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Response of Tropical Vegetation to Herbicides

Published online by Cambridge University Press:  12 June 2017

R. W. Bovey ,
C. C. Dowler  and
J. D. Diaz-Colon
R. W. Bovey
Affiliation:
Crops Research Division, Agr. Res. Ser., U. S. Dep. of Agr., Federal Experiment Station, Mayaguez, Puerto Rico
C. C. Dowler
Affiliation:
Crops Research Division, Agr. Res. Ser., U. S. Dep. of Agr., Federal Experiment Station, Mayaguez, Puerto Rico
J. D. Diaz-Colon
Affiliation:
Crops Research Division, Agr. Res. Ser., U. S. Dep. of Agr., Federal Experiment Station, Mayaguez, Puerto Rico
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Abstract

Several herbicides and herbicide combinations were investigated for desiccation, defoliation, and killing of tropical vegetation near Mayaguez, Puerto Rico. Hydroxydimethylarsine oxide (cacodylic acid) was one of the more effective defoliants on guava (Psidium guajava L.) within 2 weeks after treatment. However, several herbicide combinations including contact: growth-regulator types were more effective 1 month after spraying. Six months after treatment, herbicides containing (2,4-dichlorophenoxy)-acetic acid (2,4-D), (2,4,5-trichlorophenoxy)acetic acid (2,4,5-T), or 4-amino-3,5,6-trichloropicolinic acid (picloram) were superior to contact herbicides in controlling regrowth. In a mixed tropical forest, most rapid desiccation and defoliation of vegetation was produced by 6,7-dihydrodipyrido (1,2-a:2′,1′c) pyrazinediium salt (diquat) within 2 weeks after treatment. At 1 month after treatment and longer, the 1:1 mixture of the butyl ester of 2,4-D:2,4,5-T and a 2:2:1 mixture of the isooctyl esters of 2,4-D:2,4,5-T:picloram were superior to other herbicides.

Type
Research Article
Information
Weed Science , Volume 17 , Issue 3 , July 1969 , pp. 285 - 290
Copyright
Copyright © 1969 Weed Science Society of America 

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References

Literature Cited

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