6 
BULLETIN 1484, TJ. S. DEPARTMENT OF AGRICULTURE 
show severe symptoms of the disease. Definite spots of crazy-top 
occur less frequently in Pima than in upland cotton, the affected plants 
usually being more or less intermingled with normal plants.. The 
symptoms are also somewhat different in the two types of cotton, 
but there can be little doubt that the causal agency is the same. It 
<§ll 
O hi 
-a © 
o 
o 
o 
o 
o 
o 
^"0*0 
9 
9 
o 
o 
o 
o 
111 
o 
o 
o 
o 
o 
o 
o 
o 
£ © "° 
o 
o 
IHs 
o 
£<t 
o 
© "t- 
o 
"- m g 
o 
o 
a n w 
o 
o 
ili- 
o 
o 
ti | 
o 
o 
o 
o 
o 
o 
a s s 
2^g 
o 
3*3 
o 
o 
o 
°aZ% 
o 
o 
■B*Z 
o 
o 
o 
o 
'« ™ s 
o 
o 
o o C* 
o 
P.C.CV 
a 
o 
o 
o 
o. 
o 
o £ 2 
o 
o 
o 
•- £.c 
o 
o 
o 
o 
o 
o 
o 
o 
o 
o 
o 
o 
*?S"S 
o 
o 
o 
o 
o 
o 
5°<3 
o 
o 
o 
o 
o 
o 
o 
o 
o 
o 
o 
5^ >> 
o 
o 
o 
£.c a 
o 
o 
o 
o 
ce^ cs 
o 
o 
>o3 o 
o 
o 
o 
a Si 
o 
o 
o 
o 
o 
o 
o 
o 
o 
o 
o 
o 
o 
o 
o 
o 
V c3 a 
o 
o 
o 
N .S a 
o 
o 
o 
o 
o 
o 
o 
o 
o 

o 
o 

o 
o 
o 
o 
£ 
has been observed that chance Pima plants in affected spots of upland 
cotton show the characteristic abnormalities found in Pima fields, and 
chance upland plants in affected spots of Pima show the characteristic 
distortions of growth that occur in upland plantings. Figure 2 shows 
diagrammatically a diseased area having definite boundaries in a field 
