. Bulletin. Landwirtschaft - New Hampshire. 128 N.H.-AGR. EXPERIMENT STATION [Bulletin 144 KRONE GALL. Pseudomonas tumefaciens. Erw. Smith und Townsend. Krone Gall ist der Begriff zu abnormen Auswüchse in der Nähe der Oberfläche des Bodens in der Region der Kragen. Es tritt auf praktisch alle Stein, pomaceous und Bush Früchte. Bei den meisten dieser Anlagen die Krankheit nachgewiesen worden, ansteckend zu sein. Versuche, die Krankheit durch die Impfung auf gesunden Apfelbäume zu produzieren, haben in der Regel erfolglos. Betroffen sind Apple Bäume sollten mit Argwohn betrachtet werden, jedoch, und mit großer Sorgfalt zu verwerfen

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. Bulletin. Agriculture -- New Hampshire. 128 N. H. AGR. EXPERIMENT STATION [Bulletin 144 CROWN GALL. Pseudomonas tumefaciens. Erw. Smith and Townsend. Crown gall is the term applied to abnormal outgrowths near the surface of the soil in the region of the collar. It occurs on practically all the stone, pomaceous and bush fruits. With most of these plants the disease has been proven to be contagious. Attempts to produce the disease by inoculation on healthy apple trees have usually been unsuccessful. Affected apple trees should be regarded with suspicion, however, and great care taken to reject all diseased plants at the time of transplanting. The dis- ease usually does the greatest damage on nursery stock. EUROPEAN APPLE CANKER. Nectria ditissima Tul. This disease is reported as serious in the orchards of Europe, and is apparently be- coming widely distributed in America. It is not of so common occurrence in New Hampshire as the black rot canker, but is more destructive where found. The fungus seems to be dependent upon wounds for entrance to the host tissue. It attacks the inner bark and the cambium, and to some extent the young wood. The mycelium is perennial in the host. As the new growth develops around the wound it is attacked and killed by the fungus; thus a series of ridges may be developed, giving a charac- teristic appearance to the disease (Fig. 26). Two kinds of summer spores are pro- duced, the first small and unicellular, the sc-cond sickle-shaped and having three or more cells. The latter are probably largely responsible for the spread of the disease during the summer. In the spring compact clusters of red lemon-shaped perithecia may be found near the edge of the canker. These may be seen with. Fio. 26.— European Apple Canker.. 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 work.. New H

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