124 A PLANT-DISEASE SURVEY IN TEXAS. 



Page. 



Peronosporacege, conditions affecting germination of spores 22 



Persimmon, culture and diseases in Texas 19, 30-31, 110, 111 



Mexican, diseases in Texas 31, 110 



Pestalozzia spp., occurrence on plants in Texas , 65, 78 



Pestalozziella yuccae, occurrence on the yucca in Texas 106 



Petroselinum sativum. See Parsley. 

 Phaseolus spp. See Bean. 



Plileospora spp., occurrence on plants in Texas 66. 79, 81, 104, 110, 111 



Phoenix dactylifera. See Palm, date. 



Phoma sp., occurrence on young citrus plants in Texas 27 



Phomatospora, occurrence of pycnidium in Texas 66 



Phoradendron flavescens. See Mistletoe. 



Phragmidium disciflorum, occurrence on rose in Texas 88 



Phragmites vulgaris. See Grass, reed. 

 Phyllachora graminis. See Black-blotch. 



Phyllosticta spp. . occurrence on plants in Texas 31. 



32, 60, 61, 65, 67, 70. 77. SO, 82, 93-94, 98-99. 102, 110 

 Physalis sp. See Cherry, ground. 



Physiography, character of region studied in Texas 12-14 



Physopella fici, occurrence on the fig in Texas 26 



Phytolacca americana. See Pokeweed. 



Pigweed, diseases in Texas 99 



Pileolaria toxicodendri, occurrence on poison oak in Texas 76 



Piricularia giisea. See Gray-spot. 



Pisum sativum. See Pea. 



Plant, century, diseases in Texas 84, 110, 112 



disease survey. See Survey, plant disease. 



indigo, diseases in Texas 97 



Plants, fiber. See Cotton. 



ornamental, diseases in Texas 82-89 



See also names of different ornamental plants. 



wild, diseases in Texas 90-106 



See also names of different wild plants. 



Plasmopara viticola, occurrence on the grape in Texas 33 



Platanus occidentalis. See Sycamore. 



Plates, description 109-112 



Platyopuntia, native ihicket growths in Texas 22 



Plum, culture and diseases in Texas 19, 25, 28-29, 31-32, 111 



pockets, nonoccurrence of disease in Texas 19 



Podosphaera leucotricha, occurrence on the apple in Texas 25 



Poison oak. See Oak. poison. 



Pokeweed, occurrence of leaf-spot in Texas 99 



Polygonum spp. See Knotweed. 



Pomegranate, occurrence of leaf-spot in Texas 76-77, 109 



Populus deltoides. See Cottonwood. 

 Portulaca spp. See Purslane. 



Potato, Irish, culture and diseases in Texas 20, 23, 42, 111 



sweet, diseases in Texas 44, 98 



Powdery mildew. See Mildew, powdery. 



Prairie, coast, physiography and soils in Texas 12-14 



Prantl, K., and Engler, A., on diseases of plants 66, 108 



Precipitation, annual, for region studied in Texas 15-16 



Prickly ash. See Ash, prickly. 

 226 



