FuNGorjs Diskases oe Colorado Crop Pi,ants 
r 
Plate X. Hold-over canker of pear twigs. Note the cracks from which the oozing takes 
place. 
mune by the introduction of a fluid into the sap. These have not 
been proven successful. 
(3) Strict sanitation and eradication methods are the most 
satisfactory means of control. 
(a) All sources of infection should be destroyed. This can 
best be done by removing all diseased portions in the 
autumn after the leaves have fallen. Affected branches 
should be cut back from ten to fifteen inches below the 
discolored wood. Cankers in crotches should be scraped 
down to live wood, and disinfected. 
(b) Trees should be inspected in early spring, and all cases 
of blight removed and burned. A weekly inspection of 
all trees during the growing season should be carried on 
as soon as the blossoms fall, and all cases of blight re¬ 
moved and burned. 
(4) Tools as well as all cuts should be disinfected with corro¬ 
sive sublimate, 1-1,000, so that bacteria are not spread. 
(a) The corrosive sublimate may be carried in a bottle or 
wooden pail, and applied to the wounds and tools with 
a sponge. 
(5) Collect diseased material in a sack; the sack may be strap¬ 
ped to the operator for convenience. Burn all affected material. 
(6) A systematic and continuous fight in cutting and destroy¬ 
ing diseased portions is essential for successful control. 
(7) Disease is spread by insects. Hence keep these down by 
spraying with a good insecticide. 
(8) Tlie native thorn apples and mountain ash are a host for 
the organism causing fire-blight. Trees in the immediate neigh¬ 
borhood should be destroyed. . 
