COTTON IN WEEVIL-CONTROL EXPERIMENTS " 43 



was practically the same on cotton planted at San Antonio on April 19, 

 April 28, and "May 5. 



In the first half of July at San Antonio a larger number of squares 

 was injured by weevils on the first planting, while during the latter 

 part of July the number of weevil-damaged squares rapidly increased 

 in the later planted cotton. This increase was due to the presence 

 of many young squares on the later planted cotton, while the forma- 

 tion of squares on the early-planted cotton had almost ceased. 



No shedding of weevil-infested squares occurred in the separate 

 planting of May 12 at San Antonio until July 11, after flowering had 

 started. The weevil injury to squares in this planting was much 

 less than in the successive plantings (fig. 8) . 



Also there was a larger amount of injury to bolls of the later 

 successive plantings which had a larger percentage of young bolls 

 during the latter part of July. (Table 11.) The damage to bolls in 

 the separate planting made on May 12 was less than occurred in 

 the successive plantings. 



The early-planted cotton yielded more than the later planted 

 cotton in the successive plantings at San Antonio, but the last planting 

 had a very poor stand in addition to greater weevil injury to bolls. 

 (Table 12; fig. 7.) 



The yields of the separate late planting on May 12 nearly equaled 

 the yield of the first of the successive plantings on April 19 and ex- 

 ceeded the yields of the second and third plantings on April 28 and 

 May 5. (Tables 16 and 17; fig. 7.) 



The highest total yields at Charleston were produced by early- 

 planted cotton, but with a wide variation of soil conditions in different 

 parts of the field. Comparison of yields from a uniform part of the 

 field showed only slight differences in the yields of the early and late 

 plantings. (Table 28; fig. 10.) 



Considering the variations that appeared in the results of the 

 experiments and the fact that the later rows of the successive plantings 

 were only partially protected against weevils from the earlier rows, 

 the experiments do not show that later planting is impracticable 

 either m Texas or South Carolina. From the nature of the problem 

 a wide range of seasonal and soil conditions must be tested before a 

 general advantage can be demonstrated. 



