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Document Type

Thesis - University Access Only

Award Date


Degree Name

Master of Science (MS)

Department / School


First Advisor

David D. Walgenbach


A technique was developed to quantify volatilization losses of chlorethoxyfos and terbufos from soil in laboratory and field studies during 1988 and 1989 at Brookings, South Dakota. In laboratory studies, treatments were arranged in 16 experimental units, which represented four replications of four samples. Treatments included chlorethoxyfos 10G at 1.1 kg/ha and terbufos 15G at 1.1 kg/ha. In field studies, treatments were arranged in a randomized complete block design replicated four times. Treatments included the following: chlorethoxyfos 5GM, banded and in-furrow; and terbufos 15G, banded and in-furrow. Volatilization recovery results indicated that chlorethoxyfos and terbufos were most volatile when applied banded to the soil surface, with more than 75% of total recovery occuring [sic] from initial application to 11 days after application. Soil moisture and soil temperature affected recoveries of the insecticides with a diurnal pattern. Data from concurrent corn rootworm efficacy studies revealed no significant differences in pest control between banded and in-furrow treatments of chlorethoxyfos and terbufos. This suggests then, that the insecticides should be placed in-furrow to reduce volatilization losses. This document contains two manuscripts written for publication in entomological journals. Research for these studies was performed during 1988 and 1989 on the Corn Insects Research project at South Dakota State University.

Library of Congress Subject Headings

Soils -- Pesticide content
Soil degradation
Soil moisture
Soil temperature
Vapor density




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