RASPBERRIES 1363 



No trellis is used in most plantations; vet in some localities the 

 two-wire trellis is used as described under red raspberries, page 

 1 .">.")(>. Winter protection is given in sections requiring such 

 treatment, as the black raspberry is slightly more tender than the 

 red raspberry. 



INSECTS 



The insects already described as attacking red raspberries 

 the snowy tree-cricket, raspberry cane-borer, raspberry sawfly, and 

 the red spider also attack black raspberries, and their discus- 

 sion is given under red raspberries, pages 13r>r> and 1358. 



DISEASES 



Tune blight and yellows have been described under red rasp- 

 berries, page 1358. In addition to these are the following. 



Anthracrwse 



This is one the most serious diseases of black raspberries. 

 Grayish-brown spots or patches develop on the plants, especially 

 on the canes. Red raspberries are seldom attacked by this dis- 

 ease. The plants are greatly weakened, if not killed outright. 

 Although bordeaux mixture is a preventive, the .increased yield 

 secured by spraying is usually not sufficient to pay for the cost of 

 spraying. The following measures are suggested: 



Plants should have a maximum amount of sunlight and air, 

 and should not be crowded. Remove the old wood and the worst 

 of the diseased canes soon after harvest. Make -frequent plant- 

 ings on fresh land, selecting only healthy plants for setting. Give 

 the best of care, both in cultivation and in feeding the plants, to 

 secure maximum results early in the life of the plantation. 



Orange 



This is a most serious disease of both black raspberries and 

 blackberries, seldom troubling red raspberries. The yellowish- 

 green foliage, checking of growth, and the orange-red color of the 

 under surface of the leaves are indications of the presence of the 

 disease. The only treatment is to dig and burn infested plants' as 

 soon as the disease is detected. 

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