1056 
Journal of Agricultural Research 
Vol. XXIV 
Plum— Page 
Marianna, immunity to peach rosette. 307r3ii>3i5 
trees, budding with rosetted peach buds, 
results. 308,309-314 
wilt, relation to formation, notes.2 27,229 
Pollen, in upper air, distribution studies... 600-602 
Poncirus trifoliata, susceptibility to citrus 
scab, notes.956-959 
Porte, W. S., and Pritchard, Pred J.: Watery- 
Rot of Tomato Fruits.895-906 
Potato decoction, testing for pectinase pro¬ 
duction. 864-865,870 
Potassium salts, effect on plant growth in 
presence of other salts.327-331 
Potato— 
environment, effect on phloem necrosis.. 240-241 
leaf roll, relation to phloem necrosis. 243-245 
phloem necrosis— 
after external injury. 241-242 
occurrence and significance. 237-246 
stem streak, relation to phloem necrosis.. 242 
tubers, Fusarium species identification.. 339-364 
Prairies, soils and vegetation, studies. 104,164 
Pritchard, Fred J., and Porte, W. S.: Watery- 
Rot of Tomato Fruits.895-906 
Protein Synthesis by Azotobacter: 
O. W. Hunter. 263-274 
Protein— 
feeding value, literature cited. 977-978 
mixtures from «>m and various concen¬ 
trates, nutritive value.... 971-978 
percentage of wheat, oats, and barley, effect 
of respiration. 1041-1048 
wheat, oats, and barley, percentage, effect 
of respiration upon. 1041-1048 
Prune decoction, testing for pectinase pro¬ 
duction. 864-865 
The Pseudo-Antagonism ci Sodium and 
Calcium in Dilute Solutions: H. S. Reed 
and A. R. C. Haas. 753-758 
Puccinia — 
glumarum, life history of. 607-620 
graminis — 
avenae^ inoculation of oats, experi¬ 
ments.. 1012-1017 
biologic forms— 
on varieties of Arena spp. 1013-1018 
study of comparative morphology... 539-568 
durum wheat resistance, inheritance 
^ mode.979-996 
literature cited. 1017-1018 
spore formation discussion. 89x 
frthW, resistance to.. 457-479 
Pucciniastrum americanum, morphology and 
host relations. 885-894 
spp., host relations.885-894 
Quack grass, injury by Heltninthosporium 
spp. 1923 (O-306).642,667-670,675-677 
Pythiacystis citrophthora, cause of citrus gum- 
mosis, and control. 191-213,226,228,231 
Radishes, growing in manganese soils, experi¬ 
ments. 784,786,787 
Raspberry, injury by Pucciniastrum ameri¬ 
canum . 885-894 
Rats, feeding experiments with milk and vel¬ 
vet beans. 434-439 
Reaction, soil, on Azotobacter, changing, 
rffectof. 289-296 
Read, J.W.: Nutritive Value of the Georgia 
Velvet Bean (Stizilobium deeringianum) .. 433-440 
Redtop, stem rust, study of biologic form.. 539-568 
Reed grass, wood, injury by Helminthospor- 
ium catmarium . 67o-ti72 
Reed, H. S., and Haas, A. R. C.:— 
Growth and Composition of Orange Trees in 
Sand and Soil Cultures. 801-814 
The Pseudoantagonism of Sodium and 
Calcium in Dilute Solutions. 753-758 
Relation of Certain Soil Factors to the Infec¬ 
tion of Oats by Doose Smut: Dudlle K. Bar- 
■ tholomew, and Edith Seymour Jones... 569-575 
Relative Susceptibility of Citrus Fruits and 
Hybrids to Cladosporium citri Massee: G. 
L. Peltier and W. J. Frederich.955-960 
Respiration, effect on protein percentage of 
wheat, oats, and barley... 1041-1048 
Rhizopus— Page 
nigricans, cause of sweet potato softrot, 
limitations.441,445-456 
temperature limitations. 1-7,9; 31-39 
spp.— 
causing decay of sweet potatoes.441-456 
eleven, spore ^rmination, growth, and 
fruiting, studies. 1-40 
growth, control by temperature, graphs.. 8-30 
temperature relations. 1-40 
triiici, cause of sweet potato softrot, 
limitations.441,445-456 
pectinase production, relation to acidity, 
studies. 861-876 
Rice— 
chlorosis, relation to nitrogenous ferti¬ 
lizers. 621 646 
leaf spot, cause, description, and control.,.. 643, 
724-728 
Rickards’ solution, use in pectinase studies, 
formula. ^2-865 
Rocky Mountain trees, physiological require¬ 
ments. 97-164 
Rogue type, garden peas, inheritance 
studies.815-852 
“Rogues,” garden pea, literature cited.___ 852 
Roots, plant, excretion of organic adds. 622 
Rosette, peach— 
infectious mosaic.307-316 
transmission to other fruits, experiments. 308-314 
Rot— 
sweet-potato, organism produdng, studies 861-877 
watery— 
of tomato fruits.895-906 
tomato, a form of Oospora lactis, nature 
and action. 895-906 
Rots— 
fungous, temperature relations, studies and 
literature dted. *.39-40 
parasitic, literature dted.905-906 
sweet potato, causes, studies.441-456 
Rubus strigosus, native host of Puccineas- 
trum americanum .885-887,888,893 
Rust- 
grain, biologic forms, statistical study... 539-568 
incubation period, studies. 613 
orange, raspberry injtuy.885-894 
resistance by Marquis-Kota wheat cross, 
study...997-1012 
spcra dissemination in upper air.600-605 
stripe- 
life history studies.607-620 
resistance to drying.61^x2 
viability, winter and summer, studies... 607- 
6x0,612 
Rusts, literature dted. 893*-894 
Rye— 
injury by Helminthosporium sativum. 694-700,704 
stem rust, study of biologic form.539-568 
Saltbush, Australian, analysis sodium cklorid 
abscxption. S 3 
Sand, plants growing with and without man¬ 
ganese, experiments. 79i*'79a 
Sap density, relation to transpiration rates, 
studies. *3*-'*45 
Satsuma oranges, susceptibility to dtrus 
scab, notes.956-958 
Scab, citrus, susceptibility of dtrus fruits and 
hybrids... 9 S 5“959 
Scald apple— 
comparison with internal browning.i 78-*79 
weather relations... 959 
SclerosPora graminicola, cause of millet 
downy mildew. 854 
oospores, treatment experiments. 854-855 
Scales, onion, extract, effect of White, Red, 
and Yellow, on smudge fungus... 1026 
Sclerotinia Hbertiana, cause d dtrus gum- 
mosis.;.220-221, 229, 231 
Seed— 
cabbage, varietal resistance to Fusarium 
disease.64-67,69-73 
color, durum wheat crosses, relation to re¬ 
sistance to Puccinia graminis . 979-996 
conifer, germination and growth habits, 
notes. I 57 -XS 9 
