142 
FLORIDA STATE HORTICULTURAL SOCIETY 
perhaps, than the rest, that lit on a grape¬ 
fruit and liked it, and there was born an¬ 
other family. He said the orange may 
get it, and it may not. So, I tell you it 
behooves us to stamp scab out. 
Mr. Rolfs: If Mr. Sampson is here, 
he probably had the first experience of 
any of the citrus growers in fighting the 
scab successfully. If he is here, I would 
like for him to tell you. As he does not 
seem to be here, the short of it is this: 
they used Bordeaux Mixture and ammon- 
iacal solution of copper carbonate, spray¬ 
ing just before the spring growth came on 
and just after the spring growth. It was 
then discovered for the first time that Bor¬ 
deaux Mixture would be followed by an 
extremely heavy attack of scale insects. 
We were all in the dark about that part 
of it. But it turned out very successfully. 
Some years the grapefruit was scarcely 
affected at all; we thought grapefruit was 
practically immune and the spreading of 
the scab from sour stock and lemons to 
grapefruit has occurred since that time. 
So we have a very serious and difficult 
enemy to deal with. That is the sum and 
substance of the work as it was done 
twenty years ago. It was very success¬ 
fully and emphatically carried out with 
the lemons. 
Mr. Skinner: Do you think lime sul¬ 
phur is good? 
Mr. Rolfs: It has been tried many 
times, and no positive results obtained. 
Different forms of lime sulphur and soda 
sulphur have been tried, and so far we 
have obtained only definite, positive re¬ 
sults by using the Bordeaux, which is the 
old-fashioned bluestone and the ammonia- 
cal solution of copper carbonate. 
Mr. Skinner: How about its enter¬ 
ing the bloom this time of the year? 
Mr. Rolfs: Spray before the bloom, 
and then follow with another spraying 
after most of the fruit has set. 
Mr. Skinner: I sprayed with copper 
carbonate and sprayed that right into the 
bloom. 
Mr. Rolfs: You will not hurt many 
of the bloom when you spray toward the 
end of the bloom. There is considerable 
danger of knocking the bloom off, of 
course. Now, in the case of withertip get¬ 
ting into the bloom, it is a good thing to 
spray into the bloom, knowing that you 
are going to knock off io per cent of the 
bloom. 
In regard to the investigational work, 
Prof. Fawcett started very carefully and 
worked it up, but you will realize that 
where so much work has been done in a 
technical way, it is a very difficult matter 
to get positive advance information; new 
and available information in advance of 
what we did know. It is a subject which 
has been worked up so many times that 
the investigator will have to use a great 
deal of patience and time to work out 
and bring forward something entirely 
new. 
* 
One point further, and that is with re¬ 
gard to the matter of pruning out the scab. 
I believe if you have a young orchard in 
which the scab is appearing, pruning is 
the best way to handle it. In a large or¬ 
chard, I doubt whether it is practicable 
in all cases. 
Mr. Skinner: The results I obtained 
from pruning were very good. 
Mr. Rolfs: You were satisfied as far 
as putting down the scab was concerned, 
