80 BULLETIN 1320, U. S. DEPARTMENT OF AGRICULTURE 
Heavy infestation from overwintered weevils is to be expected 
under normal conditions. The abundant protection afforded by native 
vegetation and the mild winters of the Sea Island sections afford 
excellent conditions for successful hibernation. Weevil emergence 
begins early, the first weevils usually being noted during April, 
feeding on the growing tips of the young cotton plants. The bulk of 
the cotton in this district is planted during the latter part of March, 
and squares begin to appear by the middle of May. 
During 1923 many fields in this section were heavily infested with 
weevils by June 10, while other fields farther away from favorable 
hibernation places showed very slight infestation. Hot dry weather 
during June caused high mortality of weevil larve in those fields where 
clean cultivation was practiced and the plants were still small, so that 
the sunlight could reach the shed squares. Although weevil infesta- 
tion was reduced by the natural control factors in June, the appear- 
ance of a new generation of weevils early in July caused infestation 
to increase gradually, so that in the fields where control measures 
oe not applied infestation was practically complete by the middle 
of July. 
COMPARISON OF SUCCESSIVE ADJACENT PLANTINGS AT 
CHARLESTON 
Four successive plantings, as shown in Figure 9, were made on 
James Island on April 5, 16, 25, and May 4, each planting being in 
, duplicate. The arrangement 
of the plantings was similar to 
those at San Antonio. Plats 
numbered 8, 4, 6, 7, and 8 con- 
sisted of six rows, while plats 
2, 5, and 9 had seven rows, 
‘ po aa 7iuN the additional row being con- 
Sy Ela it | sidered as a guard, on account 
Y ooo JAZ | TL TT of bemg adjacent to a, much 
\ [cee ealeaen eed earlier planting. Guard blocks 
. |_| ans 1 and 10 were also planted on 
: \\} each side of the field on April 
N PLANTED APR. E +: 5. The rows were 310 feet 
S Bh we eee re. 6 ON NY.  longand spacedsa.deetyapark 
ewe LAN ILD, Aeon S— 4 
| \ % The experiment was planted 
with seed of a very uniform 
strain of the Meade variety 
of Upland long-staple cotton. 
ee ere ae This variety has a staple 
Fic. 9.—Flowering record of successive plantings of length of 1% inches and is 
cotton on James Island, near Charleston, S. C., adapted for use on the South 
Ae ae aa ey oe Carolina Sea Islands. The 
seed was planted by hand in hills 12 inches apart. The cold 
dry weather of April delayed germination and caused a slow 
erowth of the ne cotton during the seedling stage. With 
higher air temperatures and adequate moisture in May, growth © 
became more rapid. The plants in each planting were thinned 
to two to the hill 12 inches apart when they reached a height © 
