Crops ›› 2022, Vol. 38 ›› Issue (4): 262-266.doi: 10.16035/j.issn.1001-7283.2022.04.037

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Sensitivity of Foxtail Millets (Setaria italica L.) and Weeds to Cyhalofop-Butyl

Li Binghua1(), Wang Guiqi1, Shi Zhigang2, Liu Xiaomin1, Xu Xian1, Zhao Bochui1, Cheng Ruhong2()   

  1. 1Key Laboratory of Crop Cultivation Physiology and Green Production of Hebei Province/Institute of Cereal and Oil Crops, Hebei Academy of Agriculture and Forestry Sciences, Shijiazhuang 050035,Hebei, China
    2Cereal Crops Laboratory of Hebei Province/Institute of Millet Crops, Hebei Academy of Agriculture and Forestry Sciences, Shijiazhuang 050035, Hebei, China
  • Received:2021-04-13 Revised:2021-09-24 Online:2022-08-15 Published:2022-08-22
  • Contact: Cheng Ruhong E-mail:libh197@163.com;rhcheng63@126.com

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Abstract:

Bioassay experiment and field plot test were executed to examine the weed sensitivity of cyhalofop-butyl and its safety on foxtail millet for providing theoretical guidance for the application of cyhalofop-butyl in millet field. The results of the laboratory bioassay test showed that Eleusine indica L. was highly sensitive (GR90=45.02g a.i./ha) to cyhalofop-butyl and Setaria faberii Herrm. was commonly sensitive (GR90=124.13g a.i./ha) to it. The selection index of cyhalofop-butyl between Jigu 39 and weeds was higher than 2 and Jigu 39 showed low sensitivity (GR10=284.05g a.i./ha) to cyhalofop-butyl. The selection index of Yugu 18 was below 1 and Yugu 18 showed highly sensitive (GR10=13.70g a.i./ha) to it. The resistant index of Jigu 39 was 9.65. Field test results further showed that cyhalofop-butyl could effectively control grassy weeds in the herbicide-resistant millet field. It had high control effect to E. indica and Digitaria sanguinalis L., both of biomass and number control effect were higher than 96% at the dose of 110g a.i./ha. It also had a significant inhibitory effect on S. faberii and the biomass control effect was higher than 80%. Biomass and plant height of Jigu 39 were unaffected by cyclofop-butyl. According to the study, Yugu 18 shown great susceptibility to cyhalofop-butyl while Jigu 39, a herbicide-resistant millet type, was resistant to it. In a field of herbicide-resistant millet, using cyhalofop-butyl wisely could successfully suppress grass weeds.

Key words: Foxtail millet, Weed, Cyhalofop-butyl, Sensitivity, Herbicide-resistance

Table 1

Experimental plant and herbicide dosage for biomass assay g a.i./hm2"

处理
Treatment		 豫谷18
Yugu 18		 冀谷39
Jigu 39		 谷莠子
S. faberii		 牛筋草
E. indica
氰氟草酯
Cyhalofop-butyl		 15.625 200 15.625 15.625
31.250 250 31.250 31.250
62.500 300 62.500 62.500
125.000 350 125.000 125.000
250.000 400 250.000 250.000
空白对照Control – – –

Fig.1

Fresh weight control effects of cyhalofop-butyl on weeds"

Table 2

The sensitivity of weeds to cyhalofop-butyl"

杂草
Weed		 回归方程
Regression
equation		 相关
系数
r		 95%置信限
95% confidence limit (g a.i./hm2)
GR50 GR90
牛筋草
E. indica		 y =3.00+1.99x 0.94 10.19
（4.29~24.23）		 45.02
（29.16~69.51）
谷莠子
S. faberii		 y =2.88+1.63x 0.98 20.22
（14.27~28.66）		 124.13
（93.88~164.11）

Table 3

Determine the sensitivity of millet to cyhalofop-butyl"

谷子
Millet		 回归方程
Regression equation		 相关系数
r		 95% 置信限95% confidence limit (g a.i./hm2) RI
GR10 GR50
豫谷Yugu 18 y=1.33+2.10x 0.94 13.70（6.25~30.04） 55.86（35.57~87.73） 1.00
冀谷Jigu 39 y=4.61x-7.59 0.91 284.05（251.05~321.40） 538.94（386.65~751.20） 9.65

Table 4

Selection indexes of cyhalofop-butyl between millet varieties and weeds"

材料
Material		 剂量
Dosage		 谷子
Millet		 牛筋草
E. indica		 谷莠子
S. faberii
豫谷Yugu 18 GR10 13.70
杂草Weed GR90 45.02 124.13
选择性指数SI 0.30 0.11
冀谷Jigu 39 GR10 284.05
杂草Weed GR90 45.02 124.13
选择性指数SI 6.31 2.29

Table 5

Weed control effects of cyhalofop-butyl after application 18d"

氰氟草酯
Cyhalofop-butyl
(g a.i./hm2)		 株数防效Control effect of plant number (%) 鲜重防效Fresh weight control effect (%)
马唐
D. sanguinalis		 牛筋草
E. indica		 谷莠子
S. faberii		 杂草合计
Overall of weed		 马唐
D. sanguinalis		 牛筋草
E. indica		 谷莠子
S. faberii		 杂草合计
Overall of weed
40 54.5c 37.0b 0.0c 9.3c 30.7d 83.1b 45.3b 53.5b
55 69.7bc 87.4a 11.5bc 45.2b 54.3c 95.2ab 43.3b 55.7b
70 78.8b 92.9a 19.1b 52.2b 77.5b 97.5a 47.5b 60.2b
110 97.0a 100.0a 67.2a 82.2a 97.1a 100.0a 80.5a 85.6a

Fig.2

Effects on Jigu 39 plant height and fresh weight after cyhalofop-butyl application 18 days Different letter indicate significant different between treatments at 0.05 level"

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