CHAPTER XVIII 
FUNGICIDES COMBINED WITH Porsons 
MatTerRrALs that are used for the control of plant diseases, such as 
scab, mildew, and the like, are called fungicides, as contrasted with 
materials used for the destruction of insects, called insecticides. Fungi- 
cides are not intended for the control of insect pests, and for the most 
part have no value whatever in insect warfare. 
However, one of the materials commonly used for plant diseases, 
Bordeaux mixture, has also some effect in driving away certain insects 
from plants, or at least is distasteful to them. A second fungicide, 
lime sulphur, as prepared for use in summer on trees in leaf, also has 
some value as a mild contact insecticide, of considerable efficiency 
against such soft-bodied sucking insects as plant lice. 
In addition, it is common practice to use either of these materials 
with a poison, such as arsenate of lead, added to it, as a combined 
insecticide and fungicide, instead of applying the two sprays sepa- 
rately. Directions for their preparation and use, therefore, seem 
proper at this point. 
Bordeaux Mixture 
Copper sulphate. : r : z : . + pounds 
Lump lime. ; ; P ; : ; . 4 pounds 
Water ; : : : 3 : A . 50 gallons 
Bordeaux mixture is a combination of copper sulphate, often known 
with lime and water. It may be 
’ 
as “blue vitriol’ or ‘ bluestone,’ 
bought in paste form, ready to dilute with water and apply; or it 
may easily be made at home. 
To make Bordeaux mixture, place 25 gallons of water in a barrel, 
and suspend in it, just below the surface, a cloth bag containing + 
a 
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