900 
Journal of Agricultural Research 
Vol. V, No. 19 
Table; IV .—Record of examination of insects for conidia of Cercospora personata — 
Continued 
Name of insect. 
Rate of 
collec¬ 
tion. 
Locality. 
Number of 
conidia of 
Cercospora 
personata. 
Other fungi. 
On 
body. 
In 
feces. 
Lady beetle (Me- 
Sept. 10 
Auburn, Ala. 
9 
0 
Qttta maculata). 
Grasshopper. 
18 
.do. 
6 
Several hundred 
conidia of Hel- 
minthosporium 
Ravenelii pres¬ 
ent. 
Katydid. 
18 
.do. 
92 
Grasshopper. 
18 
.do.... 
Many Fusarium 
sp. conidia. 
Few Alternaria sp. 
conidia. 
Puccinia cassipes 
B. and C., Hel- 
minthosporium 
Ravenelii. 
.do. 
20 
.do.. .. 
6 
.do.. .. 
Leaf hopper. 
20 
.do. 
8 
0 
Remarks. 
Two discharges. 
Over 500 spores of 
each estimated to 
be present in a sin¬ 
gle discharge. 
Grasshoppers were found to carry Cercospora personata conidia on 
their bodies and also to void them in their feces. The number of conidia 
to be found within and upon any individual insect depends naturally upon 
whether or not it has eaten diseased tissue within a short time prior to its 
capture. The largest number of conidia of C. personata found in a single 
fecal discharge of a grasshopper brought in from the field was 250. 
In order to ascertain whether or not feeding grasshoppers either avoid 
or select diseased leaf tissue, 13 were brought into the laboratory, where 
they could be closely observed and given diseased peanut leaves as food. 
Three of them seemed to prefer leafspot tissue, since they ate little ex¬ 
cept the affected tissue. The others were indifferent in their choice of 
food, but seemed not to avoid the diseased spots. The conidia in the 
discharges of some of these insects were too numerous to count. 
Passage through the alimentary canal of grasshoppers does not destroy 
the power of germination of the conidia of Cercospora personata . Conidia 
which had been voided were found to germinate within 12 to 18 hours 
when placed in drops of water. In fact, some were found to have already 
germinated at the time of discharge. When it is realized that these 
conidia-laden discharges are suitable situations for spore germination and 
a favorable pabulum for subsequent growth, and that they are commonly 
deposited upon leaves, it is seen that this is not an impossible means of 
causing infection. Since grasshoppers, which have notoriously strong 
powers of flight, were among the insects examined with positive results, 
they no doubt are potent agencies in the dissemination of leafspot for 
considerable distances. It is believed that the peculiar results in the 
tests on rotation and seed disinfection, as well as the correlation between 
the presence of leafspot and certain temperature and moisture conditions 
