Hedgehog dogtail (Cynosurus echinatus) is an annual grass, native to Europe, but also widely distributed in North and South America, South Africa, and Australia. Two hedgehog dogtail biotypes, one diclofop-methyl (DM)-resistant and one DM-susceptible were studied in detail for experimental dose-response resistance mechanisms. Herbicide rates that inhibited shoot growth by 50% (GR50) were determ...

This research was conducted to determine the efficacy of quizalofop (FirstAct) herbicide in herbicide-tolerant grain sorghum. FirstAct evaluated for and crop response Double Team (ACCase-tolerant) All herbicides controlled Palmer amaranth 90% or more volunteer corn 95% late season. Johnsongrass control 86 91%. Minor sorghum injury early season did not persist. Sorghum receiving postemergence yi...

Spain is the second highest rice-producing country in European Union, with approximately 105,000 ha used to grow this crop. The major regions are Andalusia, Extremadura, Catalonia, and Valencia, followed by Aragon Navarre. main soil texture throughout Spanish rice areas silty clay loam, alkaline soils (pH > 7.5)—except Extremadura area = 5.5–6)—and a low organic matter content. Water quality...

Johnsongrass is a nonnative invasive species introduced as a forage crop from the Mediterranean region (Miller and Miller 1999). This perennial species has become naturalized and is found in 47 of the 50 United States (Alaska, Minnesota, and Maine being the exceptions) (USDA 2004). Johnsongrass has become problematic along roadsides in Kentucky due to its aggressive and prolific nature and rapi...

The objective of this study was to compare FirstAct with several tank mix partners for efficacy in herbicide-tolerant grain sorghum. (quizalofop) alone or mixtures controlled Johnsongrass 94% more. However, mixing any broadleaf herbicide generally antagonistic Palmer amaranth control. Minor sorghum injury 5% less by four weeks after postemergence treatment. Sorghum yields increased all treatmen...

Italian ryegrass (Lolium multiflorum L.), a cross-pollinated grass, is gradually becoming predominant weed in wheat fields China and evolving resistance to many groups of herbicides. The aim this study determine the levels single L. population from field Henan Province China, three modes action (MoAs) herbicides further characterize potential mechanisms. This evolved multiple herbicide resistan...

Three perennial ryegrass (Lolium perenne) populations (R1, R2, and R3) with suspected resistance (R) to acetolactate synthase (ALS) or acetyl-CoA carboxylase (ACCase) herbicides were collected from wheat (Triticum aestivum) fields in northwestern Greece study the underlying mechanisms of their impact on growth rate competitive ability against wheat. Preemergence postemergence plant dose–respons...