26 



I parathion, following a change in the field from the use of chlorinatad hydro- 



I carbon to organophosphorus insecticides, was determined by topical treatment 



I of four weevil populations. Three of the populations, originally resistant to 



1 



I • endrin, continued to exhibit resistance to this insecticide after 5 years. 



i 



I However, there was a trend toward a lowering of the LD-50 values. An endrin- 



I susceptible population showed a consistent increase in the LD-50 but is still 



considered susceptible to endrin. The response to methyl parathion was essen- 

 i tially the same among the population during the 4 years and no resistance to 



this insecticide is suspected. 



45. Becton, A. J. 1972. Summary of research cbndi rted with GS-13005 (Supracide 

 R) for control of cotton pests in the Cotton Belt of the United States. 

 Folia Entomol. Mex. 23-24: 26-27. (In Spanish). 

 Data from eleven trials where GS-13005 was evaluated for Anthonoaus grandis 

 Boheman control are presented. These data indicate that GS-13005 at 1 lb 

 ai/acre was comparable to Toxaphene + DDT at 2 + 1 lbs ai/acre and Guthion 

 at 1/4 and superior to methyl parathion at 1/4. 



I 46. Bedoukian, R. H., and Wolinsky, J. 1975. A biogenetic-type synthesis 



I 



I of the cyclohexyl constituents o£. the boll weevil pheromone. J. Org. 



___. Chem. 40: 2154:2156. 



*-» 



i Treafcaent of the acid chloride of geranic acid with triethylamine and methanol 



f 



I affords methyl ys^'^sii'^te contaminated by ca. 10% of methyl geranate. Acid- 



\ 



\ catalyzed cyclization of methyl ygeranate affords, in high yield, a mixture 



I; 



-. composed primarily of methyl 3,3-dlmethylcyclohexenylacetates (12 and 13). 



I The endocyclic unsaturated isomers 12 and 13 were converted to the desired 

 I 



I conjugated, exocyclic isomers 15 and 16 by addition of hydrogen bromide 



I followed by dehydrobromination with triethylamine. Lithium aluminum hydride 



I reduction of 15 and 16 gave (Z)- and (E)-3,3-dimethyl-Al.6_^y^,^j^^^^^^^^j^^^^^ 



1— "\"ii— 



MKaan»caBB3B3aM 



