18 
BULLETIN 513, U. S. DEPARTMENT OF AGRICULTURE. 
TasLeE I.—Plants and insects fumigated with hydrocyanic-acid gas in green- 
houses—Continued. 
Rate in 
ounces 
per 1,000 - |ro 
cubic g 5 
feet Sales 
te] - . 
Name of plant. = S Infestation. 
S |85/2| 8 
Bo laa| ele 
Bail 4s/o}] 2 
oa /Sh] a] 3 
5 SOON are |S 
3) a | 
Primula chinensis eS See | eae >i 58 eae eee ees soe 
g Se Ree ee eee So ae A; [506i Gemanteseee ese 
fa eat e PRED NRE = aed 5 3 5):,66)\ | eae sak 
Brine malacoides......- ea eee 6 | OD eee ere ae Sek 
Primula obconica.....-..-- e leee ae. 1 | 58} Greenhouse 
white fly. 
WO Fs cto. Sc os sese secta5s Bye eathe Do WDoy oak ee ae 
Eeauye GUEJAUG =e 2 H2iso Nae eral ee etal Pee ee eo aeteee 
Mish ae. aisle sister heiciare. sie a as 13 | 4 |-.---| Longscale 
read ad eiaeor He FS iy SSR ae 5 3° 1" 66) Spee a) Aon aa 
Rhyncospermum sp..-----|------ Mest Pia | DUE eae ee he Wied Be 
PosemIAhy 2: feces $22.55: 2 a eee 1a his) es ae tae 
ID YOR Ae an aero oe Feces TERS) 7 | see ae 
IR OSG see ee ote. Cee epee ae HOS Regie i ta ee ce 
1D Oe ee Soe ay beeroeiae 1 | 62 | Rose leafhop- 
per. 
One eee atte isc eta leanaee TOES (a (Cj eal Ren UR ap 
Save; Sscarlet-_--:-.2---4-- paliocecee 1s eet sk Se, ae 
ID OF ee ew nisieein ase oy Basoae TD G10) | ee ee Se ee. 
IDO ase wes cere Sulecceyee = Die, | OOU erases eters nye 
Sunes SPieeec-siaaaee ileeeaise 5 Rr (eal Bae eae Sor ae 
SAE on OS eek eee (ahis, k OO | eee nee yc 
Scilla Hive Se pega Beet EN eee De |ROO* | seee Saea ee et 
DIMM AXE Saee kansas deals cet 5 a5 2, || saeco alae 
ED) OR es SNe Ree er oe Eee Chea fe Peel Reese elke a EN 
SNapararonaae.sssske- ee: FS eeectee THe ACLUD Pe cceesccaioe aren 
DOR Ak Seas loi seats cate Sees Ts Ue ees a eccs See 3 
Spiraca cantoniensis.......|....-- Se 2/223] Aphid Saas aes 
SUC LOLOLUL ane ene eee A ee Sol eee doses ek 
Spiraea thunbergii.........\...... USS [hg cen | ees |e GOs sees 
Spiraea vanhouttei...-.-..|...... 1 2%) |e. o aes do. ere. 
SHEGKUTAS OS Se oatoposasoece TS pate i 1 | 60 | eas aT IS 
Stephanandra fleruosa.....|...... 1 ek e- 2 3) JAtphidsy es ere 
Stenhanotis floribunda.....|...... Oral as GO: |e eee eee 
DLEUUD SD See eee ries cee es Beet Se 6 Bb HCO ae aetna kB 
LOCKS OR. ere ae ssetctioe s 2 oe Pe be 62:| eee eee ee 
Sweetipeass 2.2 secscone ey eee 1s G20 | Aphids eee 
Thunbergia erecta....-.... lh he ae Niels Sell GS st - pever S  aee o ae 
DOG eee ccieneees Sp ISeetese Pe ee coo) Pe Coe aeeee 
(001 ee BR eee a P| gee 3: PTB S || cee ein 
Merbenate.: So0.caseee pe eens Lt :64.|. eee eee ee 
WG eect ce nee! | Re EWES Paya PAGO) |e EGS Le 
Verbena (lemon)......... Paleo Ax [MGA eee ee eae 
Vinca major variegata Bere a eal 1 WO ein SO eee 
19 oF See eee ee a ae 1) ))756 i Ree 5. Poc oF 
TD Piao a he i Ee a (aes i sa 
WINEW TOSSED... s 2 bac 2 | eas HO) AGL) SE i ee ee 
DORs ent oan. See SS [Byatt Sel LHR WON ae co Sas Seer 
Wandering Jew.........- Albat s See 1 iy (ACS eal pee Se 
MCCBen aoa eeceee ss als eein|- Sock GY A SY RSE ISAS Son oceeceeces 
Results of treatment. 
On plants. 
burned. 
Severe burning. 
Tender tips 
burned. 
Tips td blos- 
soms burned. 
No burning... 
No ee 
On insects. 
All stages except eggs 
and late pup killed. 
Immaturestages killed. 
100 per cent killed. 
Do. 
Do. 
Do. 
Do. 
Do. f 
Do. 
PLANTS AND INSECTS FUMIGATED IN FUMIGATION BOX. 
To determine the susceptibility of the plants listed in Table II, 
these plants were fumigated in an air-tight box under favorable con- 
ditions. 
Not only were they fumigated in an inclosure much tighter 
than a greenhouse, but they also received dosages much in excess of 
those commonly used in greenhouse work. 
