. Some diseases of Puerto Rican forage crops. Forage plants Diseases and pests Puerto Rico. D (> Figure 3.—A, Rust on Cynodon dactylon (Bermuda grass) caused by Puccinia cyno- dontis. X B, Spores of P. cynodontis. X 528. C, Darluca filum, a fungus parasite of the rust fungi. X 8. D, Spores of D. filum. X 528. strongly toward each end. At either end are short appendages which are easily dislodged and diffi- cult to see. The spores are 14-18Ai x 3-4m {31, p. 166), The presence of Darluca filum is very likel}^ one of the factors that accounts for the seasonal cycle of rust on Gramineae in
. Some diseases of Puerto Rican forage crops. Forage plants Diseases and pests Puerto Rico. D (> Figure 3.—A, Rust on Cynodon dactylon (Bermuda grass) caused by Puccinia cyno- dontis. X B, Spores of P. cynodontis. X 528. C, Darluca filum, a fungus parasite of the rust fungi. X 8. D, Spores of D. filum. X 528. strongly toward each end. At either end are short appendages which are easily dislodged and diffi- cult to see. The spores are 14-18Ai x 3-4m {31, p. 166), The presence of Darluca filum is very likel}^ one of the factors that accounts for the seasonal cycle of rust on Gramineae in Puerto Rico. Of the grass hosts included in this study, all had their greatest rust infection during the dry, winter months. The hyperparasite, on the other hand, requires conditions of high relative humidity for its best development {14). Sprague {31) reports that rust attacks on lawn grasses in the Willamette Valley, Oregon, are checked by the parasit- ism of t). filum on the rust. Helminthosporium leaf spot Helminthosporium leaf spot of Cynodon dactylon (L.) Pers. (Ber- muda grass, hala que te quedas) is caused b}^ Helminthosjporium cyno- dontis Alarig. The disease was found in abundance onl}^ in areas of moderate to high rainfall (60 inches per year and above) and 5. 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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