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Metalaxyl Toxicity to Citrus with or without Herbicides

Published online by Cambridge University Press:  12 June 2017

Megh Singh
Affiliation:
Univ. Fla., IFAS, Citrus Res. and Educ. Cent., 700 Exp. Stn. Rd., Lake Alfred, FL 33850
Wondimagegnehu Mersie
Affiliation:
Univ. Fla., IFAS, Citrus Res. and Educ. Cent., 700 Exp. Stn. Rd., Lake Alfred, FL 33850

Abstract

The response of potted ‘Cleopatra’ mandarin citrus seedlings to metalaxyl applied as a mixture with metolachlor, simazine, or bromacil, or as a sequential application after the herbicides was investigated under screen house conditions. The soils were drenched with herbicides at 2.5 ppmw (mg kg−1 soil dry wt basis) in tank-mixes with metalaxyl or metalaxyl was applied as a soil drench at 5, 50, and 250 ppmw 1, 2, 3, and 4 wk after herbicide application. Citrus seedling response to treatment was dependent on the presence or absence of herbicide, metalaxyl concentration, and the time following application. Fresh weights of citrus treated with 5 ppmw metalaxyl after herbicide application were no different from those treated with the mixture. Metalaxyl at 5 and 50 ppmw alone or with metolachlor did not affect citrus seedling fresh weight. However, delaying metalaxyl application at 50 ppmw by 3 or 4 wk after simazine and bromacil increased citrus seedling fresh weight as compared with the tank-mix. Separate applications of metalaxyl at 250 ppm reduced citrus seedling fresh weight less than the mixture for all the herbicides.

Type
Notes
Copyright
Copyright © 1993 Weed Science Society of America 

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References

Literature Cited

1. Davis, R. M. 1982. Control of Phytophthora root and foot rot of citrus with systemic fungicides metalaxyl and phosethyl aluminum. Plant Dis. 66:218220.CrossRefGoogle Scholar
2. Farih, J. A., Menge, J. A., Tsao, P. H., and Ohr, H. D. 1981. Metalaxyl and efosite aluminum for control of Phytophthora gummosis and root rot of citrus. Plant Dis. 65:654657.Google Scholar
3. Farih, J. A., Tsao, P. H., and Menge, J. A. 1981. In vitro effects of metalaxyl on growth, sporulation and germination of Phytophthora parasitica and P. citrophthora . Plant Dis. 65:651654.Google Scholar
4. Freund, R. F. and Littell, R. C. 1981. SAS for linear models: A guide to the ANOVA and GLM procedures. SAS Institute, Inc., Cary, NC.Google Scholar
5. Huble, A., Kunz, W., Eckhardt, W., and Sturm, E. 1983. The fungicidal activity of acyl anilines. p. 110 in Doyle, P. and Fujita, T., eds. Pesticide Chemistry Human Welfare and Environment. Pergamon Press, New York.Google Scholar
6. Johnson, B. J. and Jellum, M. D. 1969. Effect of pesticides on chemical composition of soybean seed. Agron. J. 61:379381.CrossRefGoogle Scholar
7. Menge, J. A. 1986. Use of new systemic fungicides on citrus. Citrograph 71:245252.Google Scholar
8. Nash, R. G. and Harris, W. G. 1973. Screening for phytotoxic pesticide interaction. J. Environ. Qual. 2:493497.Google Scholar
9. Pond, E., Menge, J. A., Ohr, H. D., and Pehrson, J. A. 1984. The effect of metalaxyl and efosite-Al applied through the drip irrigation system on Phytophthora parasitica in the soil and on the yield of navel oranges. Phytopathology 74(7):854. (Abstr.).Google Scholar
10. Sandler, H. A., Timmer, L. W., and Graham, J. H. 1986. Timing of application of metalaxyl and fosetyl-aluminum for control of Phytophthora foot rot. Proc. Fla. State Hortic. Soc. 99:5759.Google Scholar
11. Timmer, L. W. 1979. Preventive and systemic activity of experimental fungicides against Phytophthora parasitica on citrus. Plant Dis. Rep. 63:324327.Google Scholar
12. Webster, H. L. and Sheets, T. J. 1969. A physiological explanation of the atrazine-dexon interaction. Abstr. Weed Sci. Soc. Am. p. 139140.Google Scholar