. Manual of tree diseases . Trees. CHAPTER XVII ELM DISEASES. Fig. 21, — Leaf-spot of elm. 152 The elms (Ulmus) are common forest and orna- mental trees east of the Rocky Moimtains. They are exceptionally free from specific diseases caused by parasites. Wound-rots and slime-flux are common in the crotches of the large limbs. Chaining is often necessary to prevent split- ting at the crotches. Leaf-Spot Caused by Gnomonia idmea (Sace.) Thiim. This is the most com- mon of the leaf-spot dis- eases of elm. In wet seasons, the spots become so abundant that defolia- tion results. The fungus causing t
. Manual of tree diseases . Trees. CHAPTER XVII ELM DISEASES. Fig. 21, — Leaf-spot of elm. 152 The elms (Ulmus) are common forest and orna- mental trees east of the Rocky Moimtains. They are exceptionally free from specific diseases caused by parasites. Wound-rots and slime-flux are common in the crotches of the large limbs. Chaining is often necessary to prevent split- ting at the crotches. Leaf-Spot Caused by Gnomonia idmea (Sace.) Thiim. This is the most com- mon of the leaf-spot dis- eases of elm. In wet seasons, the spots become so abundant that defolia- tion results. The fungus causing this disease usu- ally occurs abundantly. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Rankin, W. Howard (William Howard), b. 1888. New York : The Macmillan Company
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