The enzyme AHAS (acetohydroxy acid synthase), which is involved in the biosynthesis of valine, leucine and isoleucine, is the target of several classes of herbicides. A model of tobacco AHAS was generated based on the X-ray structure of yeast AHAS. Well conserved residues at the herbicide-binding site were identified, and the roles of three of these residues (Phe-205, Val-570 and Phe-577) were ...

Two studies examined the compatibility between herbicide release of red or jack pine plantations in Wisconsin and the maintenance of Karner blue butterfly (Lycaeides melissa samuelis), a federally listed endangered species. Wisconsin has some of the few remaining viable metapopulations of Karner blue butterfly, hereafter abbreviated as KBB. The habitats favored by KBB are also the sites well su...

Herbicides are widely used as an important alternative to prevent excessive growth of weeds in agricultural crop land, particularly where conservation tillage is adopted. Weeds reduce crop yield and quality, interfere with cultivation and harvest operations and seem to be the most economically important of all pests with respect to sales of pesticides worldwide. As an interesting side effect, t...

The Environmental Hazards Assessment Program of the California Department of Food and Agriculture conducted a well survey in Tulare County to determine the presence of the herbicides simazine, atrazine, prometon, bromacil and diuron in well water. These herbicides were chosen because of their use on crops grown in Tulare County and on rights-of-way throughout the state. Twelve sampling areas we...

in order to study of efficiency total dual purpose herbicide and mixed granestar and acsiyal herbicides, and response of wheat at growth various stages to the aforementioned herbicides, an experiment with randomized complete block design with three replications were conducted during 2008-2009 in a field experiment at ramin agricultural and natural resources university, khouzestan. treatments in...

With the goal of reaching scientifically supported conclusions about the health effects of the five herbicides used on Northern Arizona University’s campus, this literature search was carried out over a span of several months. Scientific databases, journals, and websites were searched through for relevant, published, and peer-reviewed studies. The methodologies and results of these studies were...

Treatments wilh the herbicides chlorpropham (isopropyl m-chlorocarbinilate), DCPA (dimethyl tetrachloroterephthalate), and El'TC (S-ethyl dipropylthiocarbamate), alone or in combination with Meloidogyne hapla Chilwood, significantly reduced the growth of both nemalode-resistant 'Nev Syn XX' atttt susceptible 'Ranger" alfalfa (Medicago saliva L.) seedlings. M. hapla infection of both alfalfas wa...

To be effective, herbicides must enter the plant. This process can occur very quickly or very slowly, depending on the herbicide, formulation, plant, and environmental conditions. For foliar applied (postemergence) herbicides, penetration and uptake can occur through cracks in the leaf surface, stomatal cavities, or by diffusion through the cuticle. Other surface features of the leaf such as tr...