14 



PARASITES OF THE COTTON BOLL WEEVIL. 



squares, examined. A correct view of the monthly variation may be 

 obtained by an examination of the complete tables of observations, 

 which are given on succeeding pages. It will be noticed in that con- 

 nection that there is no graduated seasonal wave of parasitism. 

 Other and still unknown factors enter into the problem. 



The following summary also discloses the fact that hanging forms 

 provide conditions superior to those afforded by fallen forms, and 

 that squares are more favorable than bolls. 



Finally, it appears by comparison with the table of results for pre- 

 vious years that there has been a gain in the total percentage of 

 parasitism as well as in the two classes of forms. 



Table III. — Percentage of 'parasitism of lh< boll weevil, by months, in 1906. 





Fallen squares. 



Hanging 

 squares. 



Fallen bolls- 



Hanging 

 bolls. 



Total. 



Month. 



03 



0) 



1 



i 



8 





■j. 



© 



1 

 u 



- 

 © 



- 



© 



■i. 



s 

 — 



a 



c 

 © 

 © 



iges. 

 rasil(>s. 



— 



a 



8 



h0 



i. 



= 



8 









© 







© 







i 



- 



-_ 





- 



■~ 





CO 



PM 



Pm 



CO 



Ph 



Ph 



CO 



- 



- 



ffl - 



- 



00 



- 



- 



1906. 





























June 



3,831 



118 



3.08 



(«) ( a ) 



(«) 



(a) (a) 



(a) 



C) («) 



fa) 



3,831 



118 3.08 



July 



4,621 



210 



4.54 



247 76 



30.76 



L69 



0.00 



22 



0.00 



5,059 



286 5.65 



August 



10,342 



174 



1.68 



2,973 348 



11.70 



2,490 20 .80 



2, 925 



192 



6.54 



18, 730 



7:34 3.91 



September 



5, 665 



286 



5.04 



1,883 117 



6.26 



1,591 23 1.44 



1,140 



67 



5.87 



10,279 



493 4.79 



October 



347 



8 



2.30 



20 



0.00 



57 1 1.75 



860 



49 



5.69 



1,284 



58 4.51 



Entire season.. 



24,806 



796 



3.20 



5,123 



541 



10.56 



4,307 44 1.02 



i 



4,947 



308 



6.22 



39,183 



1,689 4.31 











i 



No 



record 



s mad 



e. 

















The observations for June were made only at Victoria; those for 

 October were made at Dallas for hanging forms and at Mineola for 

 fallen forms. 



Owing to the extensiveness of the tables the figures are consider- 

 ably condensed, but still retain the value of their records. Numerous 

 cases of high parasitism were found, of which the following may be 

 cited as notable examples: 



Number of Percent 

 stages, parasitized. 

 Fallen squares: 



Roosevelt, Tex. ,« September 24 



Brownsville, Tex./' September 5 1, 147 



Hanging squares: 



Waco, Tex., July 25 



Waco, Tex., September 20 



Cuero, Tex., August 31 



Fallen bolls: 



I !< irsicana, Tex., September 18 



Junction, Tex.. September 2 1 



Hanging bolls: 



Marshall. Tex., Augusl 22 



Trinity, Tex., August 9 



Waco, Tex., September 20 



69 



14.4 



147 



12.4 



99 



52.6 



L09 



23. S 



347 



21. 3 



\\\ 



5.9 



17 



5.8 



52 



13.5 



142 



12.0 



303 



11.8 



« In both of these localities fallen squares would naturally be dry. 



