New YorK AGRICULTURAL EXPERIMENT STATION. 
Plant lice — Continued. 
sion, 16, 477; repression, 16, 477; 
species prevalent in 1897, 16, 
482. 
nutrition, lines of work in, 15, 20, 
16, 15. 
Pathology, Department, work in, 16, 
18. 
protector, tests of, 8, 336. 
Plantains, composition, 7, 244. 
Planting and harvesting sugar beets, 16, 
198, 589. 
gooseberries, 15, 336, 337. 
Plants and soils, relations of, 14, 58; 
constituents of, 14, 37; ele- 
mentary .composition of, 14, 37; 
forms of nitrogen useful to, 14, 
43; preference shown by, for dif- 
ferent forms of food, 14, 89; re- 
lation of elements to fertilizers, 
14, 49. 
effect of shading, 23, 246. 
vigor as related to specific gravity 
of seeds, 28, 365. 
Plasmopara cubensis, 16, 345; damage, 
7; 69: nature, 16, 352; new 
host, 16, 433. 
(See also Cucumber downy mildew.) 
niticola. (See Grape downy mil- 
dew.) 
Platanus occidentalis, disease of, 15, 
457. 
Plats, comparison, with corn, 6, 30. 
comparison, with potatoes, 6, 26. 
experimental, variation, 2, 17. 
experimentation, unreliability, 6, 
26, 34. 
experiments, variation in duplicates, 
cee Tae 
tests, comparison of duplicates, 4, 
47-58. 
variation in, 7, 354. 
Platygaster parasitic on pear midge, 15, 
618. ' ry 
Plowing under green rye to prevent 
potato scab, 16, 18, 418. 
Plowrightia morbosa, notes on, 18, 452. 
(See also. Black knot.) ’ 
Plum, 10, 493. 
black-knot, observations on life his- 
tory, 12, 686. 
treatment, 9, 339. 
buds, effect of hydrocyanic acid gas 
on, 20, 279. 
curculio, remedy for, 14, 365. 
notes on, 8, 360, 14, 365, 18, 
454, 
diseases in the Hudson Valley, 18, 
211; notes on black, knot, 
18, 452; fruit rot, 18, 453; 
leaf-spot, 18, 454; yellows, 
18, 454. 
427 
Plum diseases, prevalence, 19, 200. 
fruit-rot of, 14, 364. 
insects, notes on curculio, 18, 454; 
green fruit worms, 18, 456; plant 
lice, 18, 456; remedies, 9, 345. 
leaf blight, 11, 659, 14, 365; blight, 
Marianna stocks, 11, 661; blight, 
Myrobolan stocks, 11, 660; dis- 
eases, potassium sulphide for, 6 
350; fungus, figures, 6, 348; fun- 
gus, notes on, 5, (276;..6,% 347° 
spot, 15, 384; spot, appearance, 
15, 389; spot, best time for treat- 
ment, 15, 3894; spot, bordeaux 
mixture for, 15, 384, 886; spot, 
eau celeste for, 15, 385; spot, ex- 
periments in treating, 15, 388- 
391, 396; spot, injurious effects 
15, 390; spot, injury by, 16, 210; 
spot, nature, 15, 388; spot, num- 
ber of sprayings required, 16, 
208; spot, prevalence, 16, 208; 
spot, results of treatment, 15, 
26; spot, treatment recommended, 
15, 386, 398, 16, 15, 207, 211. 
Lecanium, New York, 14, 574. 
nursery stock, preventing leaf 
blight, 12, 688. 
plant lice attacking, 16, 482. 
seale, 14, 575; classification and 
name, 14, 575; distribution of, 
14, 576; food-plants of, 14, 580; 
history, 14, 577; injury from, 
14, 582; life history of, 14, 582; 
natural enemies of, 14, 587; on 
nursery stock, 14, 581; reme 
dies for, 14, 590; spread of, 14, 
58]. 
stocks, Marianna, 
bolan, 11, 660. 
trees, analyses of, 10, 163: compo 
sition, 10, 163-1783; injury by un- 
known insects, 7, 229; plant food 
constituents used by, 24, 363. 
Plumb, C. S., appointment, 38, 11; As. 
sistant, 3, 3; reports as First Assist- 
ant, 4, 112, 5, 72, 6, 58; resignation, 
6, VII. 
Plums, amount of injury from leaf spot, . 
16, 210. 
and cherries, rotting, 4, 280. 
curculio on, 8, 360, 14, 365. 
effect of fali spraying on, 23, 215, 
2A S: 
lime-sulphur-salt wash on, 24, 
289, 292. 
fertilizers for, 14, 111. 
fertilizing materials contained in, 
14, 93. 
notes on, 15, 290. . 
plant food constituents in, 24, 373. 
thinning, 15, 379. 
11, 661; Myro 
