FUMIGATION AGAINST GRAIN WEEVILS 7 



Table 1. — Results of fumigation tests on weevils in glass flasks at room temperature 

 (21° to 32° C.)— Continued 





Tem- 

 pera- 

 ture 



Fumigant 



Concentration 

 of fumigant 



Weevils killed after exposure 

 for 24 hours 



Test No. 



Molar 

 per- 

 cent- 

 age 



Pounds 

 per 

 1,000 



cu. ft. 



S. 

 oryza 



s. 



gran- 

 arius 



Tribo- 

 lium 



Plodia 



Esters— Con. 

 333 



°C. 



24.0 

 24.0 

 23.0 

 25.0 

 25.0 

 25.0 

 25.0 

 25.0 

 23.0 

 23.0 

 23.0 

 23.0 

 25.0 

 26.0 

 26.0 

 25.0 

 25.5 

 25.5 

 24.0 

 25.0 

 26.5 

 26.5 

 26.0 

 26.0 

 27.0 

 27.5 

 28.0 

 27.0 

 27.5 

 27.5 

 27.5 

 27.5 

 32.0 

 25.5 

 26.0 

 27.0 

 30.0 

 26.0 

 26.0 

 30.0 

 31.0 

 30.0 

 30.0 

 23.0 

 23.5 



25.0 

 25.0 

 26.5 

 21.5 

 22.5 

 23.0 

 27.0 

 27.0 

 26.0 

 26.0 

 26.0 

 23.0 

 24.0 

 26.0 

 25.0 

 25.0 



25. 

 25.0 

 24.5 



25. 



26. 

 24.0 

 24.0 

 23.0 

 23. 

 23.0 

 25. 

 25. 

 25. 

 25. 



Ethyl formate 



6.41 



4.89 



3.71 



1.80 



.60 



1.30 



1.10 



.90 



1.10 



.80 



.40 



.60 



.50 



15.50 



8.20 



3.90 



2.00 



1.00 



1.20 



.90 



1.10 



.90 



.80 



.50 



.20 



.32 



.08 



.90 



.68 



.40 



.30 



3.50 



2.50 



3.70 



1.90 



1.00 



.76 



1.68 



1.56 



1.50 



.90 



.54 



.24 



.77 



.66 



4.86 

 4.34 

 2.27 

 1.72 

 1.70 

 1.64 

 4.40 

 1.10 

 2.34 

 2.22 

 4.87 

 3.89 

 1.13 



.62 

 1.21 



.70 



1.40 

 .30 

 1.95 

 1.93 

 1.19 

 .73 

 .59 

 .42 

 .41 

 .25 

 .20 

 .10 

 .09 

 .09 



13.23 



10.09 



7.66 



3.72 



1.24 



2.68 



2.27 



1.86 



2.27 



1.65 



.83 



1.24 



1.03 



38.05 



20.13 



9.57 



4.91 



2.45 



2.95 



2.21 



2.70 



2.21 



1.96 



1.23 



.47 



.76 



.19 



2.13 



1.61 



.95 



.71 



9.96 



7.11 



10.53 



5.41 



2.85 



2.46 



5.44 



5.05 



5.44 



3.26 



1.96 



.87 



2.79 



2.39 



16.00 

 14.29 

 7.47 

 5.66 

 5.60 

 5.40 

 14.49 

 3.62 

 5.25 

 4.98 

 15.60 

 12.46 

 3.62 

 1.99 

 3.88 

 2.24 



3.14 



.67 



5.03 



4.98 



3.07 



1.88 



1.52 



1.08 



1.06 



.64 



.52 



.20 



.23 



.23 



P.ct. 



100 



100 



100 



100 



100 



100 



100 



100 



100 



100 







100 







100 



100 



100 



100 



50 



100 



100 



100 



100 



100 



100 



16 



88 



24 



100 



100 



95 



50 



100 



100 



95 



90 







70 

 

 

 100 

 100 

 20 

 

 

 



100 

 100 



50 







100 



50 

 100 

 100 

 100 

 100 

 100 

 100 

 100 



50 



100 









 

 100 

 100 

 100 

 100 

 100 

 100 

 100 

 100 

 100 

 100 

 100 

 100 



P.ct. 

 100 

 100 

 100 

 100 

 100 







90 



55 



100 



100 



90 



50 



100 



100 



90 



50 







20 











100 



100 



50 















100 

 100 



20 







100 



20 



100 

 100 

 100 

 100 

 100 

 50 

 100 

 



100 

 100 

 100 

 100 

 100 

 100 

 100 

 100 

 100 

 100 



P.ct. 



100 



100 



100 



100 



100 



100 



80 



100 



100 



100 















100 



100 



100 



100 







100 



100 



100 



100 



80 







100 



100 



15 



100 



100 



100 



100 



100 



100 



100 



100 







95 











100 



100 



75 















100 

 100 

 100 



80 

 100 

 100 

 100 

 

 100 

 100 

 100 

 100 

 100 



90 



100 









 

 100 

 100 

 100 

 100 

 100 

 100 

 100 

 100 

 100 

 100 

 60 

 



P.ct. 



357 



do.... 





359 



...do 





389 



.do 





391. 



do 





406 



....do 





407... 



. .do 





408 ! 



do 



.do 





411A 





412A.422 



423.. 



do 



do 





424 



. .do 





426,428 



.do... 





484. 







487 



.do 





490 



.do... - 





492. 



Ido— "I"""~— ~~~ — 





494 





514 



do. 





515 



.. .do 





532 



.do... 





533 



do 





542 



do 





543 



do 





166 



Methyl cyano formate 



...do 



100 



167 



100 



169 



.do 



95 



175 



do 



100 



176 



.do... 



100 



177 



do 



100 



178 



do— 



100 



38 





100 



73 



do 



100 



155 



do 



100 



158 



.do 



100 



161 



do 







44 





100 



282 







283 



do ... . 





45 





100 



75 



do... 



100 



101 



..do 



85 



103 .. 



.do 







294 







296 



do 





Ethers: 



292 





293 



do 





322 



do 





344 



do. . 





348 



.do 





351 



do— 





521 



do 





523 



do 





274 



Chlorometby 1 ether 



do 





275 





218 



s-Dichloromethyl ether 



.do... 





221 





233 



do.... 





244 „ 



do.... 





267 



do. . 





269 



do -.- 





Chi.orohydp.ins: 

 517 



Ethylene chlorohydrin 



.do 





519 





288 







290 



do 





320 



do 





329.... 



do 



do 



do 



do 



do 



do 



. .do.... 





334 





358 





360 













388.. 





390... 





397.. 



....do.... 





398 



do 





