THE SUGAR-CANE MOTH BORER. 
31 
when the cane is cut, as the infestation increases up to this time and 
as the examinations necessitate the removal of the leaves from the 
stalk— a rather undesirable proceeding when the plant has still to 
make considerable growth. The plan adopted has been to examine 
at least 100 stalks in a field, sometimes many more. The uninfested 
and the infested stalks in these groups have been counted, and the 
percentage of infestation is determined from the data thus Obtained. 
In actual practice this procedure has been modified. The number 
of fields examined in one vicinity seldom has been less than four, 
and often many more, depending upon the amount of time at the 
disposal of the inspector. 
The infestation by the moth borer has been rather accurately 
determined year by year for the six years 1912 to 1917, inclusive, 
but the prevalence of other insect pests, which are not so important, 
has been only estimated. 
To facilitate the inspections a card form was devised, which is 
reproduced here. 
Form of card for field notes. 
Sugar-cane Status, 191 — State 
Locality Date 
. . . Plantation 
. . . Parish or county 
Group 
examinations. 
1 
2 
3 
4 
5 
Total. 
Per 
cent. 
Owner, 
Location of field, 
Stalks. 
Year of crop, 
Clean, 
Variety, Soil, 
Diatraea, 
Cultivation, 
Sugar-cane condition, 
Joints, 
Stalks cut? 
Stalks standing? Trash burned? 
Clean, 
Aphis, Weevil, 
Diatraea, 
Lachnosterna, Ligyrus,i 
Ants, Pseudococcus, 
Remarks: 
Sugar-cane diseases, 
>> 
1 
o 
Environment, 
'A 
1 Ligyrus= Euethcola rugiceps Le Conte. 
AVEEAGE ANNUAL INFESTATION IN LOUISIANA. 
Observations have been made annually from 1912 to 1917, inclu- 
sive, on the infestation of from 6 to 13 localities in the borer-infested 
area of the Louisiana sugar-cane belt, with the result that the aver- 
