80 
FLORIDA STATE HORTICULTURAL SOCIETY. 
vae at this time is believed to be the ex¬ 
planation. If the absence of young lar¬ 
vae is the explanation for the failures 
during January and March, this barren 
period is believed to also include Decem¬ 
ber and February, since in neither one 
of those two months are there any but 
but a few [in December] young larvae. 
In other words, the barren period for 
introducing fungus will extend from De¬ 
cember through March or until the 
young larvae of the spring brood of 
adults become abundant either in lam 
March or in April. If larvae of the 
fourth stage and pupae are practically 
immune to the attacks of fungus as the 
January and March experiments indicate, 
then we may expect another barren period 
of a few weeks immediately preceding 
the appearance of: the second brood of 
adult “flies” sometime in June or some¬ 
times earlier. Preceding the appearance 
of the third brood of adults, there may 
also be a barren period, when the white- 
fly is in the fourth stage and pupae; but 
generally the separation of the second 
and third broods is not so well defined; 
larvae of all stages continuing to exist 
during the interval of the greatest abun¬ 
dance of adults. Some few trees in Mr. 
Wm. E. Heathcote’s grove at St. Peters¬ 
burg were sprayed on May 17, 1907, 
with spores of the red Aschersonia. A 
good growth of this fungus had devel¬ 
oped from this spraying by the end of 
last summer, although in the beginning 
only a few fungus pustules could be 
found. This experiment clearly indicates 
that we can begin operations in May; 
and earlier as the DeLand experiments of 
April 21 and 22 have shown us. Better 
stated, the time to begin to introduce 
fungus in spring is when the young lar¬ 
vae of the spring brood of adult “flies” 
are becoming abundant (that is by the 
dozen) beneath the leaves. 
Operations were begun last spring in 
Mr. Heathcote’s grove for the main pur¬ 
pose of demonstrating what can be done 
in one season with the spore-spraying 
and leaf-pinning methods of introducing 
the fungi. The frost of the previous 
December together with the prevailing 
drought having defoliated so many citrus 
trees in sections where fungus had been 
abundant, that only small quantities of 
fungus could be obtained. However, 
continued efforts on the part of Mr. 
Heathcote, together with some supplies 
of fungus and aid from the writer, re¬ 
sulted in giving a wholesome sprinkling 
of the fungi, especially the red i\scher- 
sonia, together with some yellow Ascher¬ 
sonia and brown fungus, by the end of 
1907. Mr. Heathcote has recently writ¬ 
ten, stating that the fungus does not ap¬ 
pear to be as abundant in his grove this 
spring as it was last winter. This is 
quite what I expected, since it spreads 
but little if at all during the winter, and 
of course what has previously developed 
becomes weathered; besides some leaves 
drop, thus reducing the amount of fun¬ 
gus present in the trees. 
It would be consuming an unnecessary 
amount of time were I to undertake to 
say something about all the experiments 
that I have started in different parts of 
the State. Suffice it to say that I have 
started spore-spraying and leaf-pinning 
operations for introducing fungus in the 
following places: Lake City, Leesburg, 
New Smyrna, Kissimmee, St. Petersburg, 
DeLand and Gainesville, in all seven lo¬ 
calities. Taking a single grove or yard 
in which trees were treated in these sev¬ 
eral localities as the unit and also count¬ 
ing as separate experiments the differ- 
