Evaluation of Weed Efficacy and Crop Safety of Fluorochloridone in China

Self Cite

Greenhouse and field studies were conducted to provide a reference for pre-emergence (PRE) application of isoxaflutole on maize in China. In greenhouse study, the isoxaflutole PRE application at 30 g active ingredient (a.i.) ha−1 could effectively control large numbers of weeds, especially some large-seeded broadleaves, tested in this study. The tolerance results indicated 21 maize hybrids showed different responses to isoxaflutole under greenhouse conditions. In 2015 and 2016, field experiments were conducted to determine and compare the weed control efficacy and safety to Zhengdan 958 maize with 6 herbicide treatments. In both years, isoxaflutole PRE at 100 to 250 g a.i. ha−1 was sufficient to provide satisfactory full-season control of the dominant common broadleaf and grass weeds in the field. Temporary injury to maize was observed with isoxaflutole treatments of 125, 150, and 250 g a.i. ha−1 in both years, but plants recovered within 4 to 6 wk. To maximize maize yield and provide satisfactory weed control, a range of 100 to 150 g a.i. ha−1 of isoxaflutole is recommended, depending on the soil characteristics, weather, and weed species present at the experimental site. Based on the results, isoxaflutole PRE has good potential for weed control in maize in China.

Section: Methodsmentioning

confidence: 99%

Greenhouse and field evaluation of isoxaflutole for weed control in maize in China

Zhao

Zuo

Wei

et al. 2017

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“…The widespread application of herbicides has led to the rapid evolution of A. aequalis and A. japonicus herbicide tolerance throughout the world. In some areas of China, A. aequalis has developed resistance to ALS inhibitors 26,27 , and/or ACCase inhibitors 27,28 , while A. japonicus has developed resistance to chlorsulfuron 28,29 , to fenoxaprop-P-ethyl 30–32 , to isoproturon 30 , and/or to pinoxaden 31 . Therefore, QYM201 will be helpful in controlling these resistant weeds.…”

Section: Discussionmentioning

confidence: 99%

“…After 28 days of treatment, wheat plants were cut off and put in an oven at 80 °C for 72 h, and then dry weights were recorded. In addition, the degree of herbicide damage to wheat seedlings was also recorded and expressed as values from 0 to 100%: 0% indicated no damage and 100% indicated total death 31 . Other experimental conditions were consistent with those described above for the greenhouse experiment.…”

Section: Methodsmentioning

confidence: 99%

Greenhouse and field evaluation of a novel HPPD-inhibiting herbicide, QYM201, for weed control in wheat

Zhang

Bai

Wang

et al. 2019

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QYM201, 1-(2-chloro-3-(3-cyclopropyl-5-hydroxy-1-methyl-1H-pyrazole-4-carbonyl)-6-(trifluoromethyl)phenyl)piperidin-2-one), is a newly developed HPPD- (4-hydroxyphenylpyruvate dioxygenase; EC 1.13.11.27) inhibiting herbicide for weed control. Experiments were carried out to determine the effect of QYM201 on weeds and its safety for wheat in the glasshouse and field. The results indicated that at doses of 90 and 135 g active ingredient (a.i.) ha−1 QYM201 was highly effective against both grass and broadleaf weeds, such as Alopecurus aequalis Sobol., Alopecurus japonicus Steud, and Capsella bursa-pastoris Medic. In a wheat hybrid tolerance experiment, QYM201 showed a high level of safety for most of the 17 tested wheat hybrids, and the SI values reached ≥5.7 in the selectivity index study. To determine application rules for QYM201, field experiments were conducted in 2016 and 2017. During this time, 90 to 270 g a.i. ha−1 post-emergence herbicide application (POST) was sufficient to supply satisfactory all-season control of Alopecurus aequalis Sobol., Descurainia sophia [L.] Schur., and Malachium aquaticum (L.) Fires. No damage to wheat plants was observed. In order to increase wheat yield and deliver effective weed control, a dosage of 90 to 180 g a.i. ha−1 is suggested. In conclusion, the herbicide QYM201 is safe to use in wheat fields to control winter weeds.

“…Other experimental conditions were the same as described in the greenhouse experiment design. Herbicide damage of the seedlings was visually estimated by independent assessors 21 d after treatment (DAT) using a scale of 0 to 100% (0 = no damage, 100 = total death) 18 . Observation of plant whitening was also recorded to describe treatment performance.…”

Section: Methodsmentioning

confidence: 99%

Evaluation of weed control efficacy and crop safety of the new HPPD-inhibiting herbicide-QYR301

Wang

Liu

Zhao

et al. 2018

Self Cite

QYR301, 1,3-Dimethyl-1H-pyrazole-4-carboxylic acid 4-[2-chloro-3-(3,5-dimethyl-pyrazol-1-ylmethyl)-4-methanesulfonyl-benzoyl]-2,5-dimethyl-2H-pyrazol-3-yl ester, is a novel HPPD-inhibiting herbicide and was evaluated to provide a reference for post-emergence (POST) application under greenhouse and field conditions. The crop safety (180 and 360 g active ingredient (a.i.) ha−1 treatments) experiment revealed that wheat, paddy, garlic and corn were the only four crops without injury at both examined herbicide rates. The weed control efficacy (60 and 120 g a.i. ha−1) experiment showed that QYR301 exhibited high efficacy against many weeds, especially weeds infesting paddy fields. Furthermore, it is interesting that both susceptible and multiple herbicide resistant Echinochloa crus-galli (L.) Beauv. and Echinochloa phyllopogon (Stapf) Koss, two notorious weed species in paddy field, remained susceptible to QYR301. Further crop tolerance results indicated that 20 tested paddy hybrids displayed different levels of tolerance to QYR301, with the japonica paddy hybrids having more tolerance than indica paddy hybrids under greenhouse conditions. Results obtained from field experiments showed that QYR301 POST at 135 to 180 g a.i. ha−1 was recommended to provide satisfactory full-season control of E. crus-galli and Leptochloa chinensis (L.) Nees and to maximize rice yields. These findings indicate that QYR301 possesses great potential for the management of weeds in paddy fields.