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Impact of Herbicides Applied Annually for Twenty-three Years in a Deciduous Orchard

Published online by Cambridge University Press:  12 June 2017

Chester L. Foy ,
Charles R. Drake  and
Carlton L. Pirkey
Chester L. Foy
Affiliation:
Dep. Plant Pathol., Physiol. and Weed Sci., Virginia Polytech. Inst. State Univ., Blacksburg, VA 24061
Charles R. Drake
Affiliation:
Dep. Plant Pathol., Physiol. and Weed Sci., Virginia Polytech. Inst. State Univ., Blacksburg, VA 24061
Carlton L. Pirkey
Affiliation:
Dep. Plant Pathol., Physiol. and Weed Sci., Virginia Polytech. Inst. State Univ., Blacksburg, VA 24061
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Abstract

A semi- and high-density apple and peach orchard was established at Blacksburg, VA. Starting 1 yr after transplanting, tree rows were treated with paraquat, 2,4-D, or amitrole plus simazine for 4 yr. Thereafter, diuron, simazine, or terbacil was applied in conjunction with paraquat or glyphosate. During the 12th growing season, young trees planted between existing trees failed to make proper growth. Oat bioassay of soils collected from treated rows revealed that the tree row topsoil (0 to 7.5 cm) produced less oat biomass than did deeper row soils (to 30 cm) or soils of corresponding depths from adjacent non-treated tall fescue sod alleyways. Poor growth of trees may have been related to other factors (competition from older trees, drought conditions, etc.) since herbicide residues in the upper 7.5 cm would have little effect on tree roots below this depth. After 3 yr the trees developed normally. Tree rows became heavily infested with weeds 1 yr following cessation of 23 yr of consecutive herbicide treatments.

Keywords

Amitrole, 1H-1,2,4-triazol-3-amine2,4-D, (2,4-dichlorophenoxy) acetic aciddiuron, N'-(3,4-dichlorophenyl)-N,N-dimethylureaglyphosate, N-(phosphonomethyl) glycineparaquat, 1,1′-dimethyl-4,4′-bipyridinium ionsimazine, 6-chloro-N,N'-diethyl-1,3,5-triazine-2,4-diamineterbacil, 5-chloro-3-(1,1-dimethylethyl)-6-methyl-2,4(1H,3H)-pyrimidinedioneapple, Malus sylvestris Mill., oat, Avena sativa L.peach, Prunus persica; tall fescue, Festuca arundinacea ShrebAmitroleapplebioassay2,4-Ddiuronglyphosateoatparaquatpeachtall fescuesimazineterbacil
Type
Note
Information
Weed Technology , Volume 10 , Issue 3 , September 1996 , pp. 587 - 591
Copyright
Copyright © 1996 by the Weed Science Society of America 

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References

Literature Cited

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