. Some diseases of Puerto Rican forage crops. Forage plants Diseases and pests Puerto Rico. become confluent and give the leaf ? an overall red cast. There are promment peripheral, clavate, or capitate paraphyses. The uredio- spores (fig. 17, B) are ellipsoid or oblong and measure 23-31^ x 29- 40/x. The spore wall is verrucose- echinulate, cinnamon or dark chest- nut-brown in color, and ^ to 2fi thick. There are 5-10 pores that are scattered or in zones (4, V' ^^^)' The pustules are frequentty parasitized b}^ Darluca filum. (See reference to parasitism of Puccinia cynodontis on Cynodon dact
. Some diseases of Puerto Rican forage crops. Forage plants Diseases and pests Puerto Rico. become confluent and give the leaf ? an overall red cast. There are promment peripheral, clavate, or capitate paraphyses. The uredio- spores (fig. 17, B) are ellipsoid or oblong and measure 23-31^ x 29- 40/x. The spore wall is verrucose- echinulate, cinnamon or dark chest- nut-brown in color, and ^ to 2fi thick. There are 5-10 pores that are scattered or in zones (4, V' ^^^)' The pustules are frequentty parasitized b}^ Darluca filum. (See reference to parasitism of Puccinia cynodontis on Cynodon dactylon for further discussion of rust infection, p. 4). 5/77 lit Loose kernel smut of Sorghum vulgare (sorghum, millo) (fig. 18, ^) is caused by Sphacelotheca cruenta (Kuehn) Potter. It has been found scattered throughout sorghum plantings. Both grain and forage 3ields may be reduced when fields are heavih' infected. One of the S3"mptoms is a dwarfed condition of the plant. Such plants are less than half as tall as unin- fected plants, and the}' head out early. When infected plants flower, usually all of the flowers in the head are smutted (fig. 18, B). The seed is replaced b}^ a dark mass of spores enclosed in a membrane. This covering is fragile and ruptures early. An elongate fungus structure known as a columella persists. Frequently the lemma and palea as well as the ovary contain smut sori. The floral bracts tend to elongate and proliferate. The sori are formed in the ovaries and floral bracts. The chlamy- dospores are enclosed in a fungal membrane composed of loosely joined, rounded-gray cells about twice the diameter of the spores. The chlamydospores are formed in elongated, irregular clumps, not spore balls, that separate as they mature. The spores (flg. 18, C) are round to elliptical, dark brown, and have indistinct pits or reticulations. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - colo
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Keywords: ., bookcentury1900, bookcollectionameri, bookcollectionbiodiversity
