88 
FLORIDA STATE HORTICULTURAL SOCIETY. 
upon the nature of the insecticide. 
Kerosene and soap solution would do 
very little injury unless you keep the 
trees sprayed all the time. Of course, 
very caustic insecticides and those con¬ 
taining fungicides may do very much 
harm. 
Dr. Inman—Thrip juice, which is a 
solution of arsenic—what about that? 
Dr. Berger—I do not know the in¬ 
gredients of thrip juice. I cannot an¬ 
swer definitely whether the arsenic 
will do harm or not, but probably not. 
I have never seen arsenic recom¬ 
mended as a fungicide. 
Mr. Mote—How about the sulphur 
solution ? 
Dr. Berger—It may be very injuri¬ 
ous to fungi if used too frequently. Of 
course, one spraying or dusting of the 
trees with sulphur will do very little 
damage, especially if the spraying is 
not too thorough and applied only to 
the parts of a tree affected. The Rex 
lime and sulphur solution is now re¬ 
commended and sold as fungicide. 
Mr.-How about the resin wash? 
Dr. Berger—I imagine it would be 
injurious, because it is generally quite 
caustic, but one or two sprayings in 
winter will probably do little harm to 
the fungi. 
Mr. Henderson—Do you know any¬ 
thing about the Gold Dust solution? 
Dr. Berger—If Gold Dust is nothing 
but powdered soap, as I believe it is, 
it will do very little, if any, injury to 
the fungi. 
Mr. Henderson—I also wish to say 
that I visited thirty or forty orchards 
in the state and in every one, but one, 
there was scale, somewhere. I intro¬ 
duced the fungus into all the orchards 
and so far as I know, the scale is dead 
in all of them. My experience has 
shown that the fungi is not only the 
cheapest but the best remedy for San 
Jose scale and orange scale. I believe 
that the black fungus is really more 
effective and stands more hardship 
and spreads more rapidly than the red. 
The application is very simple. You 
just tie a small piece of wood contain¬ 
ing' the fungi to about every tenth 
tree, and your work is done. It is 
much less trouble and expense to get 
the fungi and apply it than it is to 
spray one time. One man can go over 
about twenty acres in a day. 
Prof. Rolfs—I might say, in open¬ 
ing this discussion, that to use the 
fungi requires courage and intelli¬ 
gence. I know the results of Mr. 
Henderson’s experience must be espe¬ 
cially gratifying to Mr. Hart, since he 
has been harping on that for fifteen 
years. It must be gratifying to him 
to see that, a large number of citrus 
growers are coming around to see that 
the fungi are of invaluable assistance 
to them. 
Mr. Warner—I would like to ask 
whether it is better to combat the rust 
mite with a spray or dust. 
Mr. Skinner—The liquid spray just 
hits the outside of the tree, but the 
dust goes into the whole tree, and I 
think it is more effective. Besides, 
liquid spray is so unpleasant to use 
that ordinary labor will shirk their 
work to get through quicker. The 
lime is hard on their hands and faces 
and gets into their eyes and they don’t 
like to use it. 
Mr. Stevens—If you use the dust 
spray, try sulphur and no lime. It does 
not increase the scale at all. The liquid 
spray, in my judgment, injures the 
