26 
WHITE FLIES INJURIOUS TO CITRUS IX FLORIDA. 
or less extent. (See fig. 1.) The 17 counties referred to, arranged in 
order of the number of bearing citrus trees, is as follows: Orange, Lake, 
Volusia, Polk, Putnam, Brevard, Hillsboro, De Soto, Lee, Manatee, 
Dade, Marion, St. Lucie, Osceola, Sumter, St. John, and Alachua. 
Palm Beach as well as Dade and Monroe Counties are infested with the 
cloudy-winged white fly, as hereafter noted, but so far as known the 
citrus white fly does not occur there. In order of the percentage of 
groves infested the foregoing counties which are known to be infested 
would be arranged about in the following order, so far as our obser- 
vations and records show: Marion, Alachua, St. John, Manatee, 
Orange, Lee, Volusia, Polk, Putnam, Lake, Hillsboro, Sumter, De 
Soto, Osceola, and Brevard. If the groves infested by the cloudy- 
winged white-fly only were also taken into consideration, Hillsboro 
and Lake Counties 
would be transposed 
in the list, as would 
Osceola and Brevard, 
but aside from this 
there would be no 
change. The arrange- 
ment is only approxi- 
mate, being based on 
observations made 
by the various men 
connected with the 
white-fly investiga- 
tions upon informa- 
tion and samples of 
infested leaves re- 
ceived from corre- 
spondents and upon 
nearly 250 replies received in response to circular letters sent out in 
the spring of 1907. 
At the present time the writers estimate that throughout the State 
of Florida about 40 per cent of the citrus groves are infested by the 
citrus white fly, and that an additional 5 (or 10) per cent are infested 
by the cloudy-winged white fly alone. 
The citrus white fly occurs in nearly all the larger towns in north- 
ern Florida, infesting the various food plants which are grown as 
ornamentals as well as the citrus fruit trees which are grown to a 
limited extent. The insect is of common occurrence, principally on 
China trees, cape jessamines, and on privet and hedges of Citrus 
trifoliata in South Carolina and in southern Georgia, Alabama, Mis- 
sissippi, Louisiana, and Texas. In the last two States citrus fruits 
are being grown quite extensively, and a large percentage of the 
citrus-growing localities are infested. 
Fig. 1. 
-Map showing distribution of the citrus white fly (Aleyrodes 
citri) in Florida. (Original.) 
