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Effect of Aerially-Applied Herbicides on Texas and Puerto Rico Forests

Published online by Cambridge University Press:  12 June 2017

Clyde C. Dowler ,
Fred H. Tschirley ,
R. W. Bovey  and
H. L. Morton
Clyde C. Dowler
Affiliation:
Crops Research Division, Agr. Res. Serv., U. S. Dep. of Agr. Federal Experiment Station, Mayaquez, Puerto Rico
Fred H. Tschirley
Affiliation:
Crops Research Division, Agr. Res. Serv., U. S. Dep. of Agr. Federal Experiment Station, Mayaquez, Puerto Rico
R. W. Bovey
Affiliation:
Crops Research Division, Agr. Res. Serv., U. S. Dep. of Agr., Texas A & M University, College Station, Texas
H. L. Morton
Affiliation:
Crops Research Division, Agr. Res. Serv., U. S. Dep. of Agr., Texas A & M University, College Station, Texas
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Abstract

We applied (2,4-dichlorophenoxy)acetic acid (2,4-D), (2, 4,5-trichlorophenoxy)acetic acid (2,4,5-T), 4-amino-3,5,6-trichloropicolinic acid (picloram), and 1,1′-dimethyl-4,4′-bipyridinium ion (paraquat) alone and in various combinations by aircraft on arborescent species in Texas and Puerto Rico. Paraquat defoliated trees rapidly but did not give long-term control. Picloram defoliated a greater number of species than the other herbicides and defoliation extended over a longer period. No treatment killed all trees in the mixed forest or prevented regrowth and secondary succession for a period of more than 1 year. Higher herbicide rates were necessary to defoliate woody plants in tropical Puerto Rico than in subtropical Texas.

Type
Research Article
Information
Weed Science , Volume 18 , Issue 1 , January 1970 , pp. 164 - 168
Copyright
Copyright © 1970 Weed Science Society of America 

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References

Literature Cited

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