780 



INDEX. 



Potassium Sulphide (Liver of Sul- 

 phur), 184 ; against mites, 321, 

 479 ; against Myzaphis abietina, 

 591 ; against pear midges, 595 ; 

 formula containing, 321 ; caustic 

 effect of, in sprays, 180 ; pro- 

 posed regulations dealing with 

 purity of, in Britain, 584 ; 

 proposed regulations for sale of, 

 in South Africa, 465. 

 Potato [Solarium tuberosum), 190, 

 321 ; pests of, in South Africa, 

 187, 331 ; pests of, in Assam, 

 538 ; pests of, in Australia, 42, 

 219, 260, 297, 354 ; pests of, in 

 British Isles, 152, 447, 487 ; 

 restrictions on importation of, 

 into Britain, 486 ; Phthorimaea 

 operciilella intercepted in, ,in 

 British Columbia, 583 ; pests 

 intercepted on, in California, 

 265, 266, 295 ; pests of, in Canada, 

 130, 132, 161, 199, 244, 392, 505, 

 560, 582 ; Lepidopterous pests 

 of, in Chile, 423, 425 ; Cantharis 

 erythroscelis on, in Colombia, 207 ; 

 pests of, in Denmark, 193, 363 ; 

 Phthorimaea operculella inter- 

 cepted on, in Fiji,- 481 ; pests of, 

 in France, 287, 315 ; pests of, in 

 Germany, 1, 63, 110, 387; pests 

 of, in Hawaii, 204 ; pests of, in 

 Holland, 234, 359 ; Phthorimaea 

 operculella on, in India, 272 ; 

 Epilachna on, in Dutch East 

 Indies, 507 ; Gryllotalpa gryllo- 

 talpa on, in Italy, 223 ; pests of, 

 in Kenya Colony, 395 ; pests of, 

 in Mexico, 366, 463 ; ' Pseudo- 

 coccus intercepted on, in Porto 

 Rico, 572 ; pests of, in Russia, 

 328, 552 ; pests of, in St. Vincent, 

 413 ; Phthorimaea operculella on, 

 in Sicily, 135 ; pests of, in U.S.A., 

 15, 16, 18, 19, 22, 31, 60, 105, 

 112, 168, 181, 189, 244, 245, 246, 

 247, 267, 293, 306, 335, 372, 381, 

 460, 492, 523, 524, 560, 570, 576, 

 585 ; Tylenchus penetrans in, 

 543 ; relation of insects to dis- 

 eases of, 15, 31, 234, 287, 359, 

 460 ; sprays for, 34, 358 ; planted 

 around bean fields against Aphis 

 rumicis, 588 ; review of litera- 

 ture on pests of, in 1918, 28; 

 destroyed by rooks, 54 ; (stored), 

 measures against pests of, in 

 India, 79 ; Bibio marci in, in 

 Ireland, 152 ; fumigation of, 

 against Phthorimaea operculella, 

 260. 

 Potato, Sweet (see Sweet Potato). 



Potato Aphis, Pink and Green (see 



Macrosiphum solanifolii) . 

 Potato Beetle, Colorado (see Leptino- 



tarsa decemlineata). 

 Potato Eelworm (see Heterodera 



radicicola). 

 Potato Flea-beetle (see Epiirix 



cucumeris). 

 Potato Leaf-hopper (see Empoasca 



inali). 

 Potato Tuber Moth (see Phthorimaea 



operculella). 

 Potatoes, in baits, 1, 592. 

 Potosia affinis, on maize in France, 



402. 

 Potosia niorio, on maize in France, 



402. 

 Powder Factory, effect of gases 



from, on sprayed vegetation, 28. 

 Pow^der-post Beetle (see Lyctiis 



bninneus). 

 Powell Process, timber treated with, 



against termites, 78. 

 praefectata, Xanthorhoe. 

 praelonga, Orthezia. 

 praetiosa, Bryobia. 

 praeustus. Xylonites, 

 pratense, Oscinosoma [Oscinis). 

 pratensis, Bryobia (see B. praetiosa) ; 



Lygus ; Tipiila ; Tylenchus. 

 pratti, Aplastomorpha. 

 Prays citri, on Citrus in India, 273. 

 Prays oleae (s(je P. oleellus) . 

 Prays oleellus (Olive Moth), in 

 France, 23 ; in Morocco, 57 ; in 

 Spain, 278, 368; measures against, 

 278. 

 Prenolepis, intercepted on coconuts 

 in California, 44, 295, 514 ; inter- 

 cepted on yams in Hawaii, 172. 

 Prenolepis longicornis, in green- 

 houses in Indiana, 352. 

 Prestwichia aquatica, parasite of 



Dytiscus in Russia, 555. 

 Prestwichia solitaria, parasite of 



dragonfly eggs in Russia, 555. 

 pretiosuvn, Trichogramma (see T. 



minutum). 

 Prickly Pear, cochineal insects on, 

 in U.S.A., 219; biological 

 control of, in Australia, 565 ; (see 

 Opuntia). 

 Principe, Termitaphis subafra asso- 

 ciated with Rhinotermes putorius 

 in, 176. 

 Prionoxystus macmurtrei, on oak in 



Canada, 161. 

 Pristaulacus chlapowskii, parasite of 



Clytiis pilosiis in France, 23. 

 Pristaulacus nigripes var. duporti, 

 n., parasite of Xylotrechus quad- 

 ripes in Tonkin, 510. 



