66o 



Journal of Agricultural Research 



voLxin 



Page 



vNitrogen, nitric, changes in manured soil. . 180-187 



Oats. See A~ena saliva. 



Oidium lactis, relation to cheese ripening. . 230-232 



Oil- 

 ethereal, isolation from Gossypium hir- 



sutum 349-351 



olive — 



character of decomposition 362-363 



effect of air on 356-364 



effect of moisture on 356-364 



organoleptic changes in 356-358 



production of aldehyde in 364 



stability 353-366 



See Oil, olive. 



Onion. Set AUiuTti cepa. 



Osmotic presssure of soil solution, effect of 

 dried blood on 216-223 



Osner, G. A. (paper); Stemphylium Leafspot 

 of Cucumbers 295-306 



Overwintering of the House Fly (paper). . . 149-170 



Oxalic acid. See Acid, oxalic. 



Oxygen, relation to growth of Marssonina 

 panattoniana 277 



Peach. See Amygdalus persica. 



Peach moth, oriental. See Laspeyresia 

 molesta. 



Pear. See Pyrus spp. ^ 



Peat, in Everglades — 



comparison with Cladium effusum 607-609 



composition 606-607 



description 606-607 



Penicillium roqueforti, in Roquefort cheese. 230-232 



Penicillium spp., isolation from soil. . 93-95, 230-232 



Periconia byssoides, isolation from soil 95 



Phaeogenes sp., parasite of Laspeyresia molesta 70 



Phaseolus vulgaris — 



effect of boron- treated manure on 458 



sunscald of 647-650 ■ 



Phenoco, effect on infectivity of mosoic 

 virus 625-626 



Phomopsis kalmiae — 



biochemical characters 206-207 



causal organism of leafblight of Kalmia 



latifolia 199-212 



cultural characters 204-205 



description 210-211 



effect on leaf tissues 203-204 



germination 206 



inoculations by 201-203 



isolation 200-201 



mode of entrance 204 



morphology 207-210 



n. sp 211 



physical characters 206-207 



taxonomy 207-210 



Phosphoric acid. See Acid, phosphoric. 



Pig- 

 basal katabolism of 52-54 



dissemination of hog cholera by 102-125 



See also Hog. 



Pigeon, relation to dissemination of hog- 

 cholera 125-129 



Phyllosiicia medicaginis, syn. prenopeziza 

 medicaginis. 



Physical Properties Governing the EfBcacy 

 of Contact Insecticides (paper) 523-338 



Pit— Page 



disease of Ipomoea batoias 437-450 



See also Pox. 



Plecoptera injurious to vegetation 37-42 



Plum. See Prunus spp. 

 Poplar. See Populus spp. 

 Populus spp. — 

 canker of — 



causal organism 333 



description 331-333 



dissemination 336-337 



host plant of Cytospora chrysosperma 333-344 



Portheiria dispar, bacterial disease of — 



symptoms of characteristics 515-516 



pathology 518-519 



symptoms S15-516 



Potassium chlorid, ammonification of dried 



blood in soils with 219, 221-222 



permanganate, effect on infectivity of 



mosaic virus 624 



Potato- 

 Irish, see Solanum tuberosum. 

 sweet. See Ipomoea batatas. 

 Pox— 

 of Ipomoea batatas — 

 association of Actinom,yces spp. with. . . 445-557 



caused by CyiosPora batata 440 



causal organism of 440-442 



contol 447-448 



dissemination 442-443 



economic importance 439 



geographic distribution 438 



nomenclature 438 



relation to storage 443 



symptoms 439-440 



of Solanum tuberosum, causal organism. . 443-444 



susceptibility of Beta vulgaris to 444 



susceptibility of Brassica rapa to 444 



susceptibility of l.ycopersicon esculentum to 444 

 Pox, or Pit (Soil Rot), of the Sweet Potato 



(paper) 437-450 



Pratt, O. A. (paper): Soil Fungi in Relation 

 to Diseases of the Irish Potato in Southern 



Idaho 73-100 



Prunus spp. — 



food plants of Laspeyresia molesta 60 



food plants of Taeniopteryx spp 38-39 



inoculation experiments with Coccomyces 



spp., from 539-569 



Puccmia graminis — 



secalis, inoculations with 651-654 



iritici, inoculations with 651-654 



tntici-armpacti, inoculations with 651-654 



Pyrenopeztza viedicaginis — 

 causal organism of yellow-leafblotch of 



alfalfa 307-330 



control 328 



distribution 327-328 



life history 326-328 



mode of peneration of host by 327 



morphology 312-315 



overwintering 326-327 



pathogenicity 323-328 



physiology 31S-323 



synonomy 310-312 



Pyrus spp., food plants of Laspeyresia molesta. 60 

 QuercimeritrLn, isolation from Gossypium sp. 346-349 



