8 



CIRCULAR 926, U. S. DEPARTMENT OF AGRICULTURE 



Table 2. — Tolerance of vegetables to insecticides applied annually 

 to the soil prior to planting, 19^9-51 — Continued 



Crop and insecticide 



Total plants 



Yield 





1949 



1 

 1950 1951 



1949 



1950 



1951 



Cauliflower 



(180 feet of row) : 

 Untreated- 



Number 



84 

 84 

 84 

 84 

 84 



Number 



45 

 54 

 56 

 59 

 62 



191 

 196 

 217 

 225 

 196 



94 

 93 

 94 

 94 

 94 



715 



880 

 926 

 856 

 868 



Number 



84 

 82 

 84 

 84 

 83 



412 

 374 

 418 

 400 

 390 



125 

 124 

 125 

 121 

 125 



975 

 1,056 

 986 

 870 

 833 



Pounds 



81 

 102 

 108 

 102 

 110 



150 

 164 

 166 

 150 

 160 



Pounds 



81 

 114 



86 

 102 

 116 



127 

 143 

 145 



141 

 143 



296 



294 

 341 

 258 

 356 



201 

 248 

 246 

 195 



Pounds 

 115 



Aldrin 



121 



Chlordane 



117 



Toxaphene 



105 



Ethylene dibromide. __ 

 Lettuce (186 feet of row in 

 1950 and 372 feet in 1951) : 

 Untreated 



107 

 265 



Aldrin 





256 



Chlordane 





273 



Toxaphene 





247 



Ethvlene dibromide 





273 



Celery (180 feet of row): 

 Untreated 



90 

 90 

 90 

 90 

 90 



190 



Aldrin 



Chlordane 



161 

 164 



Toxaphene 



Ethylene dibromide 



Carrots (186 feet of row): 

 L'ntreated 



142 

 177 



177 



Aldrin 





205 



Chlordane 





182 



Toxaphene 





151 



Ethylene dibromide 





! 



167 



Error 







42 

 301 





Onions (372 feet of row) : 

 Untreated 



442 

 459 

 450 

 397 

 431 



495 

 546 

 569 

 565 

 523 



534 

 527 

 524 

 523 



459 



42 



237 

 181 

 216 

 200 

 251 



in 



172 



Aldrin 



118 395 



113 i 413 



87 386 



180 



Chlordane 



174 



Toxaphene 



151 



Ethylene dibromide___ 

 Error 



97 



371 

 49 



37 



34 



129 

 36 



Table beets 



(186 feet of row) : 

 Untreated 





224 

 227 

 206 

 227 

 244 



137 



Aldrin 





109 



Chlordane 





45 



119 



Toxaphene 







34 

 55 



99 



Ethylene dibromide 





134 



Sweetpotatoes 

 (186 feet of row) : 

 Untreated. _ . 





178 



Aldrin 













169 



Chlordane 













164 



Toxaphene. 













173 



Ethylene dibromide 













149 



Spinach (186 feet of row): 

 Lntreated 













102 



Aldrin _ _ 













94 



Chlordane _ _ 













91 



Toxaphene. . 













85 



Ethylene dibromide . 











105 

















