Jan. 6-Mar. 31, 1923 
Index 
1013 
Page 
Conidia— 
dispersal methods. 262-270 
downy mildew of corn in Philippines, 
production and dispersal. 239-278 
Sclerosporas, Philippine, production and 
dispersal methods. 240-270 
Coniosporium gecevi, cause of cob rot of corn.. 498 
Coniothyrium diplodiellu, similarity to Schizo- 
parme straminea . 751-752 
Control of Lettuce Drop by the Use of For¬ 
maldehyde: Webster S. Krout. 645-654 
Convoluta spp., life history, relation to light 
and darkness. 872 
Com— 
development, soil temperature relation.. 849-850 
downy mildew, Philippine, conidia produc¬ 
tion and dispersal.239-278 
early vigor and yield, relation to seed infec¬ 
tion. 592-626 
ear rot, effect on plant vigor and yield of 
grain.604-619 
growth stages, pentosan distribution.657,658 
moldy ears, studies of causes.495-523 
parts, pentosan content at various stages 
of growth. 656-658 
Peruvian, growing experiments with day¬ 
light of different lengths. 874 
plant— 
aluminum and iron compounds, accumu¬ 
lation, relation to rootrots.801-824 
early vigor and yield of grain, influence 
of rot diseases... 583-630 
pentosans distribution. 655-663 
planting date, relation to development of 
seedling blight. 866-867 
plants, rootrot symptoms. 807-809 
rootrot, effect on plant vigor and yield of 
grain. 583-630 
rots— 
caused by parasitic internal fungi, inves¬ 
tigations. 495-522 
effect on plant vigor and yield of grain.. 583-630 
seed— 
coat, injury by iodin solution. 212-214 
content of iron and manganese.398,399 
seedling blight— 
development, influence of soil tempera¬ 
ture and moisture. 837-870 
symptoms. 839-840 
seedlings, action of various solutions of 
green sand on growth. 226 
stalk rot, effect on plant vigor and yield of 
grain. 583-630 
stalks, metal content, detection. 809 
Correlations between Various Characters of 
Wheat and Flour as Determined from Pub¬ 
lished Data from Chemical, Milling, and 
Baking Tests of a Number of American 
Wheats: Jacob Zinn. 529-548 
Corticium vagum — 
greenhouse studies on temperature # rela¬ 
tions. 761,768 
on potato, pathogenicity relation to soil 
temperature. 761-770 
Cosmos spp., growing,"experiments with day¬ 
light of different lengths. 875, 
879,883,887,899,901,902 909 
Cotton- 
growth and fruiting, influence of fertilizer 
containing borax. 433-444 
injury by borax in fertilizers.433-444 
inoculation with Fusarium vasinfectum, 
experiments.390-391 
irrigation, relation to boll shedding and 
yidd. 939-945 
overwatering, indications. 943 
Pima, summer irrigation.927-946 
Cotton, Richard T.: Aplastomorpha vandinei. 
Tucker, an important Parasite of Sttophilus 
oryza-Lt . 549-556 
Cotton Rootrot in Arizona: C. J. King.525-527 
Cotton Wilt, a Seed-borne Disease: John A. 
Elliott. 387-394 
Crocker, William, and Harrington, George T.: 
A new and Efficient Respirometer for Seeds 
and Other Small Objects; Directions for 
Its Use. 101-116 
Page 
Crocker, William, and Harrington, George T.: 
Structure, Physical Characteristics, and 
Composition of the Pericarp and Integu¬ 
ment of Johnson Grass Seed in Relation to 
Its Physiology. 193-222 
Cucurbits, seed-germination temperatures, 
notes.,.324.326-329 
Cultivation, effect on soil moisture, compari¬ 
son with mulches. 729, 734~737 
Cuttings— 
infested, downy mildew spread. 271-273, 277 
rooting by means of humidity and high 
temperature. 233 
Cypress vine, growing, experiments with day¬ 
light of different lengths. £79 
Cytological Study of Infection of Baart and 
Kanred Wheats by Puccinia graminis tri-- 
tici: Ruth F. Allen.. 131-152 
Dahlia, growing, experiments with daylight of 
different lengths. 876,893 
Damping-off, caused by Sclerotium rolfsii ,... 41, 
42,43,44 
Davidson, Jehiel, and Le Clerc, J. A.: Effect of 
Various Inorganic Nitrogen Compounds, 
Applied at Different Stages of Growth, on 
the Yield, Composition, and Quality of 
Wheat. 55-68 
Day, length, relation to plants, further studies 
in photo-periodism. 871-920 
Daylight— 
reduction by use of dark chambers.871,873 
supplement by use of electric light ...... 871,873 
Determination of Starch Content in the Pres¬ 
ence of Interfering Polysaccharids: George P. 
Walton and Mayne R. Coe.995-1006 
Dewberry, blackrot fungus, pycnidia cavities, 
formation. 745"748 
Dextrose fermentation— 
effect of aeration. 669-670 
relation to nitrogen fixation.670-676 
Dicentrine, alkaloid in BikukuUa spp— 71, 72,73 
Dickson, James G.: Influence of Soil Tem¬ 
perature and Moisture on the Development 
of the Seedling-Blight of Wheat and Com 
Caused by Gtbbeiella saubinetii .837-870 
Diplodia — 
spp., parasitic fungi of seed com.496-497 
zeae — 
description and habits. 496, 
497 . 505-506. 507-518, 520-521 
fungus affecting com ears. 604,619 
Disease, resistance, relationships, and inheri¬ 
tance. 446-453 
Disinfection, soil, for control of wheat rosette, 
experiments. 782-783 
Distribution of Pentosans in the Com Plant at 
Various Stages of Growth: John H. Ver 
Hulst, W. H. Peterson, and E. B. Fred.. 655-663 
Dodge, B. O.: Origin of the Central and Ostio- 
lar Cavities in Pycnidia of Certain Fungous 
Parasites of Fruits. 743-760 
Dogs, anthelmintics, tests of carbon tetra- 
chlorid. 168-171 
Dormancy, plant, relation to length of day¬ 
light.905-908,919 
Downy mildew on com, Philippine, conidia 
studies.239-278 
Downy Mildew on Lettuce in California: D. G. 
Milbrath...989-994 
Draeculacephala mollipes, carrier of mosaic 
disease. 281-283 
Drop, lettuce, control by formaldehyde.... 645-654 
Dry farming, cultivation to preserve soil 
moisture. 736,739 
Dungan, George H., Holbert, J. R., Burlison, 
W. L., Biggar, H. H., and Koehler, B., and 
Jenkins, M. T.: Early Vigor of Maize 
Plants and Yield of Grain as Influenced by 
the Cora Root, Stalk, and Ear Rot Dis¬ 
eases. 583-630 
Dutchman’s breeches, poisonous properties. 69-78 
Early Vigor of Maize Plants and Yield ot 
Grain as Influenced by the Com Rpot, Stalk, 
and Ear Rot Diseases: James R. Holbert, 
W. L. Burlinson, H. H. Biggar, B. Koehler, 
G. H. Dungan, and M. T. Jenkins.583-630 
Earworm, com, injury to ears, and subse¬ 
quent rotting..604,619,627 
