Activity of mesotrione on resistant weeds in maize

Abstract

Mesotrione is a new callistemone herbicide that inhibits the HPPD enzyme (p-hydroxyphenylpyruvate dioxygenase) and introduces a new naturally selective tool into weed-management programmes for use in maize. Mesotrione provides control of the major broad-leaved weeds, and it can be used in integrated weed-management programmes depending on the grower's preferred weed-control strategy. At post-emergence rates of 150 g AI ha-1 or less, mesotrione provides naturally selective control of key species that may show triazine resistance (TR), e.g. Chenopodium album L, Amaranthus species, Solanum nigrum L, as well as species of weed that show resistance to acetolactase synthase (ALS) inhibitors e.g. Xanthium strumarium L, Amaranthus spp and Sonchus spp. The data presented show that resistant and susceptible biotypes of these species with resistance to triazine herbicides, such as atrazine, simazine, terbutylazine and metribuzin, or ALS-inhibitor herbicides, such as imazethepyr, remain susceptible to mesotrione. These results confirm that there is no cross-resistance in biotypes with target site resistance to triazine or ALS-inhibiting herbicides. It is important that herbicide choice and rotation becomes an integral part of planning weed management, so as to minimise the risks of crop losses from weed competition, build-up of weed seed in the soil and the further development of weed resistance across a range of herbicide modes of action.

Broadleaf Weed Management in Corn Utilizing Synergistic Postemergence Herbicide Combinations

“…Results from previous studies demonstrated the synergism between mesotrione and PSII inhibitors applied POST (Abendroth et al 2006;Hugie et al 2008;Sutton et al 2002), PRE (Bollman et al 2006), or in PRE-POST sequential applications (Woodyard et al 2009) under greenhouse and field conditions. An objective of the current study was to determine the nature of any interactions between HPPD-and PSII-inhibiting herbicides across a range of rates at different time periods following application, with the ultimate goal of utilizing synergistic herbicide combinations for broadleaf weed management in corn.…”

Structural and mechanistic comparisons of the metal-binding members of the vicinal oxygen chelate (VOC) superfamily

“…Higher organisms, however, make use of the pathway primarily to prevent accumulation of tyrosine in the blood (a relatively insoluble amino acid) [73,74]. In plants, HG is a precursor to plastoquinone and tocopherol, both vital to photosynthesis [75][76][77][78][79], and herbicides based on HPPD inhibition are in large-scale use worldwide [80][81][82][83][84]. In a significant number of bacterial and fungal species, pyomelanins that are the oxidative polymerization products of HG have been discovered to serve a variety of important functions, including to stave off oxidative stress [85][86][87][88][89][90][91].…”

Herbicide Program Approaches for Managing Glyphosate-Resistant Palmer Amaranth (Amaranthus palmeri) and Waterhemp (Amaranthus tuberculatusandAmaranthus rudis) in Future Soybean-Trait Technologies

“…Furthermore, mesotrione and isoxaflutole (HPPD-inhibitors) are effective at controlling Amaranthus spp. Sutton et al 2002). The objective of this research was to evaluate current and future herbicide programs that contain multiple, effective herbicide sites of action for the control of waterhemp and Palmer amaranth in six states located in soybeangrowing regions of the United States.…”