- 54b - 
CAMPBELL, R. E. (2290) 
1922. NICOTINE DUST EOR CONTROL OE TRUCK-CROP INSECTS. ' U. S. Dept. Agr. 
Farmers' Bull. 12S2, 24 p., illus. [Abstract in Rev. Appl. 
Ent. (A) 12: 179. 1924.] 
The advantages of nicotine dust over liquid sprays for the 
control of injurious insects on vegetable crops are pointed out 
and instructions in its preparation and use are given, with des- 
criptions of suitable machinery. 
HAMILTON, C. C. (3291) 
1922. NEW DEVELOPMENTS IN THE CONTROL OF TRUCK CROP INSECTS. Md. Agr. 
Soc. Rept. 7, pp. 346-352. 
In the use of nicotine dusts, hoods or cloth trailers have 
been used with excellent success to confine the dust for a longer 
time around the insect and cause a thorough distribution to all 
parts of the infested plant. A cloth trailer from 10 to 15 ft. 
long may be used on a power or traction duster in dusting most 
crops with a nicotine dust (p. 348). The striped cucumber beetle 
(p. 349) , cucumber aphid, and pea aphid (p. 350) have been controlled 
with nicotine dusts. 
HARTZELL, E. Z. (2292) 
1922, PEAR PSYLLA PROBLEMS. N. Y. State Hort. Soc, Proc. 67th Ann. 
Meeting, pp. 50-55. [Abstract in Rev. Appl. Ent. (A) 10: 325-326. 
1922.] 
Nicotine dust killed older nymphs and adults ( Psylla pyricola ) 
but did not kill younger nymphs enveloped in honeydew. Lime-nicotine 
and sulphur-nicotine dusts gave equal control but the lime dust 
covered better. Spraying with 2 l/2 gal. lime-sulphur, 50 lb. hydrated 
lime, 1 pt. nicotine sulphate, and 100 gal. water at a pressure of 300 
lb. an averageof 5.3 gal. being used per tree, gave a killing efficiency 
of 98.7 percent. The conclusions arrived at are that a heavy lime- 
nicotine spray, when thoroughly applied at the .proper time, will 
kill 98 percent or more of the first brood. 
HEADLEE, T. J. (2293) 
1922. SPRAYING VERSUS DUSTING OF TJHITE POTATOES FOR THE CONTROL OF 
THE PINK AND GREEN LICE INFESTING THEM. N. J. Dept. Agr, Bull. 31, 
pp. 218-220. 
Field experiments indicate that as high a percentage of aphids 
on potatoes can be destroyed with nicotine dust as can be killed 
with nicotine sprays, but rainy weather interferes with dusting. The 
best mixture probably consists of 90 percent good hydrated lime, 5 
percent ground burned lime and 5 percent Black Leaf 40, making a 
hydrated ground burned lime mixture impregnated with 2 percent nico- 
tine. 
