16 BULLETIN 1320, U. S. DEPARTMENT OF AGRICULTURE 
SHEDDING OF SQUARES FROM WEEVIL INJURY 
As previously stated, the first indication of weevil infestation after 
the removal of squares and the application of poison was noted 
during the last week in June. The progress of the infestation is 
shown by records of weevil damage during the period from June 25 
to July 31. These records were obtained by counting the number 
of weevil-punctured squares that were shed during 2-day intervals 
from a 50-foot section of a row in each block of each planting. These 
data are graphically shown in Figure 6, the total number of shed 
squares from the two blocks in each planting being combined in each 
curve. : 
FOO 
i Ss a A A GO fee) CS ae) 
ol | | Es Re ee eee 
et 
po ey Bee 
GO 
uy #0 Oo) —— YLIWVIED APRIL 19 BRB Re ay 
ea ea | 
i 2O-— > —— — ALANTED APRIL 28 | Prsise 
OE ae ae sal 
S Yo | —-— LANTLD (AR EF === 
8200 aleeeee. coo ALANTED (IY 12 eee ass An 
Sie Ss Hed BE 98 2 
ee 4 ee ae ee a ae a ee Ss a 
Si A a a ES RE a 
7 NP a [a2] 3) Slee eee 
ES RS ae a a | Fr Hoe ed ee 
C FO} Re: 
ses MD EO a Cea 
Pe cr oak RS Es Ge Be eS EB 
S 7 oa Ws ae oo se Poa BaD gio da55 
age ES eae DP TE RE St fs 
pe MR a BR a an LS ed sa EP 
S l | | i ie | 
SCs ro Bi BE | as ea Fe ee Se) A Sr 
ef eS Are SRE; al eS Pee 
27 29 /f 3 & F GU 13 IE AP 192 2325 27 2G 
Se a 
JUNE SLE 
Fic. 6.—Number of weevil-shed squares from two 50-foot sections of rows in each planting of cotton at San 
Antonio, Tex. 
The first weevil-shed squares in the April 19 planting were found 
on June 29 and in each of the three later plantings by July 7. The 
first planting showed a higher rate of square shedding during the first 
half of July, but the extent of weevil damage in all plantings was 
ractically the same by the 19th of that month. The number of 
squares shed from the first planting decreased after this date, but 
increased very rapidly in each of the later plantings. 
This abrupt shift in the extent of shedding is due to the fact that 
there were more squares on plants in the later plantings during the 
last half of July. It is probable that the absence of squares on the 
early plants resulted in a concentration of weevils on the later plant- 
ings. This condition of heavy weevil infestation in the late-planted 
