STUDIES OF THE PINK BOLLWORM IN MEXICO 
17 
at that time little of the shedding of the young forms could be attrib- 
uted to the pink bollworm. 
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 larvae. The blooms were tagged 
on July 19 and 20. In Table 15 are given the results of this test. 
so 
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Fig. 7.— Relation of the infestation of immature forms on the cotton plant to shedding 
Table 15. — Boll shed due to infestation of the bloom 
Kind of bloom 
Per cent 
of bolls 
shed 
Uninfested.. 
Infested {immature larvae) 
Infested (mature larva?)... 
61 
93.1 
93,,74 
.The only difference noted during the experiment between ike 
snedding of the bolls of the two kinds of infested blooms was -that 
those of the last group in the table were shed sooner than those of 
the second group. The average of the last two (93.42 per cent) 
60776— 26f 3 
■ V 
