. Bulletin. Agriculture. 16 N. H. AGR. EXPERIMENT STATION. [Bulletin 157 APPLE RUST. Gymnosporangium spp. Apple rust is a widely distributed disease^ and in some sections is quite injurious. It is of common occurrence in New Hamp- shire and, while not one of the most serious apple troubles, it often does con- siderable damage. It some- times attacks the fruit, but its effects are usually con- fined to the foliage. Here it causes yellowish spots (Fig. 18) which usually become somewhat elevated in the center and in which are pro- duced numerous spores. The spots usually appear on the leaves in J
. Bulletin. Agriculture. 16 N. H. AGR. EXPERIMENT STATION. [Bulletin 157 APPLE RUST. Gymnosporangium spp. Apple rust is a widely distributed disease^ and in some sections is quite injurious. It is of common occurrence in New Hamp- shire and, while not one of the most serious apple troubles, it often does con- siderable damage. It some- times attacks the fruit, but its effects are usually con- fined to the foliage. Here it causes yellowish spots (Fig. 18) which usually become somewhat elevated in the center and in which are pro- duced numerous spores. The spots usually appear on the leaves in June. The spores from these spots are borne by the wind and attack the twigs of Junipers, causing morbid growths or swellings. One of the most characteristic effects produced is the so-called "cedar apples" (Fig. 19). The fungus passes the winter on the Juniper and in the spring produces gelatinous out- growths that contain numer- ous spores. These spores, when borne back to the apple foliage, produce the rust again, and thus the fungus passes from one host back to the other. Treatment. Spraying has not usually been very effec- tive in controlling the dis- ease. Since the Junipers harbor the fungus thru the winter the method of control is, obviously, to destroy Fig. IS.—Rust on apple 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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