﻿STUDIES OF THE PINK BOLLWOKM IN MEXICO 



17 



at that time little of the shedding of the young forms could be attrib- 

 uted to the pink boUworm. 



An experiment was conducted in another field in 1922, in which 

 both infested and uninfested freshly opened blooms were tagged and 

 kept under observation to determine the final percentage of the 

 forming bolls that was shed. Two kinds of infested blooms were 

 considered, those that on the day of opening contained mature larvae 

 and those that contained immature larvse. The blooms were tagged 

 on July 19 and 20. In Table 15 are given the results of this test. 



so 



C/^ji.y ^^/^. ^^y^TT 



Fig. 7.— Rclatioa of the inrestation of immature forms on the cotton plant to shedding 



Table 15. 



— Boll shed due to 



infestation 



of 



the bloom 







Kiml of bloom 









Number 

 tagged 



Per cent 



of bolls 



shed 



Uninfested 



200 

 200 

 200 



61 





93.1 





93.74 







The only difference noted during the experiment between the 

 shedding of the bolls of the two kinds of infested blooms was that 

 those of the last group in the table wore shed sooner than those of 

 the second group. The average of the last two (93.42 per cent) 



G0776— 26t 3 



