INDEX. 123 



Page. 



Nematodes, occurrence on plants in Texas 20, 23 



See also Root-knot and Tylenchus. 



Nettle, bull, occurrence of leaf-spot in Texas 91 



horse, occurrence of leaf-spot in Texas 96 



Nicotiana repanda. See Tobacco, wild. 



Nymphaea ad vena, occurrence of leaf-spot in Texaa 98-99 



Oak, diseases in Texas 74-75, 111 



live, occurrence of tar-spot in Texas 75, 111 



poison, occurrence of rust in Texas 76 



Oats, culture and diseases in Texas 21, 47 



Observations, field, importance 23 



Oenothera laciniata. See Primrose, evening. 



Okra, culture and diseases in Texas 20, 23, 41, 55 



Oleaster, occurrence of leaf-spot in Texas 75, 110 



Onion, growth as truck crop in Texas 20 



Oospora scabies, occurrence on potato in Texas 42 



Opuntia spp. See Pear, prickly. 



Orange, culture and diseases in Texas 19, 27-28, 109 



Osage, diseases in Texas 75, 110 



Satsuma, cultivation in Texas 19 



Organisms, causal, value of field observations in identification 23 



Ornamental plants. See Plants, ornamental. 



Orton, W. A., assistance in preparation of bulletin 11 



Ovularia maclurae, occurrence on Osage orange in Texas 75 



Oxalis stricta. See Sorrel, wood. 



Ozonium omnivorum, occurrence on plants in Texas 26, 38, 41, 48, 49, 55, 57, 59, 80 



Palm, date, culture and diseases in Texas 19, 25, 111 



Panicum spp., culture and diseases in Texas 21, 52 



Parish, S. B., on identity of Cercospora species 87 



Parkinsonia aculeata. See Retama. 



Parsley, diseases in Texas 41, 55 



Parsnip, diseases in Texas 41 



Parthenium hysterophorus, occurrence of rust in Texas 99 



Pastinaca sativa. See Parsnip. 



Patterson, F. AV., assistance in determination of species 11 



Pea, black-eyed. See Cowpea. 



culture and diseases in Texas 20, 41 



sweet, host of dodder in Texas 89 



Peach, culture and diseases in Texas 18, 19, 25, 28-29 



freckle. See Freckle, peach. 



Peanut, diseases in Texas 49, 109 



Pear, culture and diseases in Texas 18, 29-30 



prickly, diseases in Texas 100-101 



Pecan, culture and diseases in Texas 20, 75-76, 111 



Peck, C. H., determination of species 11, 74, 95, 108 



Pelargonium sp., occurrence of bacterial leaf-spot in Texas 86, 112 



Pepper, culture and diseases in Texas 20, 41^2, 110 



sweet, occurrence of fruit-spot in Texas 42 



Peppergrass, occurrence of downy mildew in Texas 99 



Perisporium wrightii. See Black-spot. 



Periwinkle, host of dodder in Texas 87 



Peronospora parasitica, occurrence on plants in Texas 44-45, 99 



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