INJURIOUS INSECTS OF I909 AND IQIO. 
wn 
Ut 
Treated, 21 free from infestation, 13 marked by maggots. 
Checks, in another row, 2 free, 35 marked. 
Another check row, with an equal number of plants when set 
out, gave a count of 7 free, and 31 marked, which shows consid- 
erable evidence in favor of this treatment with carbolic acid emul- 
sion. 
Tobacco Dust. 
On June 22d a row containing 37 plants of cauliflowers was 
set out. All the plants in this row were treated with tobacco dust, 
sifted around the stems as soon as set out, and again in a similar 
way on July 13th. On August 26th these plants were pulled up and 
examined, with results as follows: 
PRE GALCO peat gers foo teinacts 14 free from infestation, 2 marked. 
A check row containing same number of plants gave a count of 
7 free, and 31 marked, showing much evidence in favor of the 
treatment. 
EXPERIMENTS WITH THE CABBAGE MAGGOT ON 
RADISHES, 1909. 
The following experiments with the cabbage maggot on radishes 
indicate that hellebore decoction is useful as a deterrent. (See p. 55). 
Also carbolic acid emulsion, p. 56; and not only that the tobacco 
dust treatment is a good. preventive, but that tobacco is a fine fertil- 
izer for radishes, ». 57. Air-slaked lime injures radishes if applied 
liberally, see p. 57. 
Radishes were planted on May 31st, in plots on the Station 
grounds as follows: Plot 1 contained 16 rows; plots 2 and 3 
contained 14 rows each; plots 4 and 5 contained 15 rows each. 
Each row was 12 feet in length. Plot 4 was reserved as a check on 
the others. When the radishes began to show above ground, on 
June 3d, those in Plot 1 were treated, on June 8th, with hellebore 
decoction (see Twelfth Report of the Minnesota State Entomologist, 
Page 136, for the formula) ; the radishes at this time being one and 
a half inches high. Hellebore decoction was applied with a sprink- 
ling can, without the rose, along the rows. The ground around 
the radishes was thoroughly moistened with the decoction. This 
plot was treated again on June 15th, a third time on June roth, a 
fourth time on June 24th, and a fifth time on July 3d, after some 
of the radishes had been pulled and counted. 
