INJURIOUS INSECTS OF 1909 AND IQIO. 167 
6-6-50 bordeaux mixture should be employed, but this would be 
almost sure to injure the foliage on the trees later in the season.. A 
3-4-50 mixture of bordeaux is sometimes used without foliage in- 
jury resulting, but even this mixture may in some seasons be in- 
jurious. Even the weaker solutions proved injurious in experiments 
conducted by the Pathology Department in 1910. Although its 
worth on plums has not yet been absolutely demonstrated, self boiled 
lime sulfur has given much promise and should be tried. 
Brown Ror: Although brown rot is especially destructive on 
fruit, it occurs also on leaves and twigs, causing a blighted appear- 
ance and finally killing them. The fruit is more especially suscepti- 
ble in the later stages of its development, moist weather being very 
favorable to the spread of the disease. Small, brownish spots first 
appear ; these enlarge rapidly until the entire fruit may be covered. 
Upon the surface of the fruit brown patches of spores appear ; these 
spores may be blown long distances, thus spreading the disease. 
The diseased fruits finally shrivel and dry, often remaining on the 
tree indefinitely. Infection in the spring is caused largely by these 
mummied plums, which should, of course, be destroyed. 
Spraying should be carried on as for black knot; the self boiled 
lime sulfur mixture has proven effective in controlling the same 
disease on peach, and will probably prove efficient when used on 
plums. Naturally, since plums are more liable to become infected 
after they are at least half grown, spraying should be continued 
until late in the season. 
Frre BuicHt: (See Apple). 
Pitum Pocket: The fungus attacks the fruit, destroying the 
pit and converting the entire fruit into a hollow, bladder like sack 
which later falls from the tree. Twigs may also be infected, and it 
is supposed that the disease hibernates mainly in this way. The 
disease apparently does not spread very rapidly, so that pruning out 
and destroying affected parts, together with the spraying for brown 
rot and black knot, will help keep it in check. 
Powpvery MiLtpEw: (See Apple). 
Scas: Dark brown, scabby spots appear on the surface of the 
fruit, especially in a rainy season. The disease will yield to the 
treatment given for brown rot. 
SHot Hote: Very numerous, rather small, brown spots ap- 
