258 
Journal of Agricultural Research 
Vol. XXIV. No. 3 
Tabi^b VII .—Weight of healthy and mosaic ears of corn varieties planted May 15, ig2Z 
Variety. 
Source of seed. 
Native. 
Georgia. 
Do ... 
Pope Prolific. 
Plorida. 
"Do... 
. .. .do. 
TJ. S* Selection No. 165.. 
Do. 
Texas. 
XJ. S. Selection No. 170.. 
Do.... 
.do. 
.do. 
Laguna.. 
Do. ... 
.do. 
Brazos... 
Do. 
.do. 
Arlington Prolific. 
Mijv‘?i 5 ?sippi. 
Do. ..... 
.do. 
Red Cob. 
Do. 
.do. 
Millpond Prolific. 
Georgia. 
Do. 
Whatley Prolific.. 
Do. 
.... do . 
Gerrick. 
South Carolina. 
.... do. 
Do. 
XJ. S. Election No. 201.. 
Do. 
Arkansas. 
.do. 
Cuban Yellow... 
Florida. 
Do. 
.do. 
Station Yellow. 
Alabama. 
Do.. 
.do. 
Singleton. 
Texas. 
Do. . .. 
do. 
XJ. S. Selection No. 230.. 
Do. ... 
Virginia. 
.do. 
Boone County (XJ. S. 
Selection No. 119).... 
Do.... 
.do.. 
.do. 
Condition. 
Ears 
Weight. 
Decrease 
- due to 
mosaic. 
on zo 
plants. 
Total. 
Average 
Healthy. 
Number. 
S 
Gm. 
535 
Gm. 
107 
Per cent. 
Mosaic... 
7 
470 
67. I 
37-3 
Healthy. 
8 
822 
102. 7 
Mosaic... 
5 
402 
80. 4 
21.8 
Healthy, 
4 
665 
166. 2 
Mosaic,.. 
9 
780 
82. 2 
50.6 
Healthy. 
6 
995 
165.8 
Mosaic... 
6 
830 
138.3 
16.6 
Healthy. 
5 
765 
153-0 
Mosaic... 
5 
735 
147.0 
4.0 
Healthy. 
6 
1,115 
815 
186. 0 
Mosaic... 
7 
116. 4 
37-5 
Healthy. 
10 
I, 100 
no. 0 
Mosaic... 
6 
470 
78. 2 
29. 0 
Healthy. 
4 
555 
138-7 
Mosaic... 
5 
640 
128. 0 
7-8 
Healthy. 
7 
750 
107. I 
Mosaic... 
10 
595 
59-5 
44-5 
Healthy. 
7 
790 
112. 8 
Mosaic... 
II 
880 
80. 0 
29. I 
Healthy. 
7 
580 
82. 9 
Mosaic... 
12 
890 
74. I 
20. 7 
Healthy. 
8 
910 
II 3-5 
Mosaic... 
6 
518 
86.3 
24. 0 
Healthy. 
5 
81S 
163.0 
Mosaic... 
12 
1,140 
9 S -0 
41. 8 
Healthy. 
8 
900 
II 2 . 2 
Mosaic... 
8 
7 SS 
94-3 
16. 0 
Healthy. 
7 
784 
112. 0 
Mosaic... 
6 
670 
III. 6 
•4 
Healthy. 
2 
318 
159.0 
Mosaic... 
3 
317 
102.3 
35-7 
Healthy. 
2 
205 
102. s 
Mosaic... 
6 
435 
72.5 
29-3 
This data indicates that with corn, as with sugar cane, some susceptible 
varieties tolerate the disease without greatly injurious results, while 
other varieties are severely injured by it. Plate i, B, illustrates a variety 
not noticeably injured by mosaic. It was pointed out in a former 
publication (4) that in the case of '‘White Creole” corn in Louisiana the 
ears of affected plants are not only stunted but they are poorly filled, 
some being quite sterile. The rows of kernels in affected ears are likely 
to be very irregular as compared with the straight parallel rows of normal 
ears. In nearly all varieties in the present experiments the same condi¬ 
tion was apparent and is well illustrated in Plate i. A, and also in Plates 
2 to 4. It will be noticed that some of the ears marked “healthy” are 
small and some show irregularity in the rows, but by no means to the 
same degree as in the mosaic ears. This may be due partly to the fact 
previously noted that plants labeled healthy in the field may have become 
infected later. The writers believe that grass mosaic is a serious disease 
of com where conditions are favorable for infection. Since the disease is 
apparently not transmitted in the corn seed, as will oe briefly considered 
