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Metalaxyl Toxicity to Citrus with or without Herbicides

Published online by Cambridge University Press:  12 June 2017

Megh Singh  and
Wondimagegnehu Mersie
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
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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.

Keywords

Bromacil, 5-bromo-6-methyl-3-(1-methylpropyl)-2,4(1H,3H)-pyrimidinedionemetalaxyl, N-(2,6-dimethylphenyl) N-(methoxyacetyl)-DL-alanine methyl estermetolachlor, 2-chloro-N-(2-ethyl-6-methylphenyl)-N-(2-methoxy-1-methylethyl)acetamidesimazine, 6-chloro-N,N′-diethyl-1,3,5-triazine-2,4-diaminemandarin, Citrus reticulata Blando, ‘Cleopatra.’BromacilmetolachlorsimazinefungicidePhytophthora parasitica
Type
Notes
Information
Weed Technology , Volume 7 , Issue 2 , June 1993 , pp. 511 - 514
Copyright
Copyright © 1993 Weed Science Society of America 

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References

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