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Comparative Efficacy of Two Formulations of Alachlor and Metolachlor

Published online by Cambridge University Press:  12 June 2017

J. Peyton Doub
Affiliation:
Eastern Shore Agric. Exp. Stn., Painter, VA 23420
Henry P. Wilson
Affiliation:
Eastern Shore Agric. Exp. Stn., Painter, VA 23420
Kriton K. Hatzios
Affiliation:
Dep. Plant Path., Physiol., and Weed Sci., Virginia Polytech. Inst, and State Univ., Blacksburg, VA 24061

Abstract

The efficacies of microencapsulated (ME) and emulsifiable concentrate (EC) formulations of alachlor [2-chloro-N-(2,6-diethylphenyl)-N-(methoxymethyl)acetamide] and metolachlor [2-chloro-N-(2-ethyl-6-methylphenyl)-N-(2-methoxy-1-methylethyl)acetamide] were compared in petri dish and soil bioassays. At equimolar concentrations, EC-alachlor inhibited shoot growth of barnyardgrass [Echinochloa crus-galli (L.) Beauv. # ECHCG], large crabgrass [Digitaria sanguinalis (L.) Scop. # DIGSA], and fall panicum (Panicum dichotomiflorum Michx. # PANDI) more than ME-alachlor. ME- and EC-metolachlor caused similar effects on the three grass weeds tested. ME- and EC-alachlor in combination caused effects on barnyardgrass shoot growth intermediate to results with either formulation alone. Air-drying and remoistening of alachlor-treated filter paper or soil before sowing barnyardgrass or fall panicum caused greater shoot length and fresh weight reduction than ME-alachlor that was not dried.

Type
Weed Control and Herbicide Technology
Copyright
Copyright © 1988 by the Weed Science Society of America 

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References

Literature Cited

1. Cameron, E. A., Schwalbe, C. P., Beroza, M., and Knipling, E. F. 1974. Disruption of gypsy moth mating with microencapsulated disparlure. Science 183:972973.Google Scholar
2. Dahl, G. H. and Lowell, J. R. 1984. Microencapsulated pesticides and their effects on non-target insects. Pages 141150 in Scher, H. B., ed. Advances in Pesticide Formulation Technology. Am. Chem. Soc. Symp. Ser. Vol. 254. Washington, DC.Google Scholar
3. Deasy, P. B. 1984. Microencapsulation and Related Drug Processes. Marcel-Dekker, New York. 361 pp.Google Scholar
4. Doub, J. P. and Wilson, H. P. 1987. Alachlor and metolachlor formulation comparisons. Proc. Northeast. Weed Sci. Soc. 41: 69.Google Scholar
5. Doub, J. P., Wilson, H. P., and Hines, T. E. 1987. Chloroacetamide comparisons in corn and soybeans. Proc. Northeast. Weed Sci. Soc. 41:36.Google Scholar
6. Gorski, S. F., Wertz, M. K., Reiners, S., and DiCenzo, G. L. 1985. Discharge rate of metolachlor from slow release tablets. Proc. Northeast. Weed Sci. Soc. 40:203.Google Scholar
7. Ivy, E. E. 1972. Penncap M: An improved methyl parathion formulation, J. Econ. Entomol. 65:473474.Google Scholar
8. Koestler, R. C. 1980. Microencapsulation by interfacial polymerization techniques—agricultural applications. In Kydonieus, A. F., ed. Controlled Release Technologies: Methods, Theories, and Applications. CRC Press, Inc., Boca Raton, FL. 273 pp.Google Scholar
9. Roeth, F. W., Burnside, O. C., and Wicks, G. A. 1983. Protection of grain sorghum (Sorghum bicolor) from chloroacetanilide injury. Weed Sci. 31:373379.Google Scholar
10. Schreiber, M. M., Sasha, B. S., Ross, M. A., Orwick, P. L., and Edgecomb, D. W. Jr. 1978. Efficacy and release rate of EPTC and butylate from starch encapsulated formulations under greenhouse conditions. Weed Sci, 26:679686.Google Scholar
11. Sliwka, W. 1975. Microencapsulation. Angew. Chem Int. Ed. 14:539549.Google Scholar
12. Smith, A. E. and Verna, B. P. 1977. Weed control in nursery stock by controlled release of alachlor. Weed Sci. 25:175178.Google Scholar
13. Spotanski, R. F., and Burnside, O. C. 1973. Reducing herbicide injury to sorghum with crop protectants. Weed Sci. 12:531536.Google Scholar
14. Wax, L. M., Stoller, E. W., Slife, F. W., and Andersen, R. N. 1972. Yellow nutsedge control in soybeans. Weed Sci. 20:194200.Google Scholar
15. White, M. D. and Schreiber, M. M. 1984. Herbicidal activity of starch encapsulated trifluralin. Weed Sci. 32:387394.Google Scholar
16. Wyse, D. L. and Strand, O. E. 1979. American germander control in corn. Weed Sci. 27:615618.CrossRefGoogle Scholar