Small Fruits tor Colorado 
19 
Preventative measures can be taken by applying Bordeaux 
Mixture half strength to the plants with the first appearance of 
the spots or, better still, before the spots appear. In badly infested 
cases the infested portion of the plant should be burned and the 
remaining portions thoroughly sprayed with Bordeaux as indicated 
above. 
Raspberry Cane Blight .—This fungous disease is widely dis¬ 
tributed through the eastern and middle states, doing considerable 
damage to raspberry plantations. It is also found in Colorado, 
though up to the present little damage has been done. 
The disease generally starts near the ground on the fruiting 
canes in small patches which gradually enlarge and often com¬ 
pletely girdle the cane, causing death. Generally the patches move 
upward on the canes without girdling. The diseased spots are usu¬ 
ally lighter in color than the natural color of the cane, but the dead 
tissue below is dark brown. At later stages these spots become 
darker in color with a smoke-like appearance due to presence of 
spores. Diseased canes are brittle and easily broken, due to the 
dead and dry areas. 
Remedies .—The surest way to control this disease is to cut 
out and burn all infested canes as soon as the disease is discovered. 
The old fruiting canes should also be cut out and burned as soon as 
the harvest is past. Remove and burn all litter and dead branches 
or wood among the bushes. Give a thorough application of Bor¬ 
deaux Mixture, full strength, early in the spring before the leaves 
come out and one or more applications during the summer, using 
Bordeaux half strength. 
Sphaerelh, Cane Blight .—This disease of the raspberry has 
been quite destructive in northeastern Colorado, and Professor 
Sackett, of the Experiment Station, has made a thorough study of 
it during the past three or four seasons. The results of Professor 
Sackett’s work will be presented in a bulletin soon to be published. 
The presence of the disease is indicated by bluish brown 
patches on the lower portions of the canes, the wood underneath 
turning dark brown and .dying. a The fruiting canes generally suf¬ 
fer most and often the fruiting buds on the lower half or three- 
quarters of the stems are killed, thus greatly reducing the yield. 
Spraying with Bordeaux Mixture, full strength, early in the spring 
before growth starts and two or three weeks later, using Bordeaux 
Mixture, half strength, is recommended. Precautions should be 
taken in planting by setting only healthy plants. Diseased canes 
should be cut out and burned as soon as discovered. 
