470 



PLANT DISEASES 



Oak, ii6, 162, 172, 178, 193, 197, 

 198, 285, 348. 



canker, 112. 



seedling disease, 121. 



Oats, 247. 



loose smut of, 210. 



Olive tuberculosis, 341. 

 Onion mildew, 75. 



scab, 273. 



sclerotinia, 156. 



smut, 223, 



Onions, 326. 

 Onobrychis satlva, 155. 

 Orange, foot-rot of, 3. 



scab, 310. 



sooty mould of, 100. 



Paeony, drooping disk as e of, 157. 



Pandanus disease, 293, 344. 



Panicum, 331. 



Paris quadrifolia, 224. 



Paspalum, 331. 



Pea seedling blight, 315. 



■ spot, 275. 



Peach, 83, 115, 251, 276, 282, 317. 



rosette, 347. 



Pear, 115, 193, 268, 276, 282. 



leaf blister, 90. 



cluster-cups, 257. 



scab, 304. 



Peridermium orientale, 267. 

 Petunia, 151. 

 Phaseolus lunatus, 65. 



■ vulgaris, 275. 



Phleum pratense, 249. 

 Picea, 182. 



■ morunda, 267. 



sitkaensis, 163. 



Pine, 116. 



blister-blight, 235. 



branch twist, 235. 



cone fungus, 263. 



cluster-cups, 261. 



leaf-cast, 139. 



fungus, 113. 



Pink rust, 253. 

 Pinks, 319. 

 Pinus, 182. 



contorta, 264. 



densifiora, 267. 



excelsa, 267. 



insignis, 262, 26^. 



Pinus lambertiana, 233. 



longifolia, 267. 



maritima, 262. 



ponderosa, 264, 267. 



sabiniana, 264. 



silvestris, 262. 



strobus, 163, 233, 262. 



thunbergii, 267. 



Pisum sativum, 275, 315, 

 Plane leaf scorch, 284. 

 Platanus occidentalis, 284. 



orientalis, 284. 



racemosa, 285. 



Plum, 85, 136, 197, 208, 268, 300. 



leaf blight, 291. 



blister, 135, 



, rust, 257. 



scab, 310. 



Polygonum chinense, 217. 

 Poplar, 91, 92, 193, 197, 208. 

 Populus nigra, 238. 



tremula, 236, 238. 



Potato, 115, 116, 157, 172, 345. 



bacterial disease, 342. 



disease, 62. 



leaf curl, 323. 



rot, 333. 



scab, 225. 



American, 299. 



sweet, 59. 



Pringlea antiscorbutica, 61. 

 Prothallia, damping-off, 56. 

 Prunus americana, 137. 



chicasa, 136. 



japonica, gummosis of, 306. 



maritima, 137. 



pensylvanica, 137. 



serotina, 137. 



virginiana, 137. 



Pseudotsuga douglassii, 160. 

 Purging fiax, 239. 



Quassia, 343. 

 Quercus nigra, 235. 



tinctoria, 235. 



Quince, 90, 276. 



Radish, 61, 79, 334, 

 Rape, 79. 

 Raspberry, 210. 



rust, 258. 



spot, 286. 



