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Response of Azalea (Rhododendron obtusum) Cultivars to Sethoxydim and Fluazifop-P

Published online by Cambridge University Press:  12 June 2017

Jeffrey F. Derr
Jeffrey F. Derr*
Affiliation:
Dep. Plant Path., Physiol. Weed Sci., Va. Polytech. Inst. State Univ., Blacksburg, VA 24061
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Abstract

Experiments were conducted to evaluate varietal susceptibility of azalea [Rhododendron obtusum (Lindl.) Planch] to fluazifop-P {(R)-2-[4-[[5-(trifluoromethyl)-2-pyridinyl] oxy] phenoxy] propanoic acid } and sethoxydim {2-[l-(ethoxyimino)butyl]-5-[2-(ethylthio)propyl]-3-hydroxy-2-cyclohexen-1-one}. Injury observed on ‘Delaware Valley White’, ‘Hinocrimson’, and ‘Poukhanense’, following broadcast applications of fluazifop-P at 1.12 kg ai/ha, ranged from 5 to 53% foliar damage. Injury symptoms observed were leaf burn, spotting, and distortion, especially in younger leaves. Sethoxydim at 2.24 kg ai/ha caused either slight or no foliar injury to the cultivars tested. Both sethoxydim and fluazifop-P caused temporary growth reduction in ‘Hershey Red’. Foliar injury or growth reduction resulting from these herbicides was temporary, with no damage evident 6 weeks after application. Although adding either crop oil concentration or a nonionic surfactant increased phytotoxicity of fluazifop-P to Hinocrimson and Poukhanense, these adjuvants were not phytotoxic to azalea cultivars when applied alone.

Keywords

Woody ornamentaladjuvantsphytotoxicity.
Type
Research
Information
Weed Technology , Volume 1 , Issue 3 , July 1987 , pp. 226 - 230
Copyright
Copyright © 1987 by the Weed Science Society of America 

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References

Literature Cited

1. Ahrens, J. F. 1983. Postemergence grass herbicides for woody ornamentals and Christmas trees (Abstr.). Proc. Northeast. Weed Sci. Soc. 37:318.Google Scholar
2. Bing, A. 1983. The effect of crop oil, sethoxydim, fluazifop-butyl, DOW 453 and CGA 82725 applied to growing nursery plants in containers and in the field for postemergence grass control. Proc. Northeast. Weed Sci. Soc. 37:319–321.Google Scholar
3. Bing, A., and Macksel, M. 1984. Postemergence applications of fluazifop-butyl and sethoxydim on azaleas. Proc. Northeast. Weed Sci. Soc. 38:251–252.Google Scholar
4. Bonanno, A. R., and Monaco, T. J. 1985. The influence of environmental conditions and adjuvants on the phytotoxicity of sethoxydim and fluazifop-butyl to selected horticultural crops. Abstr. Weed Sci. Soc. Am. 25:27–28.Google Scholar
5. Coffman, C. B., Frank, J. R., and Gentner, W. A. 1984. Sethoxydim (Poast) and oxyfluorfen (Goal) efficacy and tolerance by landscape plants. J. Environ. Hort. 2(4): 120–122.Google Scholar
6. Doty, C. H., Colby, S. R., and Dicks, J. W. 1985. PPOO5 for postemergence grass control in broadleaf crops. Abstr. Weed Sci. Soc. Am. 25.13–14.Google Scholar
7. Frank, J. R., and Beste, C. E. 1986. Postemergence control of weeds in azalea with sethoxydim and fluazifop. HortScience 21:1400–1403.CrossRefGoogle Scholar
8. Gilliam, C. H., Crockett, J. S., and Pounders, C. 1984. Bermudagrass control in woody ornamentals with postemergence applied herbicides. HortScience 19:107–109.CrossRefGoogle Scholar