. Bulletin. Agriculture. 6 N. H, AGR. EXPERIMENT STATION. [Bulletin 157 the end of the summer and the food supply of the tree simi- larly decreased. It is on the fruit that the fungus produces its most character- istic and serious effects. Here it forms superficial olive colored spots known among apple dealers as "scab," "fungus" or "black spot" (Fig. 2). The spots are usually 1-8 to 1-2 of an inch in diameter. The mycelium begins its development beneath the cuticle, but soon sends up erect sporophores (spore stalks), which break thru to the surface to free their
. Bulletin. Agriculture. 6 N. H, AGR. EXPERIMENT STATION. [Bulletin 157 the end of the summer and the food supply of the tree simi- larly decreased. It is on the fruit that the fungus produces its most character- istic and serious effects. Here it forms superficial olive colored spots known among apple dealers as "scab," "fungus" or "black spot" (Fig. 2). The spots are usually 1-8 to 1-2 of an inch in diameter. The mycelium begins its development beneath the cuticle, but soon sends up erect sporophores (spore stalks), which break thru to the surface to free their spores. (See A in Fig. 6.) The spores and sporophores give the spot its Fig. 2.—Apples affected with Scab. (Lamson.) olivaceous appearance. The marginal portion of the ruptured cuticle usually remains, giving the spot a light gray border. The fungus checks the growth in the adjacent tissue to such an extent that apples attacked early in the season often become dwarfed and one-sided, and sometimes badly cracked (Fig. 2). The underlying portions of the apple are protected by the formation of a corky brown tissue beneath the scab. This pro- tection is onh^ i^artial, however, as scabbed apples wither rapidly in storage and the scab spots are quite commonly the point of origin for rots. Even slightly scabbed apples are, therefore, unfit for anything but immediate 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 New Hampshire Agricultural Experiment Station. [Hanover, N. H. ] : New Hampshire Agricultural Experiment Station
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