CONTROL OF BOLL WEEVIL IN MISSISSIPPI DELTA. 



11 



Table 8. — Total forms collected from picked plats and checks during final 3 weeks, Eureka 

 plantation, Tallulah, La., 1916. 





Forms collected. 



Mode of collection. 



Plat 1. 



Plat 2. 



Plat 3. 



Plat 4. 



Plat 5. 



Plat 6. 



Average, 



both 

 checks. 



In bags 



3,935 

 3,958 



4,369 

 6,029 



4,027 

 5,852 



2,847 

 6,182 



2,146 

 6,923 



1,442 

 13,235 







11,673 





Total 



7,893 



10,398 



9,879 



9,029 



9,069 



14, 677 



11,673 







In Table 7 it is seen that the total for the picked plats ranged from 

 13,791 for plat 1 to 21,570 for plat 6. However, if plat 6 is excluded, 

 the totals are more or less approximate. 



In Table 8 it is seen that for the last three weeks the totals ranged 

 from 7,893 for plat 1 to 14,677 for plat 6. All plats totaled less than the 

 average check except plat 6, which was 3 ,004 above check. Here again 

 the soil gradation probably distorts the results somewhat, and in 

 considering all late season results it should be remembered that the 

 soil graded lighter from east to west and the fruiting became more 

 determinate, so that the figures for the various plats can not be 

 accepted absolutely at their face value. Another factor operating 

 at this time was the effect of the shakings on plant development. 

 This will be dealt with in detail later in the present report. 



WEEVIL INVESTATION. 



Although the plats were so small that they could not represent, or 

 even approximate, an actual test of weevil control under field condi- 

 tions, the progress of the infestation was still followed very carefully 

 throughout the season. This record was determined for each plat by 

 examining 100 squares at each end and the middle of the two inside 

 rows of the plat. This made a total of 300 squares for each plat and 

 the percentage of these which had been weevil injured was noted. 

 These records were made about once a week during the season. The 

 detailed results secured are shown in Table 9. 



Table 9. — Weevil infestation, Eureka plantation, Tallulah, La., 1916. 



Date. 



Plat 1. 



Plat 2. 



Plat 3. 



Plat 4. 



Plat 5. 



Plat 6. 



Check 1. 



Check 2. 



June 16 



8.0 



3.3 



6.6 



12.7 



7.6 



21.0 



71.3 



90.0 



85.3 



93.3 



15.0 



5.6 



4.6 



11.7 



6.6 



22.0 



64.7 



83.0 



85.7 



94.3 



6.3 



4.6 



6.6 



11.3 



4.6 



20.3 



64.7 



91.0 



86.7 



94.7 



4.6 



6.6 



5.3 



5.3 



12.6 



23.0 



68.7 



94.0 



89.7 



97.7 



0.6 



4.0 



5.3 



6.7 



19.0 



50.3 



71.3 



93.3 



91.3 



97.0 



2.6 

 5.3 

 7.0 

 11.3 

 25.0 

 47.3 

 76.7 

 90.3 

 88.3 

 97.0 



9.6 

 3.3 

 14.0 

 16.0 

 28.6 

 57.0 

 92.0 

 95.7 

 97.3 

 97.7 



4.3 



June 20 



5.0 



June 27 



10.6 



July 4 



13.3 



July 11 



24.6 



July 19 



42.6 



July 26.... 



84.3 



Aug. 2 



94.0 



Aug. 9 



94.3 



Aug. 15 



97.0 







Average of each plat 



39.9 



39.5 



38.9 



40.7 



43.9 



45.1 



51.1 



47.0 







