Fungous diseases of plants . Fig. 77 rt. Alfalfa Leaf Spot. (Photograph by H. H. Whetzel) Pseudopeziza. In this genus the apothecium is formed beneaththe epidermis, which is later ruptured, and the mature fruit bodyis relatively simple in structure and shallow. The asci contain eightunicellular spores. XIII. ALFALFA LEAF SPOT Pseudopeziza Medicagiiiis (Lib.) Sacc. Combs, Robt. The Alfalfa Leaf Spot Disease. Iowa Agl. Exp. Sta. : 858-859. The alfalfa leaf spot is often very abundant both in Europeand America, and particularly injurious during rather dry seasons. 204 FUNGOUS DISEASES OF
Fungous diseases of plants . Fig. 77 rt. Alfalfa Leaf Spot. (Photograph by H. H. Whetzel) Pseudopeziza. In this genus the apothecium is formed beneaththe epidermis, which is later ruptured, and the mature fruit bodyis relatively simple in structure and shallow. The asci contain eightunicellular spores. XIII. ALFALFA LEAF SPOT Pseudopeziza Medicagiiiis (Lib.) Sacc. Combs, Robt. The Alfalfa Leaf Spot Disease. Iowa Agl. Exp. Sta. : 858-859. The alfalfa leaf spot is often very abundant both in Europeand America, and particularly injurious during rather dry seasons. 204 FUNGOUS DISEASES OF PLANTS. Fig. 77 b. Alfalfa defoliated byTHE Leaf Spot Fungus. (Photo-graph by H. H. Whetzel) Small sooty brown or black spotsabout -,V inch in diameter are 1 D produced, first evident on theupper surfaces of the leaves (). In these spots there appearlater in the season the relativelysimple, sessile apothecia, whichare formed beneath the epidermisand break through at spots are often very numer-ous, causing defoliation of manyof the leaves by the latter partof summer. These structures aresaucer-shaped, flat, and light incolor, at first fleshy in club-shaped asci bear eightunicellular colorless spores intwo series, measuring i o-14 /u. inlength. Paraphyses are also pres-ent. The mycelium is very localand confined to the area of thespots. This fungus is very closelyrelated to the species causing aleaf spot of clover, PseudopczizaTrifolii, and with this species itmay be identical. No practicalmethod of controlling this dis-ease has been developed. XIV. ANTHRACNOSE OF
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