16 
BULLETIN 1374, U. S. DEPARTMENT OF AGRICULTURE 
The data in this table are shown graphically in Figure 7. In the 
graph the figures of Table 14 are reduced to number of forms per 
plant. A fourth line in the graph shows the development of the 
infestation in mature green bolls on the plants during the same 
period of time. A great decrease occurred in the number of forms 
on the plants between the middle and the end of July. Reference 
to Table 14 shows that this was due to both shedding and absence 
of new fruiting. Following the irrigation, however, there was a 
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Fig. 
-Daily average number of total blooms and blooms infested with the pink bollworm 
per acre, 1921 and 1922 records 
great increase in fruiting, and shedding practically ceased for a 
time. 
The early infestation (fig. 7) was so light that, even if it caused 
shedding, this could have had no appreciable effect on the total 
shed, which was very great at that time. During the period of the 
second growth a much greater part of the shed forms was infested. 
Comparing this, however, with the infestation of blooms on the 
plants (fig. 6), it will be noted that an equally high percentage 
of the blooms on the plants was infested. This indicates that even 
