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Herbicides for Release of Short-Leaf Pine and Native Grasses

Published online by Cambridge University Press:  12 June 2017

Harry M. Elwell
Harry M. Elwell*
Affiliation:
Crops Research Division, ARS, U. S. Department of Agriculture, Stillwater, Oklahoma
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Abstract

Aerial herbicide treatments were made on a native stand of short-leaf pine (Pinus echinata Mill.) heavily infested with noncommercial oak (Quercus sp.), hickory (Carya sp.), and associated species in southeastern Oklahoma from 1957 through 1960. Two formulations of 2,4,5-trichlorophenoxyacetic acid (2,4,5-T) were applied in May and September at 1½ lb/A annually in one, two, and three applications with the later two made a year apart. The most diameter growth for all sizes of pine measured occurred following May treatments. Late May aerial applications also were made with 2-(2,4-dichlorophenoxy) propionic acid (dichloroprop) and 2-(2,4,5-trichlorophenoxy) propionic acid (silvex). Silvex reduced pine cone development, seed fill, and germination.

Native grass growth was increased twice following good weed tree control. However, where dense short-leaf pine seedlings developed, the native grasses were smothered and volume of herbage decreased.

Type
Research Article
Information
Weeds , Volume 15 , Issue 2 , April 1967 , pp. 104 - 107
Copyright
Copyright © 1967 Weed Science Society of America 

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References

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