Submitted to: Book Chapter
Publication Type: Book / Chapter
Publication Acceptance Date: June 1, 1999
Publication Date: N/A
Technical Abstract: Controlled release pesticide formulations have the potential to improve handling safety and reduce adverse environmental impact while maintaining efficacy. Processes and technologies to encapsulated pesticides in a matrix of cornstarch were the result or the efforts of many USDA, ARS scientists. These processes began as chemically intense, batch type process and evolved into a continuous manufacturing process that was successfully scaled-up to produce plans and cost estimates for full commercial production of a formulated pesticide. The production utilizes twin-screw extrusion technology as the center of the continuous flow production process. Large-scale field trials demonstrated the efficacy and agricultural usage of the products while at the same time providing feedback that resulted in the fine-tuning of the process. Starch- encapsulated formulations of atrazine and metolachlor herbicide provided acceptable weed control and reduced the loss of these herbicides in runoff water and through leaching. The processes and procedures for developing and producing controlled release formulations from cornstarch have been well developed and tested. Examination of environmental and weed control issues demonstrate that starch encapsulation technology has a great potential yet to be realized.