Jerry L. Michael

Learn More
Imidacloprid is a systemic insecticide effective in controlling the exotic pest (hemlock woolly adelgid) in eastern hemlock () trees. Concerns over imidacloprid impacts on nontarget species have limited its application in southern Appalachian ecosystems. We quantified the movement and adsorption of imidacloprid in forest soils after soil injection in two(More)
We have used thermospray LC-MS to confirm three highly polar metabolites (A, B. and G) of the herbicide hexazinone [3-cyclohexyl-6-(dimethylamino)-l-methy~-1,3.S-triazine-2,4( lH,3H)-dione]. and chemical ionization GC-MS to confirm two other metabolites (D and E) in extracts of soil and vegetation from a forest in the Central Alabama Piedmont. Selected-ion(More)
A review of the fate and environmental risks associated with the use of hexasinone, imasapyr, sulfometuron methyl, and triclopyr in pine silviculture in the South is presented. Herbicides used in forestry can contaminate surface waters to varying degrees depending on the application rate , method of application, product formulation, and site specific(More)
The herbicide triclopyr (3,5,6-trichloro-2-pyridinyl)-oxyacetic acid has been marketed by the Dow Chemical Co. since the mid 1970’s as the triethylammonium salt (Garlon 3A) and as the ethylene glycol butyl ether ester (Garlon 4). Shortly after its introduction, McKellar (1977) published a method for the extraction, isolation, and electron capture gas(More)
Picloram (4-amino-3,5,6-trichloropicolinic acid) was aerially spplied to P longleaf pine (Pinus pduslris L.) site in the upper constnl plain of Alabama to control kudzu [Purraria lobota (Willd.) Ohwi]. Pellets (10% 8.i.) were spread at the rate of 56 kg ha ’ on loamy sand Typic Knnhspludult soils. Movement of this herbicide was monitored with mineral soil(More)
A modification of the GLEAMS model was used to determine application windows which would optimise efficacy and environmental safety for herbicide application to a forest site. Herbicide/soil partition coefticients were determined using soil samples collected from the study site for two herbicides (imazapyr, K,=46, triclopyr ester,(More)
Environmental interest groups have traditionally equated herbicide use with degradation of water quality. If the entire water quality picture is rationally analyzed. the conclusions are quite the contrary. Use of herbicides compared to mechanical site preparation improves or maintains water quality. Short-duration pulses of residues may appear in(More)
Increased herbicide use in silviculture over the last several decades has led to concern over potential water contamination, which may affect biotic health. In the southeastern United States, pine flatwoods are important for timber production and are often interspersed with cypress wetlands. Cypress domes are isolated, shallow basins that collect surficial(More)