/ 





112 



208. ; Harding, J. A.; and Wolfenbarger, D. A. 1975. Activity of a 

 synthetic pyrethroid against cotton insects. J. Econ. Entomol. 

 68: 373-374. 



Laboratory tests with a synthetic pyrethroid, NIA-33297 (m-phenoxybenzyl 

 cis, trans- (±)-3-(2,2-dichlorovinyl)-2, 2-dimethylcyclopropanecarbosylate) 

 indicated it was more toxic than methyl parathion against the tobacco 

 budworm, Heliothis virescens (F.), the bollworm, H. zea (Boddie), and the 

 boll weevil, Anthonomus grand is Boheman. In field tests, NIA-33297 gave 

 control of Heliothis spp. equal to emthomyl and monocrotophos. 



209. ; Wolfenbarger, D. A.; and Harding, J. H. 1977. Activity of several 

 synthetic pyrethroids against the boll weevil and Heliothis spp. 

 Southwest. Entomol. 2: 164-169. 



LDcq's of the cis- and trans- isomers of (R,£)- or (S-)-[cyano(3-phenoxyphenyl) 

 methyl] or (3-phenoxyphenyl)methyl-(2,2-dimethylethenyl) of dichloro or 

 dibromo-2, 2-dimethylcyclopropanecarboxylate were determined by topical 

 application of the materials alone or in various mixtures to laboratory and 

 field-collected strains of the tobacco budworm, Heliothis virescens (F.), and 

 to laboratory strains of the boll weevil, Anthonomus grandis Boheman, and 

 the bollworm, H. zea (Boddie). The laboratory strain of the tobacco budworm 

 was more susceptible to the isomers and to the mixtures of the isomers than 

 the field-collected strain. FMC-45498-(NRDC 161, RU 22974) = (^)-[cyano 

 (3-phenoxyphenyl) methyl] cis- (+)-3-(2,2-dibromeothenyl)-2,2-dimethylcyclo- 

 propanecarboxylate cis- (+)-permethrin- (NRDC 148, FMC-35171) = (3-phenoxyphenyl) 

 methyl cis- (±)-3-(2,2-dichloroethenyl)-2,2-dimethylcyclopropanecarboxylate 

 were the most active of 10 pyrethroids tested against the field strain of 

 the tobacco budworm; FMC-45498 was the most active against the bollworm. 

 Permethrin-(NRDC 143, FMC-33297, PP-557) - (3-phenoxyphenyl)methyl cis , trans- 

 (±)-3-(2,2-dichloroethenyl)~2,2-dimethylcyclopropanecarboxylate, received in 



