July i-Sept. 30,1918 
Index 
619 
Page 
Phsidole megacephala Fabricius, native para¬ 
site of fruit pests in Hawaii. 608 
Phoma sp. t causal organism of stem lesions of 
Solatium tuberosum. .. 216-219 
Phthorimaea operculella, female, at light traps 
. * 45 >148 
Piemeisel, F. J., et al. (paper): Can Biologic 
Forms of Stem rust on Wheat Change Rap¬ 
idly Enough to Interfere with Breeding for 
Rust Resistance ?. 111-123 
Pig, toxicity of cottonseed products to.443-449 
Pine. See Pinus spp. 
Pinon Blister-Rust (paper).411-424 
Pi 11 on. See Pinus edulis; Pinus monophylla. 
Pinus — 
edulis , host plant of Cronartium occidentals 
. 411-434 
monophylla , host plant of Cronartium occi¬ 
dentals . 411-424 
spp.— 
resemblance of damping-off to whitespot. 595 
stem lesions caused by bending.601-602 
stem lesions caused by heat. 595 
whitespot disease of. 595-603 
Pisum spp., silage of, acidity.400-409 
Plains, Great, See Great Plains. 
Plant, rutaceous, susceptibility to Citrus- 
canker. 340-344 
Plastnodiophora brassicae — 
galls, comparison with Spongospora sub- 
terranea . 567-568 
histology of club caused by. 557-561 
infection of young roots by. 561-562 
morphology of club caused by. 546-547 
nature of infection by. 545-546 
parasite of Brassica oleracea . 543~573 
passage through host tissues... 554-556 
production of branch roots and shoots 
caused by. 556-557 
relation to host tissues.. 563-567 
stages in club formation caused by... 547-554 
time of infection by. 545-546 
tissue invasion by. 543-573 
Plasmodiophoraceae, tissue invasion by... 543-572 
Plummer, J. K. (paper): Availability of Pot¬ 
ash in Some Common Soil-Forming Min¬ 
erals—Effect of Lime Upon Potash Ab¬ 
sorption by Different Crops.297-316 
Plutslla maculipennis, female, at light traps. 146,148 
Poa pratensis, resistance of seeds of to desicca¬ 
tion. 526-532 
Podspot of Abdmoschus esculenius — 
cause. 208-210 
description. 208 
origin. 207-208 
Poisoning, cottonseed. 425-452 
Pclia renigera , female, at light traps. 136-141 
Poncirus trifoliaia — 
overwintering of Citrus-canker organism 
in. 523-524 
resistance to Citrus-canker. 342 
Poplar. See Populus spp. 
Populus — 
balsamifera, food plant of Pemphigus populi- 
iransversus . 580-581 
Page 
Populus —Continued 
dsltoides — 
food plant of Pemphigus populi-transxer- 
sus . 580-592 
formation of galls on. 581 
percentage of leaf petioles showing galls.. 582 
monilifera — 
food plant of Pemphigus populbtransver- 
sus . 580-581 
syn. Populus deltoides. 
spp., occurrence of galls in. 577-594 
Portketria dispar , female, at light traps. 147,148 
Potash- 
solubility in soils, effect of gypsum on. . 61-66 
See Potassium. 
Potassium- 
availability in soil-forming minerals. 297-316 
phosphate, requirement for buckwheat in 
culture solutions. 151-175 
sulphate, availability of potash in. 297-316 
Potato— 
sweet. See Ipomoea batatas. 
See also Solanum tuberosum. 
Potato-Stem Lesions (paper). 213-220 
Poultry, effect of cottonseed products on- 
egg production. 441-442 
growth. 438-442 
Propionic add, occurrence in silage. 406-408 
Prunus Spp., food plant of Euproctis chrysor - 
rhoea . 191-192 
Pseudomonas citric inoculation of Citrus 
plants with. 337-35 7 
Psidium— 
cattleianum, food plant of Ceratitis capitata 606-608 
guajava, food plant of Ceratitis capitata. .. 606-608 
Pucdnia — 
dispersa Erikss., reference to Ward's 
study of. 112 
glumarum Erikss. and Henn., resistance in 
wheats to, a recessive Mendelian character. 112 
graminis Pers., whether bridging hosts can 
be used with, to infect plants normally 
immune. na 
tritici — 
effect of wheat hybrids on. 117-121 
inoculations with. 117-121 
Pyrus communis, food plant of Euproctis 
ckrysorrhoea . 191-192 
Quercus Spp., food plant of Euproctis ckry¬ 
sorrhoea . 191-192 
Rabbit— 
susceptibility to cocddioidal granuloma . 536-538 
toxidty of cottonseed products to. 435-438 
Rape. See Brassica napus. 
Rat— 
recovery of trypanosomes from blood of.. 573-576 
toxidty of cottonseed products to.429-435 
Resistance of Seeds to Desiccation (paper).525-552 
Reynolds, F. H., and Schoening, H. W. 
(paper): An Improved Method for Recover¬ 
ing Trypansomes from the Blood of Rats 
for Antigen Purposes in Connection with 
Complement Fixation. 573-576 
Rhizoctonia spp., casual organisms of stem 
lesions of Solanum tuberosum . 213,220 
