. Diseases of cultivated plants and trees. Plant diseases; Plants -- Wounds and injuries; Plants, Protection of; Trees -- Diseases and pests. UROMYCES 295 of which often remain in the dead leaves until the following spring, when they germinate and infect any of the host- plants within reach. Uromyces betae is very common on wild beet {Beta ftiaritima), which is the origin of sugar beet, beetroot, and mangold, and the fungus common on the wild beet has passed on to the various cultivated forms. In addition to this, these cultivated forms, now growing in countries where the wild beet does not ex
. Diseases of cultivated plants and trees. Plant diseases; Plants -- Wounds and injuries; Plants, Protection of; Trees -- Diseases and pests. UROMYCES 295 of which often remain in the dead leaves until the following spring, when they germinate and infect any of the host- plants within reach. Uromyces betae is very common on wild beet {Beta ftiaritima), which is the origin of sugar beet, beetroot, and mangold, and the fungus common on the wild beet has passed on to the various cultivated forms. In addition to this, these cultivated forms, now growing in countries where the wild beet does not exist, are as badly infected with QP mmQA^^^^. Fig. S6. —Uromyces betae. i, portion of a mangold leaf dis- eased ; 2, portion of leaf with a cluster of aecidia; 3, section of portion of leaf with two uredospore pustules ; 4, aecidiospores ; 5, uredospores ; 6, teleutospores. Fig. i reduced, remainder mag. Uromyces betae as are our European plants. This I consider as one of the proofs that the fungus is by some means carried along with the plants to new countries. Now as beet or mangold is only introduced to new countries by means of seed, it follows that fungus spores must necessarily have been conveyed along with the seed. The disease has already been recorded from S. Africa, Australia, New Zealand, and the United States. The spermogonia are yellowish in colour and arranged in small, inconspicuous groups. Aecidia whitish with an irregularly fringed margin, small, arranged in circular groups on yellowish patches; aecidiospores globose or broadly. 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 Massee, George, 1850-1917. New York : Macmillan
Size: 2667px × 937px
Photo credit: © Paul Fearn / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookpublishernewyorkmacmillan, booksubjectplantdis, bookyear1910
