FLORIDA STATE HORTICULTURAL SOCIETY 
<57 
diseased rose bush not long since. Some 
distance above the ground there were 
excrescences which appeared very much 
like the crown gall and I was, I think, 
correct in pronouncing it that disease. 
METHODS OF CONTROL. 
These have in part already been sug¬ 
gested. Do not plant infested trees or 
knowingly plant those which have been 
in contact with infested ones. Nursery¬ 
men who have the best interest of the 
State at heart will not sell diseased or 
doubtfully healthy trees. Trees should 
not be sold from an affected lot and cer¬ 
tainly no honorable man will place upon 
the market trees showing the disease, 
and certainly no wise fruit grower will 
plant them. 
Such trees should be burned; old dis¬ 
eased trees should be dealt with in a 
like manner. They are generaly unprof¬ 
itable and must simply be regarded as a 
menace to their healthy neighbors. I 
do not deem it advisable to plant dis¬ 
eased ground again. If it is desired to 
treat the trees, and it may be a good pol¬ 
icy, if they are still vigorous and but 
slightly affected, they may in some cases 
be made to serve some seasons of useful¬ 
ness if treated in the following manner: 
Carefully cut out the galls down to clean 
healthy wood. Cover the wound with a 
paste made as follows: Take four 
pounds bluestone (sulphate of copper), 
2 pounds sulphate of iron, 9 pounds of 
unslaked lime, or bluestone and lime, in 
equal parts, will likely answer as well. 
Slake the lime, mix with it the bluestone 
and sulphate of iron in a finely pulverized 
state. To the mixture thus formed add 
sufficient water to reduce it to a paste. 
PECAN LEAF BLIGHT. 
It has always been stated that the pe¬ 
can has no fungous enemies. During the 
last year, however, I have observed that 
the leaves of young pecan trees were af¬ 
fected by a disease to which I have given 
the above name. Several correspondents 
have also written me regarding it, and 
have enclosed specimens. I have not 
observed that it is injurious in any mark¬ 
ed degree to old trees, but it has done 
considerable damage to nursery stock 
and to young trees recently set out. So 
far as I am aware, this disease has not 
before been reported. 
The disease is characterized by the 
browning and withering of the leaves. 
At first small brown areas are noted. 
These become larger and eventually em¬ 
brace the whole leaf. Trees affected by 
the disease make no progress. 
The disease is caused by a species of 
cercospora, which I believe to be Cer- 
cospora Halstedii, E. & E. At least, it 
corresponds in nearly all particulars with 
that species. The spores of the fungus 
are borne upon conidiophores on the dis¬ 
eased spots. When examined under the 
microscope they are seen to be hyaline 
in color or somewhat smoky and are club 
shaped. They are divided into three or 
four cells, each cell being capable of ger¬ 
mination. The conidiophores upon 
which the spores grow are darker in col¬ 
or than the spores, being quite brown. 
The spores when ripe are blown about 
by the wind, and, falling upon the leaves, 
produce again the disease. 
METHODS OF CONTROL. 
If the trees are small, they can be con¬ 
veniently sprayed with Bordeaux mix^ 
