Characterization of carinata tolerance to select herbicides using field dose-response studies

Abstract

Field experiments were conducted from 2017 to 2019 to determine the tolerance of carinata to several preemergence and postemergence herbicides. Preliminary screenings identified herbicides which caused large variation on carinata injury, indicating the potential for selectivity. Dose-response field studies were conducted to quantify the tolerance of carinata to select herbicides. Diuron applied preemergence at rates of 280 g ai ha−1 or above reduced carinata population density 54% to 84% compared to the nontreated control. In certain locations, clomazone applied preemergence caused minor injury with an acceptable level of carinata tolerance and only doses above 105 g ai ha−1 caused yield reductions. Napropamide doses of 2,856 g ai ha−1 or higher applied preemergence caused at least 25% injury to carinata; however, the damage was not severe enough to reduce yields. Simazine applied postemergence at rates above 1,594 g ai ha−1 caused 50% or more injury, resulting in yield losses ranging from 0 to 95% depending on location. Clopyralid applied postemergence at 2,512 g ai ha−1 caused 25% injury with relative yield reductions which varied across locations. The present study identified clomazone and napropamide applied preemergence, and clopyralid applied postemergence as potential herbicides for weed control in carinata. In contrast, diuron, simazine, metribuzin, imazethapyr, and chlorimuron caused high levels of carinata mortality and can be used to control volunteer carinata plants in rotational crops.

Signal, Not Poison—Screening Mint Essential Oils for Weed Control Leads to Horsemint

“…To put this into perspective in relation to commercial herbicides, a comparative dose-response study on Brassica carinata in different regions of the US (as a reference for L. sativum in the current study) can serve as a comparison. Using a spray of 187 L•ha −1 , around 500-1000 g•ha −1 of diuron (corresponding to 2670 to 5340 ppm), 1000-2000 g•ha −1 of simazine (corresponding to 2670 to 10,680 ppm), and >10,000 g•ha −1 of napropamide (corresponding to 53,400 ppm) were needed to reach a 50% suppression [24] based on a nozzle setting of 187 L•ha −1 , which is several orders of magnitude higher than the concentrations required for the essential oils. Thus, the first criterion-activity at low concentration-is certainly met.…”

“…With respect to differential susceptibility, a combination of wheat and barley (both relatively resistant) and a brassicaceous weed would be a feasible candidate to develop a plant protection strategy. For instance, herbicide-resistant Brassica carinata has turned into a pertinent weed in Australia [24,25] and needs to be controlled with glyphosate, because chlorsulfuron, metosulam, and imazethapyr have lost their efficacy.…”

Using weed emergence and phenology models to determine critical control windows for winter-grown carinata (Brassica carinata)

“…In the southeastern United States, the underutilized winter season and the market opportunity for oilseeds have stimulated interest in this crop (Adegbeye et al 2020;Hagos et al 2020). However, due to the limited number of registered herbicides in carinata, weed management will need to be well timed to meet the expected yields (Ethridge et al 2021;Leon et al 2017).…”

Evaluation of imazapic and flumioxazin carryover risk for Carinata (Brassica carinata) establishment

“…Due to carinata's recent introduction as a rotational winter crop in the United States, there is limited information about the agronomic practices needed to attain high yields sustainably (Mulvaney et al 2019). Specifically, there are few reports about weed control and carinata tolerance to herbicides (Ethridge et al 2021;Leon et al 2017).…”