FLORIDA STATE HORTICULTURAL SOCIETY. 
75 ; 
ply of honeydew. upon which the Sooty Mould lives, is* 
stopped, the mould will disappear without other special treat¬ 
ment. 
The White Fly passes the winter in the mature larval or 
pupa stage, and begins to hatch out into the mature stage 
(Imago) about the middle of March. This year, 1894, I first, 
noticed them beginning to appear on the 13th of March. The 
eggs from the fall br. od of flies hatch about the middle or last 
of October. So from the middle of November till March, is. 
one of the long periods when the disease may best be treated. 
Each fly lays from twenty to twenty-five eggs. These re¬ 
quire about three weeks for their development before they 
hatch out into the larval stage. Thus the eggs from the March 
and April brood do not begin to hatch until the middle of 
April, and continue, hatching till the middle ot May. The 
larvae from thes^ eggs continue their development till about 
the middle of June or first of July, when the mature flies 
hatch out again, and begin laving eggs for the next broody 
which hatches out from the middle of September to the first 
of October. 
This September brood of flies, the third brood, is the last of 
the season; the eggs they lay hatch out into the larval stage 
about the middle or last of October, and this stage continues, 
through the winter as described above. 
Considerable question yet remains as to the effect of the va¬ 
rious insecticides on the eggs, and while this doubt exisis it 
is best to arrange the times of spraying so that we do not. 
spray till the eggs are all, or almost all hatched out into the 
larval stage. As there are three periods in ihe year when the 
insects are in this stage, there are thus three periods when one 
may profitably spray for the pest. One must judge when to 
spray by the condition of the insect, being sure they are in 
the larval or pupa stages. In general, this condition is reached 
about three weeks or a month after the mature fl es are no¬ 
ticed to be most abundant. 
While many remedies have been tried and experimented 
with for this pest, none have been found up to the beginning 
of this year which had pioved satisfactory. In our experi¬ 
ments with this pest this season, we have tried every spray 
which promised success, applied in various ways. We have? 
tried to make our tests thorough, and believe we have suc¬ 
ceeded in demonstrating the effectiveness of certain standard 
spra} T s, beyond question. 
In California, fumigation with hydrocyanic acid gas is be¬ 
ing used with great success against various scale insects. So 
successful is it, indeed, that some claim it to mark a new era 
in the treatment o;f sueh. diseases.. We^for this reason, made 
