CONTROL OF BOLL WEEVIL IN MISSISSIPPI DELTA. 

 Table 12. — Square counts, Eureka plantation, Tallulah, La., 1916. 



15 





June 13. 



Aug. 11. 



Plat No. 



Number 

 of plants 

 exam- 

 ined. 



Number 



of squares 



found. 



Number 

 of squares 

 per plant. 



Number 

 of plants 

 exam- 

 ined. 



Number 



of squares 



found. 



Number 

 of squares 

 per plant. 



1 



50 

 50 

 50 

 50 

 50 

 50 

 50 

 50 



689 

 615 

 679 

 518 

 568 

 705 

 896 

 688 



13.8 

 12.3 

 13.6 

 10.4 

 11.4 

 14.1 

 17.9 

 13.7 



50 

 50 

 50 

 50 

 50 

 50 

 50 

 50 



167 

 672 

 709 

 504 

 827 

 894 

 367 

 1,107 



3.3 



2 



3 



13.4 

 14.2 



4 



10.1 



5 



16.5 



6 



17.9 



Check 1 



7.3 



Check 2 



22.1 







In the count of June 13 it was found that the plats were more or 

 less uniform, ranging from 10.4 to 17.9 squares per plant. At this 

 time check 1 averaged 17.9 squares per plant while check 2 averaged 

 13.7. Very different results were secured on August 11, when the de- 

 terminate growth factor had become operative and check 1, which 

 averaged above check 2 at the June 13 examination, averaged only 7.3 

 squares per plant, while check 2 averaged 22.1. In other words, the 

 plants in check 1 had practically matured as far as their square 

 formation was concerned, and were devoting themselves to ripening 

 their crop of fruit. However, although check 1 averaged only 7.3 

 squares, plat 1 fell far lower still, averaging 3.3 squares per plant. 

 Going to the other side of the experimental area, it is found that plat 

 6 averaged 17.9 squares per plant in comparison with 22.1 squares 

 per plant in check 2. This shows the difference due to the once-a- 

 week shakings. Owing to the soil variation it is difficult to compare 

 the middle plats with either of the checks, but considering these 

 outside records, which are strictly comparable, it seems obvious that 

 the shaking operation greatly reduced the number of squares per 

 plant, and on the whole the figures seem to warrant the conclusion 

 that this reduction of square formation was more or less directly pro- 

 portionate to the number of shakings which the plants received. 



SPACING OF PLANTS. 



In order to determine if the shaking operation had had any definite 

 effect on the stand remaining, the total number of plants in each plat 

 was counted on July 14. The figures secured are given in Table 13. 



