﻿STUDIES OF THE PINK BOLL.WOEM IN MEXICO 



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made in a number of representative plantations in the Lagmia. 

 In 1921 the comits were made in November and the first part of 

 December. In 1922 the counts in the unirrigated fields were made in 



Fig. 8.— Characteristic pink bollworrn fliun;ji!i', showing typo of bolls classed as "nonpickable" 



the latter part of September and the first part of October and those 

 in the irrigated fichis during the latter part of November. A frost 

 on October 30, 1921, killed all tlic cotton and consequently no green 



