6 BULLETIN 893, U. S. DEPARTMENT OF AGRICULTURE. 
TABLE 3.— Relative insecticidal action of arsine and hydrocyanic acid. 
Arsine (100 per cent lethal). ee ee (100 per cent 
Insects. Con- | Time | Tem- | Rela- | Con- | Time }|'Tem- | Rela- 
centra-| ofex- | pera- |tive hu-| centra-| ofex- | pera- | tive hu- 
tion. |posure.| ture. |midity.| tion. |posure.| ture. |midity. 
Ants (Lasius niger L., var.americanus| P. ct. | Min. Or P. ct.| Min. 2! 
INGA) nee doosonasese egecehecscsse 2.0 60 20 40 10.2 30 25 40 
Aphids (Myzus persicae Sulz.)....-.-- 1.0 60 25 40 2 60 24 40 
Tso oes) (CCUG UGE UMTS Wee oo Sella so oahaclloscesosc|eacscocellescosonc 2.0 30 20 40 
Beetles, Colorado potato ( Leptinotarsa 5 
CECEMUUN COED SAW) renee ea es | eee | Bee | eee .5 15 -30 40 
Beetles, Flat grain (Laemophlaeus mi- 
TUUCUSEO Vie) et cere  ye oeae ay eo 5 60 24 40 1.0 | 60 26 40 
Beetles, Potato flea ( Epitrix cucume- 
TESSELATLIS) eee ee a ee ee ee eae 1.0 60 20 40 5 7 27 40 
Beetles, Sawtooth grain (Silvanus 
SALTUILGNILCTESTS pli) eee ae ee Se = 5 60 25 40 1.0 30 28 40 
Borers, Grain (Rhizopertha dominica 
aD) Bcaass seek ee Sree eee Se a) 15 25 40 1.0 30 30 40 
UGS 22558 at 3 x i 2 een eaten a Be Pek 5) 60 21 40 3.1 Zi 20 40 
BVA Vce eee eee nt eee eee ne e@ 30 25 40 aul 30 25 40 
Fly, White (Aleyrodes vaporariorum 
IVVICS EWE) iin a nr es ecg Cor ee ee 5H) 30 20 40 3.1 7 30 40 
Mite, Phyllostachys bamboo ( Tarson- | 
CTS SDS) eS eee se tke se eee Cree 2.0 60 29 40 22 60 24 40 
Roaches (Blattella germanica L.)....-. 1.0 60 25 40 2 15 25 40 
Roach (Blattella. germanica L.) egg 
DOGS se eerie ic eee aes ee eee 3.0 60} = 25 AQMe so. 8 8.2) S06 ees Been ee eee 
Spiders, Red ( Tetranychus bimacu- 
lotuspEtanvey) esses eee 53.0 120 29 40 2 30 23 | 40 
Weevils, Flour (Tribolium ferrugi- | 
NMEUTU SE Ds) eee eee a ep ene 1.0 60 22 40 1.0 30 34 40 
Weevils, Rice ( Calandra oryzae L.).... 5 60 29 40 4.0 120 28 | 40 
1 Lasius niger L., var. americanus Emery and Tetramorium caespitum Fab. 
2 Mae domestica L.; Stomoxys calcitrans L.; Chrysomyia macellaria Fab.; Lucilia sericata Meig.; Phormia 
regina Meig. 
3 Not minimum lethal treatment. 4 Muscina stabulans Fall. > 99 per cent killed. 
In most cases, longer exposure and higher concentrations were 
necessary in using arsine than in using hydrocyanic acid, two notable 
exceptions being grain borers and rice weevils. Arsine has many 
disadvantages as a fumigant, and can not be recommended for this 
purpose. 
TABLE 4.— Effect of arsine on seed germination. 
| Germination. 
12 per cent! 3 per cent 
concen- | concen- 
x tration tration 
Kind of seed. ore (temp., | (temp., 
5 22 Cs 222.6: 
relative | relative 
humid- | humid- 
ity, 40). | ity, 40). 
Per cent. | Per cent. | Per cent. 
Alfalfa’ Dakota siscse eis ie eee RSs OPE RN. PRP hee ae ee eee 79.5 81.0 76.0 
Barley ss WAMmter sects sate ea ae ae ee aes ea a ere ree tere 82.5 80.5 85.5 
Carrot, Oxheart sete. Oe eis Pee bree REPU ER SER Ly Oh erat wee ee 89.5 76.5 77.5 
Com Miner ssyellow:d ent sto ee 2 aay oe e cee ae ae See nee ee ee 88.5 91.5 88.0 
AE TO] NOD, SKA ISO T tesa oes See arate eee ace i ar a ee 91.5 82.5 84.0 
i EH Ep. OW eye 01 0 A eta gs engin ea ee gE A ee Se ee ee ee ee ooue 88.5 88.5 86.5 
‘DethucesBlack-seededitenmis| baleen ss es ee ee ee eee 76.0 82.0 78.5 
Muskmelon, Burnellis'cem Ossi arn cee ee: Ce eee eee gee eee 79.0 76.0 78.0 
ONTONAPATTS Ea TAI TO eee ee ee ee eee ee 24.5 23.5 31.0 
geo TG HES) aa Kc) (0) (: eee as Rech am ano eka ula ee BONS te Gee Bocas 90.5 97.0 96.5 
Rapes Wiamtbers yoo a SE EG Pe alee ne ee ee eee ee 48.5 50.5 40.5 
Rice; Ma taribume: soo Gee oes oe ee I ala tN ae ee 44.0 54.0 44.0 
Soy bean, Mammoth: yellows 3) 183 eae oe Cee eee ee eee 18.0 24.5 4.5 
ADM OGD yess ok Sys Ae ee AR ee SR “aly ar Sey oe ER ae 74.5 W200 83.5 
Wiheat Crimean: 2) ba AOE Re ESE Pee crite Rime ne gerd peg 85.5 88.0 87.5 
In some instances germination seems to have been stimulated, 
but for the most part the gas had no appreciable effect on the seeds. 
