INDEX. 



727 



reaction between calcium arsen- 

 ates and, 338. 

 Sodium Cyanide, in baits for Blissus 

 leucopterus, 305, 306 ; in prepara- 

 tion of liydrocyanic-acid gas, 11, 

 83, 157, 508; fumigation with, 

 against orchard pests. 27, 145, 169. 



Sodium Fluoride, against cock- 

 roaches and Lepisma, 412 ; effec- 

 tive against cockroaches, 531 ; 

 effect of, on clothes moths and 

 carpet beetles, 532, 533. 



Sodium Hydroxide, 111. 



Sodium Nitrate, treatment of soil 

 with, against insect pests, 60, 

 74, 139, 432, 435 ; watering 

 plants with, against Aphis bras- 

 sicae, 153 ; more economical 

 than sou sterilisation against 

 wireworms, 426 ; and caustic 

 solution, injurious to foliage, 100. 



Sodium Salts, addition of fungi- 

 cides containing, to nicotine- 

 paraffin emulsion, 239. 



Sodium Sulphide, in sprays for 

 orchard pests, 162, 331, 449 ; 

 increasing the value of arsenicals, 

 362 ; and calcium arsenate, 162, 

 330 ; and talc, dusting with, 

 against Aspidiotus perniciosus, 

 413. 



Sodium Sulphoricinate, in formulae 

 against Eriosoma laiiigerum, 411, 

 471 ; in formulae against vine- 

 moths, 72, 73. 



Soft Brown Scale (see Coccus 

 hesperidum). 



Soil, treatment of, against insect 

 pests, 60, 74, 139^ 432, 435; 

 varieties of, resistant to fumiga- 

 tion with hydrocyanic-acid gas, 

 83 ; influence of character of, 

 on insect pests in Rhodesia, 

 240, 337, 338 ; experiments in 

 sterilisation of, against wire- 

 worms, 426. 



solanella, Lita (see Phthorimaea 

 operculella) ; Bhopalosiphum. 



solani, Chionaspis ; Bhopcdosiphum 

 ( Macrosiphum, Siphonophora). 



solanifolii, Macrosiphum. 



solanina, Myzus. 



Solanum (Nightshade), food-plant 

 of Phthorimaea operculella in 

 California. 292 ; Aphis malvoides 

 on, in Lahore, 473. 



Solanum dulcamara (Woody Night- 

 shade), food-plant of Psylliodes 

 affinis in Britain, 509. 



Solanum melongena (see Egg-plant). 



Solanum nigrum, food-plant of 

 Pachyzancla periusalis in Porto 

 Rico, 485. 



Solanum sieglinge, food-plant of 

 Heliothis virescens in U.S.A., 214. 



(C569) 



Solanum torvum (Wild Egg-plant), 

 food-plant of Pachyzancla periu- 

 salis in Porto Rico, 485, 486. 



Solanum tuberosum (see Potato). 



Solenococcus, intercepted in avocado 

 seed in U.S.A., 206. 



Solenopsis. natural enemy of boll 

 weevils in U.S.A., 248. 



Solenopsis geminata (Brown Ant), 

 measures against, on citrus in 

 Porto Rico, 486. 



Solenopsis pylades, associated with 

 scale-insects in Br. Guiana, 386. 



Solidago, Macrosiphum rudbeckiae 

 on, in Br. Columbia, 361 ; food- 

 plant of insect pests in U.S.A., 

 110, 308. 



Solidago fuchsii, Agrotis collina 

 on, in Saxony, 479. 



Solidago rugosa, Lopidea on, in 

 U.S.A., 102. 



solieri, Chrysobothris. 



Solomon Islands, Brontispa frog- 

 gatti on coconut in, 523. 



soistitialis, Amphimallus (Bhizo- 

 trogus). 



Somaliland, Italian, a new cotton- 

 stainer from, 488. 



somei. Aphis. 



Sonchus (Sow-thistle), alternative 

 host-plant of Bhopalosiphum lac- 

 iucae in Sweden, 146 ; pests of, 

 in U.S.A., 252, 317. 



Sonchus oleraceus, Bhopalosiphum 

 lactucae on, in Japan, 548. 



Soot, as a dressing against insect 

 pests, 119, 432, 435, 442, 509; 

 watering of plants with, against 

 Aphis brassicae, 153 ; and helle- 

 bore, dusting with, against 

 Pteronus ribesii, 159. 



Sooty Mould (Capnodium, 3Ieliola), 

 associated with Aphids and 

 scale-insects, 41, 68, 283, 367, 

 401. 



sophorae, Brassolis. 



sorbi. Aphis ; Psylla (Ghermes). 



Sorbus aria, mites forming galls on, 

 in Austria, 406. 



Sorbus aucuparia (Mountain Ash), 

 Psylla sorbi on, in Britain, 430 ; 

 pests of, in Canada, 60, 381 ; 

 pests of, in Norwav and Sweden, 

 148, 149, 150, 285; food-plant 

 of Saperda Candida in U.S.A., 

 447 ; Nygmia phaeorrhoea inter- 

 cepted on, in U.S.A., 312 ; mites 

 forming galls on, 406. 



sordidus, Acanthocoris ; Cosmo- 

 polites ; Eucoptolaphus. 



sordipes, Microplitis. 



sorghicola, Contarinia (Diplosis). 



Sorghum (Cholam, Juar, Broom- 

 corn) (Andropogon sorghum), Pere- 

 grinus maidis on, in Barbados, 



1.2 



