8 BULLETIN 1374, TJ. S. DEPARTMENT OF AGRICULTURE 
stages being found immediately under the plants and only 32.9 per 
cent between the rows. 
Table 5. — Total larvse, pupse, and pupal cases found in the soil immediately under 
the row and between the rows 
Date 
Under [ Between 
the row ; the rows 
1921 
Aug. 19 
Sept. 6 - 
25 
Oct. 18. — 
29 
1922 
Mar. 23 
Do 
Do 
Do 
Do 
Total 
Percentage of total 
60 
55 
69 
11 
18 1 
6 
33 
10 
9 ; 
10 
18 ! 
1 
28 , 
16 
27 
19 
6 
4 
13 
6 
281 
138 
67.1 ' 
32.9 
RE STING-STAGE LARV.E IN THE SOIL 
Not only does the larva of the pink bollworm, in the Laguna dis- 
trict, go to the soil during the summer for transformation into the 
Fig. 4. — Cocoons spun by the pink bollworm in the soil. Top row shows t^pe of summer cocoons and 
bottom row type of winter cocoons 
adult, but to a certain extent it also passes the winter there in the 
resting stage. The summer larva, after entering the soil, spins a 
light oblong cocoon in which it pupates. Later, in the fall, some 
cocoons of a much heavier texture and more spherical in form are 
noticed in the soil (fig. 4). In these the larvse are found in the same 
characteristic curled-up position that they assume on passing the 
winter in double seeds. Observations have shown that when dis- 
turbed, unless it is unusually cold, the larva readily leaves this cocoon. 
In Tables 6 and 7 are given the results of all the soil examinations 
made in 1921 and 1922 cotton fields. The maximum number of 
living stages found at any time is shown in the second examination of 
1921 when a total of 83 living larvse and pupae were found in 1 square 
yard of soil. This sample was taken from a heavily infested field of 
very large cotton on loose sandy soil. 
