426 



Index 



Plantain lily variegated, blight 

 of, 284 



Plant diseases, nature of, 93 

 Plant lice, 371 



Plasmodiophora hrassicae, 122 

 Pleospora orchidearum, 305 

 Poinsettia, 313 

 collar rot, 314 



cultural considerations, 313 



diseases of, 314 

 Potassium, changes of, 14 



sulphide, 406 

 Primrose, 315 



anthracnose, 316 



blight, 316 



cultural consideration!^ 315 



diseases of, 315 



leaf blotch, 317 



leaf spot, 317 



spot decay, 315 

 Primula obconia, 316 



sieboldii, 316 



sinensis, 315, 316 

 Pseudococcus citri, 370 



longispinus, 370 

 Pseudomonas campestris, 124, 

 125 



erodii, 262, 263 

 fiuorescens, 162 

 hyacinthi, 267, 268 

 lachrymans, 138 

 maculicolunit^ 123, 134 

 marginale, 148 

 phaseoli, no, in 

 solanacearum, 185, 186 

 syringae, 275 

 teutlium, 119 



tumefaciens, 114, 115, 236, 



320 



viridili'vidum, 147 



<vitans, 147, 148 

 Pseudoperonospora cubensis, 138 

 Pteris argyria, 258 



cretica, 258 



cretica var. magnifica, 258 

 serrulata avistata, 26, 216, 254 

 tremula, 26 

 wimeseth, 26 

 Puccinia antirrhini, 202 

 chrysanthemi, 237 



Puccinia eriophori, 243 



menthae, 154 



oxalidis, 306 



phragmitis, 176 



prostii, 349 



schroeteri, 2%Z 



tulipae, 349 



violas, 353 

 Pucciniastrum hydrangeae, 273 

 Pyrenochaeta bergevini, 206 

 Pythium de Baryanum, 17, i8, 



127, 256, 257, 264 

 Pythium intermedium, 256, 257 



Radish, 30, 67, 173 



cultural considerations, 173 



damping off, 17^ 17^ 



diseases of, 173 



downy mildew, 175 



root knot, 175 



scab, 174 

 Ramularia primulae, 317 

 Rand, F. V., 137 

 Rane, F. W., 67, 84 

 Raphnus sativus, 173 

 Razi, Ali, 238 

 Reddick, D., 356 

 Red spider, 365 

 Reseda odorata, 286 

 Rest period, breaking of, 86 

 Rheo sporangium aphaniderma^ 



turn, 174 

 Rhizoctonia root rot, 20 



solani, 19, 20, 21, 119, 153, 

 200, 2n, 233, 245, 314, 315, 

 .346 



Rhizoglypkus echinops, 279 

 Rhizopus necans, 283 

 Rhopalosiphum violae, 372 

 Rhubarb, 30, 175 



anthracnose, 176 



cultural considerations, 175 



diseases of, 176 



leaf spot, 176 



powdery mildew, 176 



rust, 176 

 Roasting or pan firing, 39 

 Rogers, S. S., 131 

 Root knot, 23t 119 



