FLORIDA STATE HORTICULTURAL SOCIETY 
This dilution will kill the mites, but it will 
not kill the eggs. To kill the eggs this so¬ 
lution should be used at i to 40. This 
spray can be made as follows: 
SULPHUR-SODA SOLUTION 
Sulphur_30 pounds 
Caustic (Soda (98 per cent) 20 pounds 
Water_20 gallons 
The sulphur should be very carefully 
sifted and all the small lumps broken up 
to the finest powder. Wet the sulphur 
with 3 gallons of water until it becomes 
a thin paste. Care must be taken to have 
every particle of sulphur wet to prevent 
burning. Slowly add the caustic soda and 
mix well with the sulphur paste, using 
a stick for stirring. If the paste has a 
tendency to burn, a little water may be 
added. When mixed about 16 gallons 
more of water should be added to make 
20 gallons of stock solution. 
Use one gallon of the above stock so¬ 
lution to 40 gallons of water. 
LIME AND SULPHUR SOLUTION 
Until the present writer investigated 
the matter it was usual to recommend 
lime and sulphur solution at approximate¬ 
ly 1 to 200. This solution will kill the 
adult mites but will not kill their eggs. I 
have found out lime and sulphur solution 
testing 32 Baume should be used 1 to 75. 
It will do no hurt to the fruit or trees if 
used at 1 to 50, and when used at this 
strength it may kill out more scale than 
when used at 1 to 75. This solution can be 
purchased in the open market from the va¬ 
rious dealers in insecticides or can be 
made according to directions which will 
11 9 
be furnished on application to the Bureau 
of Entomology or to this office. 
It is advisable from a financial stand¬ 
point that the orange growers make this 
solution themselves since the saving is 
about two thirds. The cost to make this 
material will be less than $3.25 per barrel 
of 50 gallons, while the cost when pur¬ 
chased from dealers is about $10.00 per 
barrel. 
Owing to the fact that lime and sul¬ 
phur solution has stable qualities which 
makes it remain a long time on the trees 
I certainly recommend this solution above 
all others for this pest. There is nothing 
which an orange grower can use on his 
trees which seems to do them so much 
good as this solution. Some experiments 
already conducted would indicate that an 
excessive use of this solution makes the 
fruit mature from two weeks to a month 
* 
earlier than on adjoining rows which are 
either left unsprayed or sprayed with oil 
emulsion. There is some question, how¬ 
ever, if the solution used at 1 to 75 will 
produce the effect of hastening the ma¬ 
turity of the fruit. 
dusting 
Several people in this state have had 
satisfactory results by the application of 
a mixture of hydrated lime and flowers of 
sulphur. This mixture consists of 1 lb. 
of flowers of sulphur and 2 lbs. of hy¬ 
drated lime, and in some instances the 
pure sulphur is applied. This mixture 
must be applied very frequently since the 
eggs of the rust mite are uninjured by the 
dust. It is applied by means of a dusting 
machine. 
