 
The Bureau of Entomology (103), in its 1928 annual report, mentioned 
that extracts of dcrris at 1 to BOO had been tested as contact sprays and as 
ovicides against the codling moth. 
Mctcalf and Flint (58) in 1928 summarized cv.rrent information on derris, 
Derris is recommended for aphids, for lice and fleas on domestic animals, and 
as a wash for killing ox vrarbles in the backs of cattle. Derris sprays are 
effective in killing the yoiing nymphs of apple leafhoppers, and. against 
greenhouse thrips. For checking sheep lice in v/inter when dipping cannot be 
done safely, dusting pyrethrum or derris into the wool is recommended. Dry 
powdered derris or pyrethrum sifted into the fur of pets controls fleas. 
