August, ’24] nickels: calcium arsenate dust for boll weevil 
479 
Thirty-eight plots received no treatment for weevil control prior to 
August 10th and only four plots developed sufficient infestation to re¬ 
quire control methods before that date. Some of the plots from which 
records are given in the above tables, were used as checks in sweetened 
poison and proprietary mixture tests. 
Table 3, is a record of the percentage of square or bud infestation of 
the calcium arsenate dust plots. 
Table 3. Square Infestation 
Plat 
No. 
July 
16 
24 
2 
7 
August 
15 
22 
29 
Sept. 
6 
1. 
7 
11 
5 
14 
33 
11 
17 
28 
1 Check. 
11 
8 
19 
19 
54 
79 
92 
100 
2. 
3 
1 
1 
1 
4 
6 
2 
5 
2 C. 
2 
1 
1 
7 
8 
25 
35 
71 
3. 
1 
6 
11 
19 
13 
43 
3 C.. 
4 
7 
13 
36 
52 
86 
4. 
4 
1 
0 
3 
7 
9 
11 
4 C.. 
5 
1 
0 
5 
6 
16 
42 
5. 
6 
2 
2 
14 
26 
13 
33 
5, 6 C. 
2 
3 
6 
20 
22 
15 
74 
6. 
1 
3 
4 
6 
11 
17 
27 
7. 
5 
3 
1 
2 
16 
5 
11 
25 
7 C. 
5 
6 
1 
12 
26 
30 
31 
100 
Records Made to Determine Uniformity of Plant Growth.— 
Methods developed by the Delta Laboratory of the Bureau of Ento¬ 
mology were used. Detailed records were made at frequent intervals, 
but those records are too voluminous to be given here. 
Poison Applications.' —Applications of poison were always made, 
when there was dew on the plants, usually between the hours of 4- 
7:30 A. M. Hand dusters and two row traction dusters were used in 
making applications. 
Table 4, gives the dates of poison applications, the quantity of 
poison used and the labor required. 
Table 4. Poison Applications 
Plat 
Date Applications 
Total Lbs. 
Total Hrs. 
No. 
July 
August 
Sept. 
Poison 
Labor 
1 
28 
3 11 15 21 25 31 
27.72 
4.7 
2 
13 20 25 
24. 
3. 
3 
10 15 21 25 29 
36.55 
5. 
4 
25 31 
5 11 
34.24 
3.85 
5 
20 25 30 
10 
25.84 
4. 
6 
20 25 30 
10 
23. 
4. 
7 
13 20 25 30 
25.88 
3.66 
Reduction in Square Infestation. —Results secured from the use 
