30 BULLETIN 1374, IT. S. DEPARTMENT OF AGRICULTURE 
Table 23. — Infestation of plantings in 1921 alisiance-of-fiigkt tests 
Dis- 
tance 
from 
fields 
Date first bloom 
Date found infested 
Larvae per group of plants- 
Date 
plants 
Point 
First 
instar 
Second 
instar 
Third 
instar 
Fourth 
instar 
Total 
were 
de- 
stroyed 
No. 1 
Miles 
1 
2 
3 
4 
5 
6 
7 
8 
July 19 to 28 
July 13 
Aug. 25 ... 
8 
2 
\ 
„ 
1 
1 
9 
4 
1 
3 
6 
Aug. 30 
Sept. 22 
Sept. 18 
Sept. 7 
Sept. 8 
Oct 14 
No. 2 
Sept. 22... 
No. 3 
Aug. 18 to 25 
do 
Sept. 15 
No. 4 
Sept. 1 
No. 5 
Sept. 1 to 7 
July 28 to Aug. 4.. 
Aug. 18 to 25 
July 6 to 13 
Sept. 7 
2 
1 
No. 6 
Oct. 14 
6 
1 
2 
No. 7 
Sept. 7 
1 
Sept. 8 
Oet. 2 
No. 8 
July28andSept.29 
2 
All the groups of plants became infested, No. 8, which was 8 miles 
from the nearest cotton field, being the first. As only one small 
larva was found in this instance it was removed ; but the plants were 
not destroyed. Close examinations showed that there was no con- 
nection between this infestation and the later one in this group of 
plants. In all other cases the plants were removed soon after the 
infestation was discovered, and all forms closely examined, with the 
results given in the table. Each group of plants in this test became 
infested independently of the others, with the nearest source of infes- 
tation as indicated in the table. Whether the moth reached any or 
all of the points by flight or through carriage by man can not be 
explained. There was no occasion of infested material being carried 
past these plantings but the moth may have been carried out in mak- 
ing inspections or by carts which occasionally passed near by. Still, 
with millions of moths in the fields, it would not seem strange had 
some of them been carried to these plantings by favorable winds, 
even though their power of flight is limited. 
The following season (1922) plantings of small groups of plants 
were made in several directions from the source of infestation. Table 
24 shows the arrangement of these plantings and the results obtained. 
Table 24. — Results in distance-of-flight plantings, Tlahualilo, 1922 
Point 
Distance 
from ! Direction 
cotton 
Infestation 
Remarks 
No. 1 
Miles 
5 
8 
North 
No. 2 
No. 3 
5 
8 
5 
6 
West 
Early 
No. 4 
do 
No fruit formed. 
No. 5 
East 
..do 
Do. 
No. 6 
do 
do 
Do. 
With the exception of the failure of the plants at point No. 1 to 
become infested, the results are about the same as in 1921. 
In addition, two other plantings were made in 1922, one 25 miles 
northwest and the other 40 miles west of the nearest cotton in the 
Laguna district. These plantings were on cattle ranches and con- 
sisted of about 100 plants each. The first showed as heavy an 
infestation at the end of August as the average for the Tlahualilo 
