14 



BULLETIN 344, U. S. DEPARTMENT OP AGRICULTURE. 



The transfer of some of the weevils from cotton squares to cotton 

 bolls late in life seemed to have no effect upon their oviposition as 

 they continued ovipositing at about the same rate without a break. 



It is interesting to compare the data presented in this table with 

 the results secured by mating thurberiae on cotton squares in the 

 same manner at Victoria, Tex., in 1913. Table III gives this com- 

 parison. 



Table III. — Comparison of results securedin Arizona and Texas with regard to fecundity 

 of Anthonomus grandis thurberiae. 





Average 



oviposition 



period. 



Average 

 eggs per 

 female. 



Average 

 eggs per 

 female, 

 per day. 



Maximum 

 eggs per 

 female. 





Days. 

 32 

 45.1 



103.0 

 157.4 



3.2 

 3.4 



173 





309 







This table shows the greater fecundity of the variety under Arizona 

 conditions than under the unnatural environment of southern Texas, 

 although the daily rate of oviposition was much the same. 



WEEVILS FED ON COTTON BOLLS. 



Four pairs of hibernated thurberiae were removed from the cells 

 in Thurberia bolls and mated on cotton bolls in glass tumblers in the 

 same manner that others were mated on cotton squares. The results 

 secured from these are shown in Table IV. 



Table IV. 



-Fecundity of Anthonomus grandis thurberiae on cotton bolls, Agua Caliente 

 Ranch, Arizona, 1914- 



Source of weevils. 



Date 



first fed 



bolls. 



Date 



first egg. 



Period 

 fed 



bolls to 

 deposi- 

 tion. 



Date 

 last egg. 



Ovipo- 

 sition 

 period. 



Total 

 eggs. 



Av- 

 er- 

 age 

 eggs 

 per 

 day. 



Date 

 female 

 dead. 



Date 

 male 

 dead. 



Removed from cells in 



Thurberia bolls 



Do 



July 13 

 July 15 

 ...do 



July 20 

 July 19 

 ...do 



Davs. 



7 

 4 

 4 

 10 



Aug. 13 

 Aug. 10 

 Aug. 17 

 Oct. 14 



Days. 

 25 

 22 

 29 

 55 



7 



64 

 84 

 190 



0.3 

 2.9 

 2.9 

 3.4 



Aug. 24 

 Aug. 13 

 Aug. 30 

 Oct. 21 



July 19 

 Aug. 17 



Do... 





Do 



Aug. 11 



Aug. 21 









Total 



25 



6.2 

 10 



4 



131 

 32.7 

 55 

 22 



345 

 86.2 

 190 



7 















2.6 



3.4 



.3 











































From this table it is seen that the weevils displayed a comparatively 

 low degree of fecundity. This is seemingly in direct contradiction 

 to the results secured in the series of weevils on live plants in the 

 field and also of those offered a choice between cotton squares and 

 bolls. Quite a number of tests in glass tumblers were made during 

 the season to determine the preference displayed by the weevils iu 



