FLORIDA STATE HORTICULTURAL SOCIETY. 
39 
Prof. Rolfs.—There are three or four 
periods during which the adults appear in 
countless numbers. During this time it 
is probably not best, to spray, excepting 
where it is done for special purposes, 
spraying can be done most effectively be¬ 
tween the broods. 
Mr. Griffing.—Prof. Rolfs mentions 
that a large portion of the State is now 
free from the white fly. While this dis¬ 
cussion has been confined to Manatee, 
I would ask if it can be determined just 
where the territories are that are now 
affected. 
Prof. Rolfs.—We can not give you the 
definite data as to what portions of the 
State are infested with white fly and 
what portions are not. Prof. Gossard 
had this pretty thoroughly worked out, 
but we know that every year the insect 
is spreading to new districts and we know 
how reluctant people are especially if he 
happens to be a Nurseryman to admit that 
white fly is present on his premises. A 
man might not hesitate to state the fact 
privately but he would not like to have it 
advertised. 
t 
Mr. -.—I have specimens of fun¬ 
gus which I presume the citrus growers 
are familiar with. Last year the State 
was full of this particular fungus. The 
damage is not known as yet, but we hope 
to know about it soon. Last year we had 
scarcely any scab at all, but this year we 
have an abundance of it. Some one 
found that by spraying the scab with 
Bordeaux mixture that it could be con¬ 
trolled. This scab will develop on the 
sweet trees also. xA.lso on grape fruit it is 
very severe. [The fungus referred to is 
the sour orange scab. Cladosporium ele- 
ganus. Sec.] 
Mr. Longley.—Is it more prevalent on 
grapefruit or oranges? 
Mr.-.—On lemon it is more severe 
than on any citrus stock. 
Mr. Longley.—Is the fungus shown on , 
vigorous growing trees? 
Mr.-.—The fungus attacks trees 
when they are very small, and it seems 
to make very little difference whether the 
tree is growing thriftily or not. I believe, 
however, we see it more frequently on 
thrifty trees. 
Mr. Longley.—Will the fungus spread 
during the summer? 
Mr. -.—Very little growth appears 
during that time, but if we have a dry 
season we are not apt to get much of it. 
It requires a rainy season for this to 
grow. ^ 
Mr. Longley.—Did that same fungus 
attack lemon trees prior to the freeze. 
Mr. -.—Yes. 
Mr. Beers.—Will inoculation of blue- 
stone be beneficial? 
Mr. -.—I should say^ no. This 
would have no preventative effect. 
Mr. Taber.—To what extent have you 
found this scab affecting trees? 
Mr.-.—Some sweet oranges are 
sometimes affected slightly; the satsuma^ 
very badly. Ordinary oranges we have 
no trouble with at all after the buds begin 
to grow. The scab I referred to was 
that on tall bearing trees, and so differs 
in that respect. 
Mr. Waite.—Referring to the sour scab 
on the grapefruit, I will say that in the 
last few days I have received a letter 
from a gentleman who says his trees are 
all more or less effected with fungi, with 
the exception of about two acres where 
the trees are located on a shell mound, 
there they seem to be free from , it, is it 
lime the trees require? 
Dr. Rolfs.—I cannot answer as to this 
question as we have made no experiment 
