Ce texte agricole traite des Thallophytes et de la maladie des racines de club chez les plants de chou, causée par un Myxomycète parasite. La maladie affecte les racines et les tiges, empêchant la croissance du chou et conduisant souvent à la mort des plantes.
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. Botany for agricultural students . Botany. 340 THALLOPHYTES Club Root of Cabbage.' — This is a disease of Cabbage caused by a parasitic Myxomycete. The Myxomycete gains entrance through the roots and hves upon the cells of the plant. The presence of the parasite causes the wart-like developments on the roots and stem of the Cabbage, and so injures the plant that no head is produced and even death often results {Figure 292). Within the cells of the Cabbage the plasmodia live and form spores {Figure 293). When liberated through the decay of the Cabbage, the spores are carried by water, animals, or wind to other plants. The spores may lie in the ground and infect plants in succeeding years. This dis- ease is not only destructive to Cabbage but often at- tacks Turnips, Radishes, Rutabagas, and Cauli- flower. The important fea- ture in controlling the disease consists in prevent- by burning infected plants, sulphur, and rotation of. Fig. 293. — Cross section of a root of Cabbage affected with Club Root, showing the plasmodia (p) within the tissues. From Woronin. ing the spores from functioning treating the soil with lime or crops. Powdery scab of the Irish Potato.^ — This disease is caused by one or more kinds of Myxomycetes which enter the tubers and roots of the Irish Potato and destroy the tissues {Fig. 294). The Amoeba-like plasmodia live in the cells, which, due to the presence ' Cabbage Club Root in Virginia. Bulletin 191, Virginia Agr. Exp. Sta., 1911. Studies on Club Root. Bvlletin 176, Vermont Agr. Exp. Sta., 1913. Studies on Clubroot of Cruciferous Plants. Bvlletin 387, Cornell Uni- versity Agr. Exp. Sta., 1917. ' Powdery Scab (Spongospora subterranea) of Potatoes. Bvlletin 82, U. S. Dept. Agr., 1914. Powdery Scab of Potatoes. Bulletin 227, Maine Agr. Exp. Sta., 1914. Spongospora subterranea and Phoma tuberosa on the Irish Potato, Vol. 7, No. 5, pp. 213-254, Jour. Agr. Research, U. S. Dept. Agr., 1916.. Please note that these images are extracted from s
