- 550 - 
water, may be relied upon to give the "best results. The "best dust 
mixtures for controlling aphids, redbugs, curculio ( Cono t rache lus 
nenuph ar ) , codling moth, and other chewing insects consists of 65 
percent superfine dusting sulphur, 10 percent lead arsenate, 5 
percent nicotine sulphate, and 20 percent carrier. 
CORY, E. N. , and ?O r ITS, S. F. (2307) 
1924. THE CONTROL OE TRUCK CROP PESTS BY DUSTING. Md. Agr. Expt . Sta. 
Bull. 261.-' pp. 121-155, illus. [Abstract in Rev. Appl. Ent. 
(A) 12: 24-4-245. 1924.] 
Against Aphis gp_s s yp i i Glov. (melon aphid) the application of 
a 2 percent nicotine dust from a sulphate source used at the rate 
of 25 l"b. to the acre produced a mortality of almost 100 percent. 
Eairly good results against garden flea hopper (Halticus citri Ashm.) 
were obtained with a 2 percent dust when used at the rate of 50 
lb. to the acre. In a box fumigator only 10 to 12 lb. nicotine dust 
per acre are required to control Aphi s gossypii . Nicotine dust was 
also used against cucumber beetle Di abrotica vittata E. 
Against the bean aphid ( Aphis r umicis L. ) a 3 percent nicotine 
dust (sulphate source) at the rate of 40 lb. per "ere is recommended 
while against the asparagus beetles Crioce ris asparagi Oliv. .and C. 
duodecimpunctat a L. a 2 percent nicotine dust made from either a 
sulphate or a free nicotine source may be used. 
DRAKE, C. J., and EENTON, E. A. (2303) 
1924. MELON AND CUCUMBER INSECTS. Iowa Agr. Expt. Ste. Circ. 90, 8 pp., 
illus. [Abstract in Rev. Appl. Ent. (A) 12: 446. 1924.] 
The preparation of nicotine dust is described. 
HARTZELL, F. Z. (2309) 
1924. DUSTING AND SPRAYING TO COl'TROL GRAPE R00T-U0RM. N. Y. (Geneva) 
Agr. Expt. Sta. Bull. 519, 29pp., illus. 
Preparations containing intimate mixtures of various proportions 
of monohydrated copper sulphate, hydrated lime, and lead arsenate, 
known as Sander's dusts, wero- used in most of the field tests. In 
order to determine the value of nicotine for the control of the root- 
worm (Fidia viticida Ylalsh) , a Sander's dust containing 2 percent 
nicotine and a lime-nicotine preparation with 2.2 percent nicotine 
were t ried. The addition of nicotine to these dusts did not increase 
their effectiveness (pp. 3-4)* 
HEADLEE, T. J. (2310) 
1924. INSECTICIDES FOR THE POTATO CROP. N. J. Dept. Agr. Mil. 39, 
pp. 178-184, illus. [Abstract in Rev. Appl. Ent. (A) 14: 157. 1926.] 
