Document Type

Thesis - Open Access

Award Date

1974

Degree Name

Master of Science (MS)

Department / School

Agronomy

Abstract

A new approach to controlling field bindweed is being evaluated and is the subject of this thesis. Recent research has found that field bindweed is effectively controlled by a uniform layer of trifluralin 4 to 6 inches beneath the soil surface. Field bindweed growth is contained beneath the layer. This method appears promising for eradication of field bindweed if the roots are physiologically weakened or food reserves depleted enough that eradication can be obtained prior to dissipation of the trifluralin layer. Trifluralin inhibits root growth on numerous plant species. These researchers generally found radial enlargement of the primary roots near the meristematic tip and decreased formation of secondary roots. Talbert reported that trifluralin's inhibition of soybean root growth was caused by blocking mitosis in the prophase stage. Bayer et al. and Lignowski and Scott agreed with Talbert on trifluralin's disruption of mitotic cycle but did not find specific stages of blocking of mitosis. However, Lignowski indicated possible blocking of metaphase along with inhibition of normal spindle apparatus formation. Since the literature indicates trifluralin does not translocate readily, a herbicide that is easily translocated through field bindweed roots might give better elimination of this weed if mixed with trifluralin. Dicamba is translocated rapidly in broadleaf plants; therefore, it was selected as a desirable complimentary herbicide. These results indicate that dicamba may be absorbed by either the roots or leaves of plants and readily translocated in both the apoplastic and symplastic plant systems. Experiments were initiated near Winner and Presho, S.D., to evaluate the control of field bindweed with subsurface layered treatments of trifluralin, dicamba, and combinations of these herbicides. The effect of subsurface treatments on the reserves of field bindweed roots were analyzed ii1 an experiment near Redfield, S.D. A laboratory study was conducted to trace the movement of these herbicides in the roots of field bindweed. The experimental areas at Winner and Presho were followed during the summer and planted to winter wheat in the fall. Experiments were conducted near Beresford and Redfield, S.D., to determine the toxicity of these herbicide treatment to corn.

Library of Congress Subject Headings

Weeds -- Control

Weeds -- South Dakota

Format

application/pdf

Number of Pages

51

Publisher

South Dakota State University

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