CABBAGE DISEASES. Cabbage is subject to two parasitic diseases, both of which are often very destructive. The first of these is clubroot, due to a low fungus. Plasmediephera bressiece, which causes peculiar swellings and outgrowths from the of the cabbage, often the whole root system being involved. (See CIA:DROOT. ) The other disease is a brown or black rot caused by attacks of bacteria, Pseudemenas compestris. It has been known in the United States for a dozen years. and has become widely distributed. It is known to occur also in the west of Europe. and is a destructive disease. often devastating whole fields. The disease attacks the cabbage at any stage of growth and often dwarfs the heads or makes them one-sided. If seven, no heads are formed, and the whole plant may be killed. Fre quently the heads rot and fall off, but this is due to other agencies than the disease itself.
Cut stumps of diseased cabbage show brown or black rings, and these may be traced into the head. On the leaves the margins become yellow and the veins blaek. The disease seems to enter by the leaves and progresses toward the stem. In many cases the leaves fall off, leaving bare stumps. The disease attacks, in addition to cab bage. turnips, cauliflower, kale, and rape. On the turnip it causes an internal brown rot. It seems to gain entrance through the gnawing of insects, slugs, etc. It remains in the soil for some time, just how long is not known, and is spread through manure and rubbish. For reme dial measures it is advised to rotate the crop, destroy all cabbage insects, pay strict attention to the seed-bed, and plant on new soil whenever possible.