/ 



429. Hudspeth, W. N.; Jenkins, J. N.; and Maxwell, F. G. 1969. Ascorbic acid 

 impractical as a character for resistance in cotton to the boll weevil. 

 J. Econ. Entomol. 62: 583-584. 

 The weijjht of adult Anthonomus grand is Boheman and the length of the develop- 

 mental period were normal over 4 generations when adult and larval diets were 

 formulated with 7.50-393.75 mg of ascorbic acid/100 g of diet. Approximately 

 500 adults were produced in each generation. VJhen both diets were prepared 

 without ascorbic acid only 10 adults were produced in the 2nd generation and 

 none thereafter. No major effects on feeding or oviposition were found which 

 could be associated with ascorbic acid content of the media. Since minute 

 quantities of ascorbic acid are sufficient for the boll weevil, we concluded 

 that it would not be practical to attempt to develop cotton lines resistant 

 to the boll weevil via low ascorbic acid content. 



223 



430. Ivy, E. E. 1972. Pencap M: an improved methyl parathion formulation. J. 



Econ. Entomol. 65: 473-474. 

 Polymeric microcapsules containing methyl parathion have shown increased activity 

 as well as longer residual action agains?- Heliothis zea (Boddie) , Anthonomus 

 ^-. -grandis Eohcmrin, Tctranychus urticae Koch, Popillia japonica %wman, and 



Porthetria dispar (L.). In addition, the composition is no more than 1/500 as 

 toxic by skin absorption, and 1/40 to 1/100 as toxic by ingestion than conven- 

 tional methyl parathion formulation. 



