. Behavior of cotton planted at different dates in weevil-control experiments in Texas and South Carolina. Boll weevil; Cotton; Cotton. 30 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
. Behavior of cotton planted at different dates in weevil-control experiments in Texas and South Carolina. Boll weevil; Cotton; Cotton. 30 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 larvae 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 were 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 3, 4, 6, 7, and 8 con- sisted of six rows, while plats 2, 5, and 9 had seven rows, the additional row being con- sidered as a guard, on account of being adjacent to a much earlier planting. Guard blocks 1 and 10 were also planted on each side of the field on April 5. The rows were 310 feet long and spaced 5 feet a
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