16 



BULLETIN 513^ U. S. DEPARTMENT OP AGRICULTURE. 



Table I. — Plants and insects fumigated vnth hydrocyanic-acid gas in green- 

 houses — Continued. 



Name of plant. 



Rate in 



ounces 



per 1,000 



cubic 



feet. 



.a '3 



a . 



373 



Infestation. 



Results of treatment. 



On plants. 



On insects. 



Ficus sp. 



Forgetmenot. 



FoTsytMa viridissima. 



Freesia 



Do 



Fuchsia 



Do 



Do 



Gaillardia sp. 

 Gardenia 



Do 



Do 



Do 



Genista 



Do 



Geraniums: 

 Martha Washington . 



Do 



Peppermint . 



Bedding 



Do.. 

 Rose 



Gladiolus 



Do 



Heather (Scotch) 



Do 



Do 



Do 



Heliotrope 



Do 



Hibitcus sp 



Do... 



Hyacin th (water) 



Do 



Hydrangea (French va- 

 riety). 



Do 



Ilex sp. (English) 



Do 



Impatiem sullani 



Do 



Ipomoea sp. (morning 

 glory). 



Do 



Iris (Spanish) , 



Do 



Lantana sp 



Do 



LauTus nobilis , 



Do 7i 1 



1 The difference in results noted was due 



Thread scale. 



Aphids. 



Green h o u s ( 



white fly. 

 do 



Severe burning; 

 all leaves 

 knocked. In- 

 jury largely 

 due to close 

 proximity of 

 generator to 

 plant. 



Severe burn- 

 ing of tender 

 foliage. 



No burning.. . 



— do 



.-..do 



....do 



Aphids. 

 do.. 



Green h o u s < 



white flv. 

 do....'.... 



Aphids. 



....do 



Slight burning 

 No burning.. 



do 



.....do 



.....do 



Slight burning 

 No burning . . . 

 Flowers 

 burned. 



New growth 

 burned. 



No burning. 



do 



....do 



do 



New growth 



binned. 

 No burning. . . 



....do 



do 



do 



Slight burning 



do 



No burning . 



do 



do 



do 



do 



do 



do 



.do. 

 .do. 

 .do. 

 -do. 

 .do. 

 .do. 



Orthczia. 



Soft brown 



scale. 

 do 



do 



do 



Tips burned. 

 No burning.. 



do 



do 



All stages killed. 



100 per cent killed. 



All stages except eggs 

 and late pupae killed. 

 Do. 



60 per cent killed. » 

 100 per cent killed.i 



All stages except eggs 

 and late pupae killed. 

 Do. 



100 per cent killed. 



70 per cent killed. 

 Immature stages killed. 



.do 90 per cent killed. 



to the difference in the tightness of the two houses. 



