46 
FLORIDA STATE HORTICULTURAL SOCIETY 
a sticker and more will probably be nec¬ 
essary to kill insects. 
The bordeaux used was mixed in lots 
of 2, 3 and 4 gallons at a time. 
Several strengths of bordeaux were 
used but none weaker than about double 
strength (5-5-20). Other strengths used 
were 5-5-13.5 (bordeaux 2 weeks old) ; 5- 
5-10; 5-5-15. It is intended to conduct ex¬ 
periments with weaker mixtures as soon 
as time permits. The stronger mixtures 
were chosen because it was believed that 
the oil would more readily mix with 
them, which is probably the case, and as 
the mixture of bordeaux is weakened it 
may be found that a limit will be reached 
at which little or no oil will mix with it, 
unless it should prove to be a fact that 
even pure water will take up some of the 
oil. 
COST 
The cost of bordeaux is of course very 
• high now on account of the high cost of 
copper sulphate. The addition of linseed 
oil at the rate of three per cent about 
doubled the cost of 5-5-20 bordeaux when 
copper sulphate was 10c per lb., and lime 
ic. per lb. This doubled cost, however, 
should be more than offset by the length 
of time the linseed oil bordeaux will re¬ 
main on the foliage. With copper sul¬ 
phate three and four times the cost pre¬ 
viously indicated, the proportional in¬ 
crease by the addition of oil is of course 
less. It is probable, however, that one 
per cent or per cent oil can be mixed 
with regular strength bordeaux (5-5-40 
or 5-5-50) which would cheapen the pro¬ 
duct somewhat, and probably be sufficient 
as a “sticker.” 
It should be added here, that in case 
sufficient oil should not properly mix with 
regular strength bordeaux, which would 
be explained by the lack of sufficient solid 
material in the mixture necessary to as¬ 
sist in holding the oil in suspension, that 
additional quantities of lime, perhaps 2 or 
3 times as much as is indicated in the for¬ 
mulas for bordeaux, may probably be 
added to make up this deficiency. Again, 
less oil may serve quite as well as a stick¬ 
er, especially on potatoes and other vege¬ 
tables where it is not necessary to have 
the bordeaux stick so long, but where it 
is still necessary to use something to keep 
it from being washed off by rain. 
Finally, in regard to cost, each grower 
must decide for himself whether the ad¬ 
ditional cost of the oil is worth while; 
and whether using the oil as a sticker 
will save him an additional spraying or 
two. 
uses 
The experiments conducted indicate 
that linseed oil bordeaux can be applied to 
all kinds of plants without serious injury, 
though there may be exceptions. It is be¬ 
lieved to be especially useful on citrus 
trees where a long-sticking bordeaux is 
needed, and on potatoes and other vege¬ 
tables where a sticker, to keep the rains 
from washing it off, is desirable. At 
this time the writer cannot advise wheth¬ 
er or not powdered sulphur can also be 
added to this mixture, but it is his belief 
that it can. This point can readily be de¬ 
termined by each grower for himself. 
The addition of about two pounds of 
powdered sulphur to each 50 gallons of 
the mixture should serve at the same 
time to assist in the control of mites, such 
as rust mite, red spider, purple mite, etc. 
