98 
JOURNAL OF ECONOMIC ENTOMOLOGY 
[Vol. 17 
two-thirds grown. From this time on a considerable proportion of these 
remained distinctly dwarfed, and the difference between the screened 
plants and those grown in the open was more marked than is indicated 
by the counts. Many of the plants were dwarfed as a result of early 
infection, altho showing no well defined lesions at the time of transplant¬ 
ing. 
The experiment recorded in Table 2 was one of a series carried out to 
determine the value of successive applications of mercuric chloride in 
Table 2. Relation of Time and Number of Applications of Mercuric Chloride 
Solution to Maggot Control and to the Development of Rhizoctonia in 
Cabbage Seed-Beds (Mercuric chloride used at rate of 1 ounce 
TO 10 GALLONS WATER) 
Plat 
Row 
Number of Date of 
applications final 
per row application 
Number of 
plants 
counted 
Percentage 
injured 
by maggot 
Percentage 
diseased 
- 1 
1 
1 
5-25 
188 
22.34 
4.25 
1 
2 
2 
6-1 
172 
3.48 
4.27 
1 
3 
3 
6-9 
188 
0.00 
0.00 
1 
4 
4 
6-16 
170 
0.00 
0.58 
1 
5 
5 
6-23 
190 
0.00 
0.00 
2 
6 
1 
6-1 
216 
15.27 
9.72 
2 
7 
2 
6-9 
206 
6.79 
2.91 
2 
8 
3 
6-16 
219 
5.47 
4.11 
2 
9 
4 
6-23 
215 
4.18 
1.39 
3 
10 
1 
6-9 
189 
47.61 
5.29 
3 
11 
2 
6-16 
176 
41.47 
9.09 
3 
12 
3 
6-23 
232 
37.93 
13.36 
4 
13 
1 
6-16 
246 
73.57 
12.60 
4 
14 
2 
6-23 
234 
55.98 
4.27 
5 
15 
1 
6-23 
277 
66.06 
9.02 
Check 
No treatment 
732 
66.66 
15.84 
checking the development of Rhizoctonia in the seed-bed and needs but 
little explanation. The various plats were arranged and the different 
applications timed to give data bearing on the problem from as many 
different angles as possible. 
Of the five applications to be put on at weekly intervals, the first was 
made one week after the plants commenced to appear thru the ground 
and included all five rows of Plat 1. The second application included the 
first and second plats except that Row 1 was omitted from Plat 1. 
In the case of the third application Plats 1, 2 and 3 were treated with the 
exception of Rows 1 and 2 of Plat 1 and Row 1 of Plat 2 which were 
