Efficacy and rate of release of EPTC and butylate from starch encapsulated formulations under greenhouse conditions
Schreiber, M.M. | Shasha, B.S. | Ross, M.A. | Orwick, P.L. | Edgecomb, D.W. Jr
Four starch-encapsulated formulations of EPTC and butylate were prepared and compared with their respective e.c. formulations for slow-release capabilities and efficacies. Chemical and biological evaluation indicated that difference in controlled-release could be achieved by the selection of the starch xanthate and oxidant used in the formulation process. EPTC and butylate released more slowly when formulated as starch-encapsulated granules than when formulated as e.c.'s under soil conditions that favoured rapid release. The initial release was adequate for weed control and slow enough for desired residual activity. Repeated sowing and harvesting of the treated soils and bioassays of treated soils generally produced release rates that were anticipated from short term dry and wet chemical tests.
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