439 



859. Stokes, R. A.; Coppedge, J. R. ; Bull, D. L.; and Ridgway, R. L. 1973. 



Use of selected plastics in controlled release granular formulations of 

 aldlcarb and dimethoate. J. Agric. Food Chein. 21: 103-108. 



I Granular formulations of aldicarb prepared with cellulose acetate, polyamide, 

 polyster, polyvinyl chloride, polj'urethane, and urea-formaldehyde and granular 

 formulations of dimethoate prepared with cellulose acetate, polyvinyl chloride, 

 and petroleum charcoal released the insecticides more slowly into soil and 

 water than did the standard corn cob formulations of the two insecticides. 

 Greenhouse bioassays indicated that most plastic formulations of aldicarb 

 were more effective than the standard corn cob formulation in e: ending the 

 period of systemic insecticidal activity of aldicarb against adult boll weevils, 

 Anthonomus grandis Boheman. Greenhouse bioassays with cotton aphids, Aphis 

 gossypii Glover, and radioassays of plants grown in soil treated with select- 

 ed granular formulations indicated that certain plastic and charcoal formula- 

 tions of dimethoate extended the uptake from soil and the biological activity. 



860. ; Coppedge, J. R.; and Ridgway, R. L.'*l970. Chemical and biological 

 evaluation of the release of aldicarb from granular formulations. J. 

 Agric. Food Che.r.. 18: 195-198. 

 The relative rates of release of aldicarb (newly accepted common name for 

 2-methyl-2-(methylthio)propionaldehyde 0-(methylcarbaraoyl)oxime; Temik, 

 UC-21149) from granular formulations into water and soil were affected by 

 the type base material, the type and percentage of binder used, and the 

 mesh size. Useful correlations between release rates in a laboratory water 

 immersion test and extended biological activity were obtained. Bioassay of 

 the new grov/th of treated cotton plants with boll weevil, Anthonomus grandis 

 Boheman, showed that prolonged uptake of the toxicant in the plant occurred 

 with formulations which had slow rates of release in a laboratory water im- 

 mersion test. Also, mixtures of granular formulations with fast and slow 



