May 24,1924 
Acromania, or “ Crazy-Top” 
819 ? 
Table I.— Comparison of seeds per boll from crazy-top and normal plants at the- 
United States Field Station , Sacaton, Ariz1923 
Bolls from “crazy-top" Pima plants 
Top crop bolls 
Middle crop bolls 
Plant No. 
Good 
seeds 
Aborted 
seeds 
Total 
ovules 
Good | 
seeds 
Aborted 
seeds 
Total 1 
ovules 
1_ 
18 
0 
18 
18 
1 
19 
2... 
12 
5 
17 
16 
5 
21 
3...... 
9 
11 
20 
14 
5 
19 
4.. 
9 
10 
19 
14 
7 
21 
5_ 
16 
2 
18 
18 
3 
21 
6_ 
10 
6 
16 
15 
6 
21 
7_ 
10 
9 
19. 
17 
3 
20 
8.. 
9 
8 
17 
13 
7 
20 
9... 
9 
11 
20 
17 
3 
20 
10_ 
9 
6 
15 
12 
11 
23 
11.. 
15 
3 
18 
23 
0 
23 
12_ 
7 
11 
18 
13 
4 
17 
13_ 
11 
4 
15 
17 
2 
19 
14_ 
11 
6 
17 
10 
10 
20 
15_ 
11 
8 
19 
11 
8 
19 
16_ 
14 
3 
17 
15 
4 
19 
17... 
14 
4 
18 
17 
4 
21 
18_ 
13 
7 
20 
19 
3 
22 
19.. 
15 
3 
18 
15 
3 
18 
20_ 
14 
4 
18 
15 
5 
20 
21_ 
6 
10 
16 
20 
4 
24 
22_ 
11 
7 
18 
18 
5 
23 
23...... 
13 
3 
16 
19 
0 
19 
24_ 
11 
5 
16 
* 15 
6 
21 
25_ 
8 
10 
18 
15 
6 
21 
Total_ 
285 
156 
441 
396 
115 
511 
Average. 
11.4 
6.24 
17.64 
15.84 
4.6 
20.44 
Bolls from normal Pima plants 
Plant No. 
1_ 
2_ 
3_ 
4.. .. 
5 _ 
6 _ 
7_ 
8 .. ... 
9 _ 
10 _ 
11_ 
12___ 
13_ 
14.. .. 
15.. ... 
16_ 
17_ 
18... 
19 _ 
20 _ 
21_ 
22_ 
23 _ 
24 _ 
25 ... 
Total. __ 
Average. 
Top crop bolls 
Middle crop bolls 
Good 
seeds 
Aborted 
seeds 
Total 
ovules 
Good 
seeds 
Aborted 
seeds 
Total 
ovules 
8 
10 
18 
19 
2 
21 
19 
2 
21 
21 
0 
21 
20 
1 
21 
19 
2 
21 
17 
1 
18 
20 
0 
2G 
19 
2 
21 
18 
3 
21 
15 
3 
18 
19 
2 
21 
19 
2 
21 
17 
3 
20 
15 
1 
16 
20 
1 
21 
19 
0 
19 
20 
0 
20 
19 
2 
21 
17 
2 
19 
9 
10 
19 
18 
2 
20 
14 
2 
16 
19 
2 
21 
17 
4 
21 
16 
4 
20 
18 
4 
22 
18 
3 
21 
16 
2 
18 
16 
4 
20 
19 
2 
21 
21 
1 
22 
11 
6 
17 
19 
2 
21 
15 
6 
21 
19 
1 
20 
21 
0 
21 
14 
7 
21 
19 
2 
21 
18 
4 
22 
7 
12 
19 
19 
2 
21 
15 
6 
21 
17 
4 
21 
19 
2 
21 
19 
2 
21 
20 
0 
20 
19 
2 
21 
19 
2 
21 
17 
2 
19 
409 
84 
493 
459 
58 
517 
16.36 
3. 36 
19.72 
18.36 
2.32 
20. 68 
IRREGULAR OCCURRENCE OF CRAZY-TOP 
The occurrence of crazy-top in the fields is as irregular as could well be imagined. 
Though a general tendency to appear in spots must be recognized, the margins 
of the spots are not definite, but show affected and normal individuals mixed 
indiscriminately in the rows. Isolated crazy-top plants may be widely scattered 
or in small open groups with normal individuals between. Striking contrasts 
appear between adjoining rows, when many plants in one row are affected with 
crazy-top and the next row is entirely free from the disorder. 
If the soil or the cultural conditions were responsible for inducing the disease, 
more definite spots would be expected, with the marginal plants of the larger 
spots showing a series of gradations in the extent of reduction and deformity of 
the plants. Also some relation would be expected between the occurrence of 
the disease and the general growth conditions that determine the general size 
and vigor of the plants. But such relations are conspicuously absent. The 
occurrence of the disorder includes a very wide range of soil conditions, and 
plants of all sizes and degrees of vegetative vigor are affected. 
The fact that badly affected individuals are so often scattered indiscriminately 
among plants that have continued the normal habits of growth through the 
season is also adverse to the idea of a resident cause of the injury located in 
the soil. It may be inferred from the failure to spread that the cause of the 
disorder, or the agency of distribution, operates in a very sporadic and temporary 
manner. Otherwise the infection would not remain scattered or sporadic but 
would be complete and continuous by the end of the season as was the case with 
