Carbohydrate Levels and Control of Blackjack Oak and Winged Elm Treated with Tebuthiuron and 2,4,5-T

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Abstract
The effects of tebuthiuron [N-[5(1,1-dimethylethyl)-1,3,4-triadiazol-2-yl]-N, N'' dimethylurea) and 2,4,5-T[(2,4,5-trichlorophenoxy] acetic acid] on total nonstructural carbohydrates (TNC) in the roots of blackjack oak (Quercus marilandica Muench.) and winged elm (Ulmus alata Michx) were evaluated. Tebuthiuron was applied to the soil in Feb. 1976 at 2.24 kg/ha and 2,4,5-T was foliar applied at 2.24 kg/ha in May 1976. Tree kill 1 yr after treatment with tebuthiuron was 100% for both woody species. No tree kill resulted from treatment with 2,4,5-T, and canopy reduction after 1 yr was 50 and 70% for winged elm and blackjack oak, respectively. The TNC content of both winged elm and blackjack oak roots was significantly reduced following application of 2,4,5-T and tebuthiuron. The TNC content of roots from trees growing tebuthiuron-treated areas did not significantly increase after treatment (TNC contents of 6 and 7%, respectively, for blackjack oak and winged elm on Oct. 13). There was some increase in TNC content of roots from trees sprayed with 2,4,5-T, and by Oct. the TNC content in blackjack oak and winged elm roots was 10 and 19%, respectively. This compared to TNC contents of 36 and 32%, respectively for untreated blackjack oak and winged elm.

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