X 



92 



that failed to detect any living boll weevils in cotton on the Graves farm un- 

 til after September 1 and the presence of an infertile female indicated that 

 boll weevil reproduction was prevented until t'.it xnsects began to move oato the 

 farm from adjacent cotton. Based on calculations of the maximum population of 

 overwintered boll weevils that remained on the farm, the overwintered population 

 can be estimated to have been as low as one boll weevil per 100 acres. 



171. ; Stokes, R. A.; Kinzer, R. E. ; and Ridgway, R. L. 1974. Biological 

 evaluations of slow release formulations of aldicarb. J. Econ. Entomol. 

 67: 292-294. 



In 2 field-cage tests, a slow release granular formulation consisting of 

 80% petroleum charcoal, 10% water-insoluble binder, and 10% aldicarb 

 (designated PC-10) applied to the soil gave an additional 7-10 days of 

 control of the boll weevil, Anthonomus grandis Boheraan, compared with the 

 standard corncob formulation applied in the same manner. A formulation 

 with 20% water-insoluble binder (designated PC-20) , and consequently a 

 slower rate of toxicant release, gave similar results in 1 test, but in a 

 2nd test was no more effective than the corncob formulation. In 2 of 3 

 field tests, counts of plant stand indicated that the PC-20 formulation 

 was less damaging to cotton seedlings tnan the corncob formulation when both 

 -were applied aa in-furrow treatments at planting. In 3 f ield«-tests, the 

 PC-20 formulation appeared more effective against the b^ll weevil than the 

 corncob formulation. Also, it was more effective against the cotton flea- 

 hopper, Pseudatomoscelis serlatus (Reuter) , in 2 of the tests. 



172. ; Stokes, R. A.; Ridgway, R. L.; and Kinzer, R. E. 1976. Slow-release 

 formulations of aldicarb. Modeling of soil persistence. U.S. Agrlc. Res. 

 Serv. [Rep.] ARS-S-103, 6. pp. 



Theoretical models developed from data on the persistence of aldicarb in soil 



