ZEDAKER, S.M., GREGOIRE, T.G., and MILLER, J.H. 1993. Sample-size needs for forestry herbicide trials. Can. J. For. Res. 23: 2153-2158. Forest herbicide experiments are increasingly being designed to evaluate smaller treatment differences when comparing existing effective treatments, tank mix ratios, surfactants, and new low-rate products. The ability to detect small differences in efficacy is ...

Limited information is available on control of broadleaf weeds in barley and response of barley cultivars to herbicides. Field experiments were conducted from 2007 to 2009 to evaluate post-emergence herbicides for control of broadleaf weeds in four barley cultivars. Herbicide treatments included 2,4-D sodium salt at 500 g ai ha 1, carfentrazone-ethyl at three rates (15, 20 and 25 g ai ha 1), an...

Common ragweed emerges early in the season in Nebraska, USA and is competitive with soybean; therefore, preplant herbicides are important for effective control. Glyphosate has been used as a preplant control option; however, confirmation of glyphosate-resistant (GR) common ragweed in Nebraska necessitates evaluating other herbicide options. The objectives of this study were to (1) evaluate the ...

Abstract Water is the primary carrier for herbicide applications. Spray water qualities such as pH, hardness, temperature, or turbidity can influence performance and may need to be amended optimum weed control. quality factors affect activity by reducing solubility, enhancing degradation in spray tank, forming herbicide-salt complexes with mineral cations, thereby absorption, translocation, sub...

In the southern United States, herbicide use continues to increase for timber management in commercial pine (Pinus spp.) plantations, for mod@ing wildlife habitats, and for invasive plant control. Several studies have reported that single applications of forestry herbicides at stand initiation have minor and temporary impacts on plant communities and wildlife habitat conditions, with some repor...

A key enabling factor for treating individualized weeds in the crops is Automatic Weeding Control device (AWCd) as it being capable of finding and distinguishing field. The non-herbicide approaches used to manage are a component personalized treatment weed crops. In this study, mechanical control techniques investigated an alternative. three specifications—a cutting mechanism, head-surface till...

Weed control efficacy of three herbicides recently registered for use in the South African Sugar Industry is discussed and the phytotoxic effects on sugarcane are presented. Destun, with or without atrazine, is a safe pre-emergence treatment which is useful for the control of Cyperus esculentus, grasses and broadleaf weeds, while some activity on Cyperus rotundus has also been recorded. Dual + ...

A study was conducted to determine the efficacy of a combination of ametryn plus glyphosate or glufosinate in tank-mixtures on the control of goosegrass at the 3to 4tiller growth stage under glasshouse and field conditions. In the glasshouse, seven of the nine herbicide combinations were additive, while two of them were antagonistic when goosegrass was treated with combinations of ametryn plus ...

Bermudagrass is often overseeded with a cool-season grass species in the fall to provide a green surface during cool weather. Recently, two new turfgrass species, meadow fescue and tetraploid ryegrass, have shown promise for use in overseeding situations. The objective of this study was to determine the performance of herbicides commonly used to remove (transition) perennial ryegrass from an ov...

Six field trials were conducted over three growing seasons to evaluate both pre-and post-emergence applications of the recently developed herbicide mesotrione, for weed control in maize. As a pre-emergence treatment it provided excellent control of broadleaf weeds (>99% reduction in dry matter) but was poor on grass weeds (ca 80% reduction). However, its combination with atrazine, s-metolachlor...