- 483 - 
of P teronus r i"besii Scop., whereas a 2 percent nicotine dust gave only 
about 80 percent control. 
In sprays against Aphis pomi DeG. (green apple aphid) 2 1/2 
lb. derris in 100 gal. water, with soap, gave complete control, "but 
without soap it was less effective at twice that strength; 40- 
percent nicotine sulphate (1:800) gave about 95 percent control with 
or without soap. As a dust 10 percent derris with hydrated lime 
was much less effective than 40-percent nicotine sulphate at 5 
percent possibly because of lack of moisture. 
In laboratory tests with Macro siphum s olanifolii Ashm. 
(potato aphid) l/2 pt. 40-percent nicotine sulphate to 100 gal. 
water was as effective as 5 lb. derris both giving complete control. 
In a laboratory experiment with Aphis ru mici s L. 5 lb. derris 
in 100 gal. water gave only 40 percent control in the same time 
that l/s pt 30 percent nicotine sulphate to 100 gal. gave 90 per- 
cent control, but two days later all the aphid s treated with 
derris were dead. 
RICHARDSON, C. H, and SMITH; C. R. (2072) 
1926. TOXICITY OF DIPYRLDYLS AMD CERTAIN OTHER ORGANIC COMPOUNDS AS CON- 
TACT INSECTICIDES. Jour. Agr. Res. 33 (7): 597-609, illus. 
[Abstract in Rev. Appl. Ent. (A) 15: 140. 1927.] 
A crude dipyridyl oil was found to be highly toxic, but less 
so than nicotine, against six species of aphids. In submergence 
tests, the crude oil w-: s more toxic than nicotine to two species 
of coleopterous larvae (L eptinotarsa dec em line at a Say. and Lema 
trilineata Oliv.) and one specie of Lepidoptera ( Ephestia kuhniella 
Zell.), but less toxic than nicotine to adult potato beetles and 
to silkworms. 
BRITTON, XI. E. (2073) 
1927. TWENTY- SIXTH REPORT OF THE STATE ENTOMOLOGIST OF CONNECTICUT 1926. 
Conn. Agr. Expt. Sta. Bull, 285, pp. 159-283, illus. 
Pea aphids ( Illinoia pisi Kalt . ) were nearly all killed by 
a nicotine spray. The young squash bugs ( Anasa tristis DeG.) can 
be killed by a spray of 40-percent nicotine solution (1 to 150). 
In Massachusetts the same spray killed the eggs of the squash 
borer ( Melittia satyrinif ormi s Hubn.). Plants bearing potato 
flea beetles ( Epitrix cucumeris Harr. ) can be freed by spraying 
with nicotine sulphate solution. The asparagus beetle ( Crioceris 
asparafi-j Linn.) may be killed in home gardens by spraying with 
nicotine solution (pp. 170-173) . 
GUYTON, T. L. , and McCUBBIN, W. A. (2074) 
1927. ROSE INSECTS AND DISEASES. Pa. Dept. Agr. Gen. Bull. 441, 10 
(5) : 1-17, illus. 
Aphids ( Macro siphu m rosae) and Thrips tabaci Lind. on roses 
are controlled by the use of nicotine. In the sprays use 40 per- 
