Apr. 31.1933 Cultivated and Wild Hosts of Cane Mosaic 253 
'Table H.-^Compdsite record of the tests of the insect transmission of the grass mosaic — 
Continued 
Species. 
Num¬ 
ber of 
plants. 
Date exposed. 
Character. 
Insect. 
Results. 
Date 
examined. 
Conditicm. 
Synt^isma san~ 
iguinalis. 
Do.,..!. 
Miscanthus sinensis. 
Do... 
Brachiaria platy- 
hylla» 
Do. 
^Syntherisma sanff> 
uinalis. 
Do............; 
JPdspalum boscia- 
num. 
Do. 
Leptochloafiliformis. 
Do. 
Saccharum offichus- 
rum. 
Zea mays . 
Holcus sorghum .... 
'Cbix lachrytna-jobi.. 
Syntherisma sangu- 
i-mlis. 
.Miscanthus sinensis. 
Leptochloa filiformis . 
Saccharum officina- 
rum. 
.Holcus sorghum .... 
'Chaetochha lutes- 
cens, 
Syntherisma sangui- 
nalis. 
PasPalum boscia- 
num. 
Saccharum ojgicina- 
rum. 
Do.... 
JEchinochha crus- 
gain. 
Miscanthus sinensis 
zebrinq. 
Miscanthus sinensis 
variegota, 
Sorghastrum nutans 
ChaetQchloa magna. 
Paspalum boscia- 
num, 
'Chaetochloa magna.. 
Chaetochloa lutes- 
cens. 
Andropogon elliottii. 
Andropogon virgini- 
cus. 
Andropogon scopia-^ 
rus. 
Syntherisma sangui- 
nalis. 
Prachiaria platy- 
phylla. 
Panicum dichotomi- 
JtoTum. 
Sorghastrum nutans. 
Aug. 3,1930 
.do....... 
.....do....... 
.... .do.. 
July 13,1930 
.....do....... 
Aug. 16,1930 
Virulent.... 
Nonvirulent. 
Virulent.... 
Nonvirulent. 
Virulent.... 
DraeculacePh- 
ala molipes. 
.... do. 
.do.. ..... 
.do.. 
Aphis maidis. 
Sept. IS. 1930 
,... .do.. 
....do.. 
, ....do.. 
Aug. 13,1920 
Nonvirulent. 
Virulent.... 
....do. 
....do. 
Nonvirulent. 
Virulent.... 
.do. 
.do. 
.do. 
.do. 
_do..;.... 
Sept. 30 ,1930 
.do, 
.do. 
.....do. 
Aug. 17,1930 
.....do. 
Sept, 3,1930 
.do. 
.do. 
Oct. 1,1930 
Feb. 3, 1931 
.do. 
.do. 
.do. 
.do. 
.do. 
Apr. 7,1931 
Apr. 13 ,1931 
.do. 
.....do.. 
.do. 
May 25,1921 
.do. 
.do. 
.do. 
.do. 
Nonvirulent. 
Virulent.... 
Nonvirulent, 
Virulent.... 
,....do. 
,.. ..do. 
,....do....... 
_do. 
.do. 
.do. 
.do. 
.do. 
.do. 
.do.. 
.do. 
Draeculaceph- 
ala molipes. 
.do... 
.do. 
.do. 
.do. 
.do...... 
.do. 
Exposed on 
l^ge. ® 
.do. 
. .;..do. 
_do....... 
A phis maidis. 
....do. 
_do.. 
_do. 
Nov. 1,1930 
.....do....... 
-do. 
....do. 
-do. 
_do....... 
Nov. 18,1920 
Feb. 25,1921 
Apr, 2,1921 
....do. 
.do. 
.do. 
Viiulent.... 
Nonvirulent. 
Exposed on 
l^ge.« 
.....do...... 
Draeculaceph- 
ala molipes. 
.do. 
.do. 
....do.... 
_do_ 
Virulent.. 
.do.... 
.do_ 
.do. 
.do. 
, ....do.. 
, ....do. 
.do. 
.....do. 
.....do.__ 
.do_ 
.do_ 
.do_ 
.....do_ 
.do_ 
.do. 
.do. 
May 6,1921 
.do. 
May 35, 192 X 
Jime IS, 1931 
.do. 
Aphis maidis 
-do. 
.....do.. 
.do. 
.do. 
June 20, X921. 
.do. 
.do. 
.do 
.do 
.do. 
.do. 
....do.. 
....do. 
... .do.. 
_do. 
....do.. 
....do. 
_do___ 
_do. 
_do. 
....do.. 
All healthy. 
Do. 
Do. 
Do. 
5 mosaic. 
All healthy. 
Both mosaic. 
Both hesdthy; 
Both mosaic. 
Both healthy 
Healthy. 
Do, 
All healthy. 
Do. 
Do. 
Do. 
Do. 
Do. 
Do. 
9 mosaic. 
6 mosaic. 
3 mosaic. 
All healthy. 
6 mosaic. 
All healthy. 
Do. 
2 mosaic. 
Healthy. 
Do. 
All healthy. 
3 mosaic. 
4 mosaic. 
3 mosaic. 
All healthy. 
Do. 
Do. 
Do. 
3 mosaic. 
All healthy. 
3 mosaic. 
Both healthy. 
a These plants were merely exposed to natural infection by being placed on a ledge in a greenhouse 
■containing infected plants with which they were not in direct contact. ^ 
The percentage of plants infected in both artificial-inoculation and 
insect-transmission experiments is not high in many cases, but the 
results are conclusive owing to the conditions under which all experi¬ 
ments were performed. All grasses for experimental purposes were 
grown in a greenhouse at Washington hundreds of miles from any known 
