INDEX. 



779 



in U.S.A.. 338, 396, 434, 437, 482. 



483, 574. 585 ; (see Populiis 



spp.). 

 Poplar, Black ItiUian (see Populus 



monilifera) . 

 Poplar, Carolina (see Populus alba). 

 Poplar Aphis (see Eriosoma pas- 



serinii). 

 Poplar Gall Aphis (see Pemphigus 



populitransversiis) . 

 Poplar Leaf-tier (see Melalopha 



iiiclusa). 

 Poplar Longicorn (see Saperda). 

 Poppy. Aphis runiicis on, in Britain, 



404 ; pests of, in Formosa, 6 ; 



pests of, in Germany, 277 ; (see 



Papaver somn iferum) . 

 populeus, Pterocomma. 

 popiili, Apatela ; Melasoina {Chry- 



sotnela, Lina) ; Poecilocampa. 

 populicaulis, Pemphigus, 

 popidityansversus. Pemphigus. 

 Populus alba (Carolina Poplar), 



pests of, in Germany, 39. 109 ; 



attempts to rear Empoasca niali 



on, in U.S.A., 246. 

 Populus balsa)nea, Schizoneura pas- 



serinii on, in Russia, 346. 

 Populus candicans, new spinning 



mite on, in Germany, 3. 

 Populus monilifera (Black Italian 



Poplar), Saperda car char ias on, 



in Britain, 171. 

 Populus tremula, pests of, in Britain, 



171 ; pests of, in Bulgaria, 497 ; 



(see Aspen). 

 Porina spp., parasitised by Degi- 



thina buchanani in New Zealand, 



179. 

 Poropjiyllum gracilis, new Coccid on, 



in Lower California, 229. 

 porosa, Gerstaeckeria. 

 Porosagrotis orthogonia (Pale 



Western Cutworm), bionomics of, 



in Canada, 13, 488, 541 ; in 



Montana, 21, 34, 584, 585 ; 



measures against. 541. 

 Porpe bjerkandrella, on artichoke in 



Maviritius, 559. 

 Porricondyla gossypii (Red Maggot), 



on cotton m Barbados, 322, 456. 

 portentosus, Brachytvypes. 

 Porthesia montis, on tea in Formosa, 



77. 

 Porthesia similis (see Arctornis chry- 



sorrhoea). 

 Porthetria dispar (Gipsy Moth), 560 ; 



establishment of Tachinid para- 

 sites of, in North America, 62 : 



in Bulgaria, 496. 497 ; mter- 



cepted in British Columbia, 13 ; 



in France, 22, 361, 500 ; on shade- 



trees in Holland, 96 ; on pear in 

 Italy, 223 ; absence of, in Quebec 

 in 1916, 160 ; measures against, 

 in U.S.A., 50, 113, 235, 292, 351, 

 372, 461, 570; in cranberry 

 bogs, 50 ; natural enemies of, 

 62, 292, 500 ; polyhedral wilt 

 disease of, 542 ; immunity e.xperi- 

 ments with bacilli and, 22 ; band- 

 ing effective against, 309 ; Stilp- 

 notia salicis closely related to, 

 574. 



Porto Rico, banana pests in, 574 ; 

 citrus pests in, 332, 572, 597 ; 

 coconut pests in, 332. 400, 573 ; 

 spread of Platyedra gossypiella 

 into, 560 ; miscellaneous pests 

 in, 332, 334, 400, 572 ; sugar-cane 

 pests in, 222, 332. 399, 573 ; plant 

 quarantine work against insect 

 pests in, 572 ; Lepidosaphes 

 beckii intercepted in California 

 from, 266, 514 ; quarantine 

 against spread of cotton pests 

 into U.S.A. from, 313, 399. 



Portugal, Fahringeria synergorum 

 parasitic on Synergus gallaepomi- 

 formis in, 439. 



postexcisa, Zeuzera. 



posticus, Notolophus {Orgyia) ; Phy- 

 tonomus (see Hypera variabilis). 



postvittana, Tortrix [Cacoecia). 



Potash, suggested experiments with, 

 against Xyleborus fornicatus, 217 ; 

 (see Caustic Potash). 



Potash Soap, proposed regulations 

 dealing with purity of, in Britain, 

 584 ; in preparation of cresylic 

 acid ernulsion, 528. 



Potassium, fertilisers containing, 

 against vine moths, 520. 



Potassium Arsenate, in formula for 

 spray against Dacus oleae, 586. 



Potassium Bitartrate, percentage of, 

 in argol, 558. 



Potassium Cyanide, effect of ex- 

 posure to light and air on, 89 ; 

 in preparation of hydrocyanic- 

 acid gas, 28, 584 ; in preparation 

 for fumigating vines against 

 Phylloxera, 388. 



Potassium Salts, 419 ; effect of, on 

 wing development in Apliids, 

 533 ; effect of, on Helopeltis, 415 ; 

 repellent to Pcgomvia chilensis, 

 422. 



Potassium Sulphate, as a soil- 

 dressing against Heterodera radi- 

 cicola, 260. 



Potassium Sulpho-carbonate, in 

 formula for disinfecting vine sUps 

 against Phylloxera, 57. 



