A METHOD OF FUMfGlTIlSrG SEED, ^ 



Table I. — Summary of experinunts in fumigating against insects — Continued. 



Material. 



Infested with — 



Kind ofcyanid 



and amount 



used. 



' ' ' i ■ ■ ' ' ■ 

 Timej 



e^o-' ^-hlt. 

 sure, i 



Germination test . 



Avocado: 

 7 seeds. . 



6 seeds.. 



Larvae of Conotrache- 

 lus sp. and broad- 

 nosed grain weevil, 

 all stages. 



4 with all stages of 



broad-nosed grain 



weevil; 2 uninfested. 



Scolvtid 



Sodium evanid, 

 2gnis. ■ 



...do 



do 



i 

 i 



i 



i 



1 



i 



1 



30 



1 'grain- wee^^l lar- 

 va alive. 



All stages dead 



Out of several hun- 

 dred specimens 

 1 live adult was 

 found. 



All stages dead — 



Insects alive 



.'\.ll stages dead 



do 



Not planted. 



3 seeds planted and all 

 germinated. 



Not planted. 

 Do. 



Do... 



do 



Sodium cyanid, 



4 gms. 

 Sodium cyanid, 



2 gms. 



Sodium cyanid, 

 4 gms. 



do 



SoTghnm 

 seed. 



Do 



Do 





75.5 per cent germina- 

 tion; seed badly in- 

 fested. 



71 per cent germina- 

 tion; seed badly 

 eaten. 



S,S per cent germina- 



Bruchus sp. and rice 

 weevil {Calandra 

 oryza). 

 do 



Do. . 



Rice weevil and ca- 

 deUe ( Ttnebroides 

 mauritanicu^). 



do . 



Sodium cyanid, 

 Igm., in des- 

 iccator. 



do 



do 



tion. 

 Of four grades fumi- 



Do 



do 



gated, the percentage 

 of germination was 

 as follows: 78.5; 86.5; 

 88; 83. 

 Germination of fumi- 



Do 





Potassium cy- 

 anid, 2 gms. 



do 



gated seed superior 

 to that of untreated 

 seed. 

 Seed thoroughly in- 









fested with insects 

 previous to fumigat- 

 ing and only 15 per 

 cent germinated. 



Bulbs thoroughly in- 

 fested and unfit for 

 planting. 



Not planted. 



Percentage of germina- 

 tion approximately 

 the same with both 

 fumigated and un- 

 treated seed. 

 Do 



Bulbs 



Cottonseed. 



OledJtsia si- 

 nensis in 

 .seed pods. 



Bulb mite (Rhizogly- 

 jihus hyacinthi). 



Adults of the red grain 

 beetle (Cathartua ge- 

 mellatun). 



Bruchus sp. (adultsj.. 



do 



Sodium cyanid, 

 J gm., in des- 

 iccator. 



Sodium cyanid, 

 U gms. 



Sodium cyanid, 

 2 gms. " 



1 

 1 

 § 



i 

 1 



All mites dead 



All insects dead.... 



All insects dead, 

 both in and out 

 of seed pods. 



do . 







4 gms. 

 Sodium cyanid, 

 J gm., in des- 

 iccator. 



do 



All insects dead . . . 

 <l() 



Germination of fumi- 



viilgari.s. 

 Pineapples . 



Pseudoooccus .sp 



gated seed superior 

 to that of untreated 

 seed. 

 Not planted. 



Tussock 

 moth 

 (Ilemero- 

 campalew- 

 cniftigma): 

 .VX) egg 





Sodium cyanid, 

 2 gms. 



Sodium cyanid, 

 4 gms. 



i 



Some 1 a r v ic 

 hatched several 

 days after e.xpo- 

 sure. 



No hatching 





masses. 



250 egg 

 masses. 









The results given in TaMc I indic.ale lliut llie I'liniiffation of soods 

 [jV llic introdnc.lion of hydrocyuiiic ucid into un iiir-tight chain})or, 

 from which ihct air lias b(uin j)i'ac.t icalJy ('.\haiisl(Hl, is (iir(M;t,ivo, 

 |irovi(l<'d the cxposiin' is not less fhiiii half an houi'. An (^.xposiiro 

 of one-fourth hour i.-. cncctivc wilh I he iippiirnl us (Mnph)ye(l in those 

 cxperirneiit ^ if fmir nv more. ^/liiiiis of cviuiid ;i,rc uscul. 



