- 547 - 
2 percent nicotine used at the rate of 50 lb. per acre killed 52.3 per- 
cent of the aphids infesting the tips of the growing shoots and 83.2 
percent when used at the rate of 90 lb. per acre. Nicotine and soap used 
at the rate of 100 lb. per acre destroyed 85.5 percent. 
ANONYMOUS (2297) 
1923. SCIENCE SERVES WISCONSIN FARMS. Wis. Agr. Expt. Sta. Bull. 352, 
122 pp. , illus. 
J. E. Dudley made exhaustive tests by using nicotine sulphate in 
dust carriers against the eggs, larvae , or adults of the following 
insects: squash bug, Colorado potato beetle, potato flea beetle, 
onion thrips, turnip aphid, melon aphid., two species of cabbageworms 
(pp. 68-70), and striped cucumber beetle (p. 71). 
Eluke and Dudley conducted tests with nicotine dusts against the 
pea aphid, and when power dusters were used the percentage killed 
ranged from 55 to 95, depending somewhat on the percentage of nico- 
tine in the dust, the temperature, and the absence or presence of 
wind (p. 72) . 
CHITTENDEN, F. H. (2298) 
1923. THE STRIPED CUCUMBER BEETLE AND HOW TO CONTROL IT. U. S. Dept . 
Agr. Farmers' Bull. 1322, 16 pp., illus. [Abstract in Rev. Appl. 
Ent. (A) 11: 369. 1923.] 
Hicotine dust is recommended for the control of Diabrotica 
vittat a F. on Cucurbitaceae. This consists cf 4 lb. nicotine sulphate 
(40 percent nicotine) and 96 lb. calcium hydrate, or 72 lb. kaolin and 
24 lb. lime. The most effective machine for its application is of 
the knapsack bellows type and it should be applied thick enough to 
form a good covering on the plants and the surface of the ground about 
their base (about l/4 - l/2 oz. per hill). 
DUDLEY, J. E., WILSON, H. F. , and l.'IECUH, W. D. (2299) 
1923. NICOTINE DUST KILLS CUCUMBER BEETLES. Wis. Agr. Expt. Sta. 
Bull. 355, 10 pp., illus. [Abstract in Rev. Appl. Ent. (A) 
11: 544-545. 1923.] 
Nicotine dust is the most effective remedy against the striped 
cucumber beetle (D: abroci ca tr^ ttata iF« ). Dusts containing copper sul- 
phate or gypsum with a lime carrier retain their strengths and are 
effective under all conditions. A 10 percent nicotine sulphate dust 
would be preferable but is unobtainable and 5 percent is used. Nico- 
tine dusts with active carriers such as hydrated lime and unslaked lime 
lose strength rapidly and are only effective under the most favorable 
conditions. For small plants 14 lb. of dust to the acre is sufficient. 
Dusting will be most successful in windless weather at a temperature 
of £5° F. or higher. 
