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  • Author or Editor: R. A. Creager x
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Abstract

During 1978 and 1979, oxadiazon [2-ferf-butyl-4-(2-,4-dichloro-5-isopropoxyphenyl)-1,3,4-oxadiazolin-5-one] and oxyfluorfen [2-chloro-1-(3-ethoxy-4-nitrophenoxy)-4-(trifluoromethyl)benzene] were evaluated on 7 species of container-grown ornamentals for full season weed control, phytotoxicity, and final plant size. Based on these experiments, both herbicides provided 75% or better weed control for a 4 month period when applied at recommended and higher rates. Neither herbicide caused any significant plant injury to the 7 species when applied at 4 times the recommended rate. The largest plants were produced in containers treated with the herbicide rates providing the best weed control, and also in the weeded controls.

Open Access
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Abstract

Twenty-three plastic and fibrous materials were tested in the greenhouse to determine their growth suppression capacity on herbaceous and woody plants. Promising treatments were then applied under field conditions. Materials which controlled vegetation most effectively were rigid urethane foam (a new mulch material), fiberglass mat, fiberglass mat over black polyethylene film, and burlap impregnated with either tert-butylcarbamic acid ester with 3-(m-hydroxyphenyl)-1,1-dimethylurea (karbutilate), or 5-bromo-3-sec-butyl-6-methyluracil (bromacil).

Open Access

Abstract

Low levels of 7-oxabicyclo(2,2,1)heptane-2,3-dicarboxylic acid (endothall), ranging from 37.5 to 300 ppm, combined with 1000 ppm of (2-chloroethyl)phosphonic acid (ethephon) and sprayed on pin oak (Quercus palustris Muenchh.) seedling sprouts in the greenhouse caused temporary defoliation during the initial stages of leaf development. Defoliation was 75 to 86% with a 75 ppm endothall/1000 ppm ethephon combination applied during the first 27 days of leaf expansion. In field trials a 75 ppm/1000 ppm, endothall/ethephon combination defoliated 85% of 17 year-old pin oak trees in the expanding leaf stage. Shoot damage was negligible and foliar density of field trees reached 90% of control 10 weeks after defoliation.

Open Access

Abstract

A miniature pressure injector (mini-injector) was designed specificially to introduce solutions into the vascular system of seedlings and branches of woody plants for research purposes. The mini-injector consists of modified Vise-Grip locking pliers, a stainless steel tapered barrel and disposable syringe. Azo sulfamide dye was successfully injected into 4 species of container-grown fruit trees and 12 species of shade trees. Injections were more consistently effective in June, August, and October than in April. Diffuse-porous species were generally more receptive to injection, especially before bud break, than ring-porous species.

Open Access

Abstract

N-pyrrolidino succinamic acid (Uni-F529) was considerably superior to succinic acid 2,2 dimethyl hydrazide (daminozide, SADH) in inhibiting stem elongation in Phaseolus vulgaris F. ‘Black Valentine’ and Chrysanthemum morifolium Ramat. ‘Bright Golden Anne’. This was true in winter or summer greenhouses. Under controlled temperature and light conditions tissue concentrations of daminozide were higher than those for Uni-F529. Neither daminozide nor Uni-F529 was metabolized significantly in beans during the 3 to 7 day test periods. The greater activity of the pyrrolidino analog relative to daminozide must reflect increased activity at the site of action and/or reduced storage of Uni-F529 at inactive sites in plants.

Open Access