THE CITRUS WHITE FLY: SEASONAL HISTORY. 83 
Table XVII. — Emergence of adult citrus white flies at Orlando, Fla. 1 
Record 
Eggs depos- 
ited. 
April. 
May. 
June. 
July. 
August. 
No. 
1-15 
16-30 
1-15 
16-31 
1-15 
16-30 
1-15 
16-31 
1-15 
16-31 
1 
Feb. 22 
Mar. 3 
Mar. 18-25". . . 
Apr. 20 
June 16 
July 17 
July 17 
July 19 
July 26 
Aug. 1 
Aug. 8 
Aug. 9 
Sept. 18 
Sept. 21 














1 













85 
44 
1 











2 
44 
51 











3 
4 
5 
30.3 
50.1 










2.9 
28.6 






















4.9 
8.2 
( 3 ) 









9.9 



6 
7 
8 
9 
10 
11 
, 12 
13 
14 









32.1 
a 







Record 
Eggs deposited. 
September. 
October to 
March. 
March. 
April. 
May. 
No. 
1-15 
16-30 
1-15 
16-31 
1-15 
16-30 
1-15 
16-30 
1 
Feb. 22 
2 
Mar. 3 
3 
4 
Mar. 18-25 
Apr. 20 



( 2 ) 














5 
June 16 
6 
July 17. 
24.4 
23.9 
8.7 
23.8 





0.4 
6.9 
1.7 
6.5 
3.3 
2.7 





















43.1 
67.3 
89.2 
64.3 
85.6 

1.9 
.4 
5.4 
11.1 











7 
July 17 

8 
July 19 

9 
July 26. . . . 

10 
Aug. 1 

11 
Aug. 8 
12 
Aug. 9. . . 
98.7 
38.3 
38.6 
1.3 
46.8 
47 
6 
14.9 
14.7 




13 
14 
Sept. 18 
Sept. 21 


1 This table is introduced to demonstrate the two emergence periods for individuals developing from 
eggs deposited at the same time. It is not intended to represent the abundance of adults at different 
times of the year. Figures represent percentages. ' | 
2 Only one fly survived to winter over. ' 
3 One fly emerged July 30. Leaf was broken off on same day. Development of flies indicated that at 
least 50 per cent would have emerged during August. 
This makes it possible for adults emerging during the first period 
to deposit eggs for a second generation, a portion of the adults of 
which (first brood) will emerge at the time of the second emergence 
period (second brood) for the first generation, while a large proportion 
of the remaining individuals on the leaf to all appearances remain 
stationary in their development, though actively secreting honeydew, 
until the approach of the first emergence period of the second genera- 
tion started by the second brood of the first generation, when they 
rapidly mature and emerge with this brood. However, this double- 
brooded character of each generation up to and including generations 
started in early August does not obscure the three well-defined 
" broods" of adults, to be discussed under " Seasonal fluctuations in 
the numbers of adults or so-called 'broods,'" but shows that the 
adults appearing during the three general emergence periods do not, 
strictly speaking, represent a single brood of one generation, but 
different broods of different generations. By far the greater number 
