no 
FLORIDA STATE HORTICULTURAL SOCIETY 
onies for a few weeks, after which the 
whitefly died out, so that it was difficult 
or impossible to find live material, al¬ 
though the old colonies, dried out and 
matted down, were visible on the trees 
for several months or even a year. These 
old colonies are rendered more conspic¬ 
uous by becoming heavily infested with 
purple scale, causing the leaf to turn yel¬ 
low at that spot. 
In other instances the infestation has 
been more persistent, the white flies be¬ 
coming more or less permanent residents 
of the trees where they may do nearly as 
much damage as does A. Citri. This has 
been the case with certain dooryard trees 
in West Tampa for the past three years. 
In two groves, both in Lakeland and 
about a mile apart, the woolly whitefly 
during the spring and early summer of 
1913, inflicted much more damage than 
A. Citri ever did in the same length of 
time. 
CONTROL. 
Our spraying experiments show pretty 
conclusively that the woolly whitefly will 
yield to the same spraying solutions that 
have been found to be most efficient 
against the other citrus whiteflies, viz., the 
miscible oils, but the spray should be ap¬ 
plied while the insect is in the early larva 
stages. The pupa is so well protected by 
the growth of wool matted up with honey- 
dew and various molds that it is difficult 
to reach it with a spray solution. Expe¬ 
rience has been that this insect is event¬ 
ually brought under control by its ene¬ 
mies and especially the wasp-like parasite 
Eretmocerus haldemani. But in the case 
of even a moderate infestation it is not 
wise to depend solely upon the parasites to 
control it, on account of the rise of the 
purple scale, but to spray with one of the 
miscible oils. These oils will doubtless 
kill some of the parasites, but few at the 
time recommended, as there are compara¬ 
tively fewer about at that time than when 
the adult whiteflies are emerging. 
NUMBER OF BROODS 
We have not been able to rear this in¬ 
sect in the insectary and carry it through 
a year, as we should like to do. During 
the past year we have made the following 
observations in the field: 
December, 1912—Adults and pupae. 
May 15, 1913—Mostly in the second 
(some in the third) larval stage. 
May 15, 1913—Adults emerging in 
large numbers. 
June 11, 1913—Mostly in the second 
(some in the third) larval stage. 
July 11, 1913—Mostly pupae, but some 
adults. 
August 15, 1913—First stage larvae 
eggs and some adults. 
October 10, 1913—Adults and eggs. 
October 28, 1913—First and second 
larval stages and some eggs. 
December 4, 1913—Good sized larvae 
and pupae. 
February 1, 1914—Adults and eggs. 
February 27, 1914—First and seconc 
larval stages. 
From field observations and from th< 
examination of much material sent in b} 
correspondents, we can approximately re 
construct the seasonal history of the in 
sect. . 
There are four generations per year 
with the maximum number of adults fly 
