22 BULLETIN 1178, U. S. DEPARTMENT OF AGRICULTURE. 
(5) Bordeaux-oil emulsion settles less rapidly, spreads more 
uniformly, and sticks at least as well as plain Bordeaux mixture, the 
oil emulsion appearing to correct the physical properties of certain 
poorly prepared or bad mechanical mixtures. 
(6) Bordeaux-oil emulsion mixes readily with both hard and soft 
water and can be used in water so hard that plain oil emulsion will 
not mix with it without special treatment. 
(7) A small quantity of Bordeaux mixture can be used as a cor- 
rective treatment for hard water to be used for spraying. 
(8) Bordeaux mixture made with lyydrated lime and oil emulsion 
has proved as effective against citrus scab and melanose as Bordeaux 
mixture made with quicklime. 
(9) Owing to the inhibiting action of the Bordeaux mixture on the 
crop of entomogenous fungi, scale insects and white flies increase 
somewhat after applications of this combination spray, but usually 
not nearly so much as after plain Bordeaux mixture, and in some 
cases no more than on unsprayed trees. The fungicidal effect of this 
combination spray outlasts the insecticidal, thus permitting scale 
insects and white flies to increase more rapidly than after the applica- 
tion of oil sprays alone. To prevent insect infestation, therefore, a 
thorough application of oil emulsion of high efficiency should be 
made, as suggested in Figure 1. 
(10) Owing to the fact that rust mites usually become more 
abundant and reach their maximum number a week or two sooner 
on trees sprayed with Bordeaux-oil emulsion than on unsprayed 
trees, the sulphur application must be made somewhat earlier than 
would otherwise be necessary. 
