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Seasonal Susceptibility of Guava to Selected Herbicides

Published online by Cambridge University Press:  12 June 2017

Fred H. Tschirley ,
Rene T. Hernandez  and
Clyde C. Dowler
Fred H. Tschirley
Affiliation:
Crops Research Division, Agricultural Research Service, U.S. Department of Agriculture, Federal Experiment Station, Mayaguez, Puerto Rico
Rene T. Hernandez
Affiliation:
Crops Research Division, Agricultural Research Service, U.S. Department of Agriculture, Federal Experiment Station, Mayaguez, Puerto Rico
Clyde C. Dowler
Affiliation:
Crops Research Division, Agricultural Research Service, U.S. Department of Agriculture, Federal Experiment Station, Mayaguez, Puerto Rico
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Abstract

Treatments made at 2-week intervals on guava (Psidium guajava L.) with a 1:1 ratio of butoxyethanol esters of 2,4-dichlorophenoxyacetic acid:2,4,5-trichlorophenoxyacetic acid (2,4-D:2,4,5-T) have shown it to be more susceptible when treatments are made during the wet season than during the dry season. Greater susceptibility is related to a plant condition characterized by many new leaves but little or no terminal twig elongation. A similar pattern of defoliation response is caused by 2-methoxy-3,6-dichlorobenzoic acid (dicamba) and 2,3,6-trichloropicolinic acid (picloram) as by 2,4-D:2,4,5-T, but the period of maximum susceptibility based on defoliation percentages 1 year after treatment occurred later in the season.

Type
Research Article
Information
Weeds , Volume 15 , Issue 3 , July 1967 , pp. 217 - 219
Copyright
Copyright © 1967 Weed Science Society of America 

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References

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