71 



Injury to ripe peaches still attached to the trees is recorded by 

 Webster'' in Ohio. Bollworms attack peaches about as they do 

 tomatoes (see PL XI, fig. 3). 



Peas, beans, and okra are all bored into and the green seeds eaten, 

 the bollworms often being very destructive to these plants (see PI. XI, 

 figs. 4 and 5). 



From eggs laid on rosebuds early in the spring a lot of larvte feed- 

 ing upon the unopened buds were reared. 



CHOICE OF FOOD BY LARV^ 



Aside from field observations, a series of experiments were made in 

 the laboratory to determine the choice of food by larvae when plenti- 

 fully supplied with several kinds. When given corn, cotton squares, 

 green tomatoes, and tobacco buds, the corn is ahnost always chosen, 

 often after first tasting the others; but with different parts of the corn 

 plant selection is not always so uniform. Apparently the tender bud 

 and ear are about equally attractive. In the case of cotton the flowers 

 and squares were liked best, as is shown in the appended table. 



Table XXIII. — Choice of different parts of King cotton by bollworms. 





Number of larvae. 



' 





First series. 



Second series. 



Total. 





Part of plant. 





>> 



. 



>» 







^ 





>. 





>» 





^- 



>. 



rr 



1 



Remarks. 







c3 



>. 



3J 



& 



>. 



T! 





<s 



>> 



OS 





T) 



Gi 



a> 









>. 



-O 



aJ 



-o 



<a 



5 



>j 



-o 



Cj 



-o 



S"! S* 



^ 



■O 



•T\ 











'C 



-a 



Si 



n 



-d 





-« 



-d 



.a 



5 -o 



x: 



?r 



'73 







c 

 o 





1 



A 



^ 

 "S 



> 



1 



o 



2 



o 



5 







be 



t 



PI 







fe 



w 



^ 



\^ 



^ 



cc 



02 ^ 



03 IH 



|i< 



t^ 



OQ 



OQ 



w 



\^ 



02 





Leaves 



9 



8 



7. 



^ 















1 







n 







1 















8 



9 



Fifth choice. 



Tender growth 



2 



2 



1 



4 



2 











1 



4 



2 



S 1 















11 



8 



Fourth choice. 



Flowers 



('0 



{a\ 



(«) 



(a) 



(a) 



(«) 



(a) 



4 



fi 



? 



4 



8 



3 



4 



3 



i») 



?9 



First choice. 



Squares 



<\ 



S 



•^' 



•^' 



\ 



•> 



9 







1 



^ 



9 



'> 







1 



0^ 



14 



Second choice 



Bolls 



1 



1 



3 











2 



4 















2 



3 



2 



1 



3 



11 



11 



Third choice. 







a Absent. 



The experiments from which these data were obtained were made 

 by placing leaves, squares, etc., together under a large bell jar with 

 the larvae. Then every day an examination was made and the part 

 chosen by each larva recorded. No doubt if the experiments had been 

 tried in the open sunlight, the exposed tender growth would not have 

 been chosen so frequently. 



RELATIVE ATTRACTIVENESS OF UPLAND AND EGYPTIAN COTTONS. 



It was noticed quite frequently that Egyptian cotton was more or 

 less free from attack by the bollw^orm, while Upland cotton growing 

 adjacent was badl}^ infested. To get accurate data on this point a 



^'Bul. No. 8, n. s., Div. Ent., U. S. Dept. Agr., p. 41. 



