
THE CITRUS WHITE FLY: SEASONAL HISTORY. 83 
TasBLeE XVII.—Emergence of adult citrus white flies at Orlando, Fla.' 

























April. May. June. | July. August. 
Record | Eggs depos- hie 
No. ited. | | 
1-15 |*16-30 | 1-15 | 16-31 | 1-15 | 16-30 | 1-15 | 16-31 | 1-15 | 16-31 
1 | Feb. 22 0 1 5 eee |e eee | ee ee ees | Mme Oe ee Ee 
DEN ANLAT Ose aac 0 0 44 AA Se ss.\|leivemes wears = gamelan tear | eee Se eee alll <tc eh dass 
3 | Mar. 18-25... 0 0 1 51 30.3 2-9) | 0 4.9 9.9 0 
git I lak 0) SAN eae ee 0 0 0 0 50.1 28.6 0 8.2 0 0 
alumeniG- = = 22 = 0 0 0 0 0 0 0 (2) Neithel | Sec eee | JEL: © 
Gh uly ie = | 0 0 0 0 0 0 0 0 0 32.1 
Ta\pluiliye tet ee 0 0 0 0 0 0 0 0 0 0 
SF amly 192-2 =. - 0) 0 0 0 0 0 | 0 0 0 0 
Oi July. 26.222). 0 0 0 0 0 0 | 0 0 0 0 
LOD EAE oS ae 0 0 0 0 0 0 0 0 0 0 
LM CATIE BE. 5. 0} 0 0 0 0 0 0 0 0 0 
12M) Ae 95-35-22 0 0 0 0 0 0 0 0 0 0 
13 | Sept. 18. 0) 0 0 0 0 0 0 0 | 0 0 
14 | Sept. 21 0) 0 0 0 0 0 0 0 0 0 
| 
September. | March. April. May. 
nv | Eggs deposited. |———__ yl Serban? = Tete le = |= 
1-15 | 16-30 | 1-15 | 16-31 | 1-15 | 16-30 | 1-15 | 16-30 
: Me | =| = : 
ct! Te 1S AS a te Ee Meet [eats ie aa Cah oon Meld Meet Aah ka 
UAE NUAT 9A ase epala Pac | ape roreta ells oat is a= lie ate on ko Shoeaaee (tees Sees ocean to] cae mos fe saserese! esr cerer 
3 | Mar. 18- 0 0 | 0 0 | 0 0 0 0 
4 | Apr. 20 (2) 07 0 0 | 0 0 0 0 
Ei] Ski) saeeen |heensese pee e=cec See roneooss = leheend Eceerecdl sec deenS) Sdagonee lbuncaesed |pqaeseus 
6 | July 17 .4 0.4 0 | 0 43.1 0 0 0 0 
7 | July 17 3.9 6.9 0 0 67.3 1.9 0 0 0 
8 | July 19 3.7 illo 0 | 0 89.2 4 0 0 0 
9 | July 26 8 6.5 0 | 0 64.3 5.4 0 0 0 
HOM ATI Eee Soe t= 0 She} 0 | 0 85.6 11.1 0 0 0 
UIE) GMs lee eee 0 2.7 | 0 | (Ot Be omeeae seOcbeaclsbodeesalesoecsee|lSan son os 
EA MALO Sm ee se. 22 0 0) 0 | 0 98.7 1.3 0 0 0 
IBulESep ils. aoe = | 0 0 0 0 38.3 46.8 14.9 0 0 
14 Sie] Oe el ae a 0 0 0 0 38.6 47 14.7 0 0 
} 







1 This table is introduced to demonstrate the two emergence periods for individuals developing from 
eggs deposited at the same time. Itis not intended to represent the abundance of adults at different 
times of the year. Figures represent percentages. 
2 Only one fiy 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 
