- 592 - 
percent of the thrips, although the results were not regarded as 
satisfactory. Other dusts containing nicotine or pyre thrum also 
gave a high degree of mortality "but were not sufficiently repellent. 
OGILVIS, L. (2486) 
1927. REPORT OF THE PLANT PATHOLOGIST POP THE YEAR 1926. Bermuda Dept, 
Agr. Kept. 1925, pp. 35-41. [Abstract in Rev. Appl. Ent. (A) 16: 
17-18. 1928.] 
Some success was secured in combating a severe attack of 
Thrips tabaci Lind. (onion thrips) with two applications of 40 
percent nicotine sulphate at the rate of l/2 pt. to 50 gal. water 
with the addition of 2 lb. soap. No satisfactory results were secured 
with nicotine dust. 
MAUGHAN, F. B. (2487) 
1932. STUDIES OF THE ONION THRIPS. ' Jour. Econ. Ent. 25 (3): 662-670. 
[Abstract in Rev. Appl. Ent. (A) 20: 524. 1932.] 
In tests with various materials against Thrips t abaci Lind. , 
nicotine sprays and dusts .were in general most effective. 
(2488) 
1934. FURTHER STUDIES ON THE CONTROL OF THE ONION THRIPS. Jour Econ. 
Ent. 27: 109-112. 
A commercial nicotine dust was applied during the day time when 
the temperatures were 75° F. or higher. Although the plots treated 
with this dust gave a significant increase in bushels of onions per 
acre over the untreated plots, the cost of the material practically 
prohibits its use. 
WATSON, J, R. (2489) 
1922. REPORT OF ENTOMOLOGIST. Fla. Agr. Expt. Sta. Rept. 1921-1932, 
pp. 56R-59R. [Abstract in Rev. Appl. Ent. (A) 11: 503-504. 1923.] 
Results will more than repay the cost of nicotine sulphate in 
a combination spray when there are present as many as 10 thrips to 
a bloom. A dust composed of lime impregnated with nicotine sulphate 
will kill all thrips hit with it. 
KRYUKOVA, F. A. (2490) 
1932. COLLEkBOLA INJURIOUS TO VEGETABLES AND THEIR CONTROL. Bull. 
Leningrad Inst. Controll. Fm. For. Pests, No. 3, pp. 253-277, illus. 
[In Russian. Abstract in Rev. Appl. Ent. (A) 21: 122. 1933.] 
About 80 percent of sprouting rutabagas were injured by the 
springtail B ourletiel la hortohsis Fitch (pruinosa Tullb.). In experi- 
ments with insecticides, the percentages of mortality obtained were 78 
with a nicotine dust, 50 with a mixture of Paris green with ashes or 
tobacco dust, and 45 with tobacco dust alone. 
