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Efficacy and Rate of Release of EPTC and Butylate from Starch Encapsulated Formulations Under Greenhouse Conditions

Published online by Cambridge University Press:  12 June 2017

M. M. Schreiber ,
B. S. Shasha ,
M. A. Ross ,
P. L. Orwick  and
D. W. Edgecomb Jr.
M. M. Schreiber
Affiliation:
Sci. Ed. Admin., U.S. Dep. Agric. Dep. Bot. and Plant Pathol., Purdue Univ.
B. S. Shasha
Affiliation:
Sci. Ed. Admin. U.S. Dep. Agric., North. Reg. Res. Center, Peoria, IL 61604
M. A. Ross
Affiliation:
Dep. Bot. and Plant Pathol., Purdue Univ., West Lafayette, IN 47907
P. L. Orwick
Affiliation:
Dep. Bot. and Plant Pathol., Purdue Univ., West Lafayette, IN 47907
D. W. Edgecomb Jr.
Affiliation:
Dep. Bot. and Plant Pathol., Purdue Univ., West Lafayette, IN 47907
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Abstract

Four starch-encapsulated formulations of EPTC (S-ethyl dipropylthiocarbamate) and of butylate (S-ethyl diisobutylthiocarbamate) were prepared and evaluated by comparison with their respective emulsifiable concentrate formulations for their 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 formualtion process. EPTC and butylate released slower when formulated as starch-encapsulated granules than when formulated as emulsifiable concentrates under soil conditions that favored rapid release. The initial release was adequate for weed control and slow enough for desired residual activity. Repeated seeding and harvesting the treated soils and bioassays of treated soils generally produced release rate anticipated from short term dry and wet chemical tests.

Keywords

Slow releasecontrolled release
Type
Research Article
Information
Weed Science , Volume 26 , Issue 6 , November 1978 , pp. 679 - 686
Copyright
Copyright © 1978 by the Weed Science Society of America 

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References

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