. Some diseases of Puerto Rican forage crops. Forage plants Diseases and pests Puerto Rico. Figure 11.—Ergot on Paspalum ylicatulu m (brownseed paspalum) caused by Clavi- ceps paspali. X 3. are 5/x x 15/x in size. The oval perithecia completely cover the stromatic head. They are 340/x x 119/x in size. The asci are cylin- drical and are 174^ long. The ascospores are filiform. Their meas- urements are 101m x ^ {S3). The exudate of the sphacelial stage is high in carbohydrate and other fungi grow upon it saprophy- tically {19, p. 613). In Puerto Rico, these are frequently: Cerehella andropog
. Some diseases of Puerto Rican forage crops. Forage plants Diseases and pests Puerto Rico. Figure 11.—Ergot on Paspalum ylicatulu m (brownseed paspalum) caused by Clavi- ceps paspali. X 3. are 5/x x 15/x in size. The oval perithecia completely cover the stromatic head. They are 340/x x 119/x in size. The asci are cylin- drical and are 174^ long. The ascospores are filiform. Their meas- urements are 101m x ^ {S3). The exudate of the sphacelial stage is high in carbohydrate and other fungi grow upon it saprophy- tically {19, p. 613). In Puerto Rico, these are frequently: Cerehella andropogonis (fig. 7, D, E); Clado- sporium sp. (fig. 7, F, G); Fusarium sp. (fig. 7, H), and yeasts. (See reference to parasitism of Claviceps maximensis on Panicum maximwn Var. Common Guinea for further discussion of ergot infection, p. 9). Physoderma leaf spot Ph3^sodermaleaf spot of Paspalum plicatulum (brownseed paspalum, gramalotillo) is caused by Physo- derma paspali Stevenson. This disease has been observed on gra- malotillo wherever it was gro\vnj chiefl}^ during the rainy season. During these periods it was abund- ant but did not appear to have caused appreciable ? Figure 12.—A. Leaf spot on Paspalum plicatulum (brownseed paspalum) caused by Physoderma paspali. X B. Spores of P. paspali. X 528. The lesions (fig. 12, A) are found on both sides of the leaf most com- monly near the juncture of the blade with the sheath. They are 14. 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 Theis, Thomas. Federal Experiment Station of the United States Dept. of Agriculture
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