Study on weed control in clear rice field and the resistance of weedy rice species

doi:10.16178/j.issn.0528-9017.20240638

Abstract

Abstract:

The study aimed to explore the control effects of imidazolinone herbicides on common weeds and weedy rice in the fields of clear rice, as well as the resistance of different weedy rice species to imazethapyr. Field experiments were conducted to control various weeds by spraying different concentrations of imazethapyr solution at different stages, and pot experiments were conducted to identify the resistance of weedy rice. The results showed that spraying imazethapyr 20 days after rice seeding controlled weedy rice in the field effectively, with a control efficiency of 92.8% at a low concentration of 1 200 mL·hm^-2. Early application resulted in a control efficiency below 90% generally, while late application required higher dosages to achieve better control efficiency. Moderate and high concentrations of imazethapyr demonstrated good control efficiency against Echinochloa crusgalli and Leptochloa chinensis, but poor control against broadleaf weeds such as Ammannia multiflora and Ludwigia prostrata. The resistance identification results indicated that the weedy rice species from different regions tested were sensitive to imazethapyr, showing no significant resistance.

Key words: imazethapyr, clear field rice, weed control, species of weedy rice, resistance

CLC Number:

S451.21

XU Weidong, LU Qiang, YAO Zhangliang, LI Youfa, FU Haowei, ZHANG Xinyue, DONG Junjie, CAO Kuirong, MA Xinghua. Study on weed control in clear rice field and the resistance of weedy rice species[J]. Journal of Zhejiang Agricultural Sciences, 2024, 65(11): 2668-2671.

Figures/Tables 4

References 13

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药剂浓度/ (mL·hm^-2)	稗草	千金子	多花水苋	丁香蓼	异型莎草	杂草稻
3 600	96.0 a	97.0 a	90.8 a	—	100.0 a	88.3 a
2 400	95.0 a	87.4 a	31.7 b	—	98.6 a	89.9 a
1 800	91.0 b	90.2 a	48.9 b	—	100.0 a	86.5 a
1 200	88.2 b	95.2 a	47.2 b	—	100.0 a	86.7 a

药剂浓度/ (mL·hm^-2)	稗草	千金子	多花水苋	丁香蓼	异型莎草	杂草稻
3 600	96.0 a	97.0 a	90.8 a	—	100.0 a	88.3 a
2 400	95.0 a	87.4 a	31.7 b	—	98.6 a	89.9 a
1 800	91.0 b	90.2 a	48.9 b	—	100.0 a	86.5 a
1 200	88.2 b	95.2 a	47.2 b	—	100.0 a	86.7 a

药剂浓度/ (mL·hm^-2)	稗草	千金子	多花水苋	丁香蓼	异型莎草	杂草稻
3 600	100.0 a	98.3 a	84.7 a	84.1 a	96.0 a	97.7 a
2 400	100.0 a	90.7 a	63.3 b	82.2 a	14.0 b	96.9 a
1 800	74.1 b	60.6 b	51.9 b	79.3 a	19.1 b	96.5 a
1 200	16.0 c	15.1 c	52.2 b	1.5 b	32.2 b	92.8 a

药剂浓度/ (mL·hm^-2)	稗草	千金子	多花水苋	丁香蓼	异型莎草	杂草稻
3 600	100.0 a	98.3 a	84.7 a	84.1 a	96.0 a	97.7 a
2 400	100.0 a	90.7 a	63.3 b	82.2 a	14.0 b	96.9 a
1 800	74.1 b	60.6 b	51.9 b	79.3 a	19.1 b	96.5 a
1 200	16.0 c	15.1 c	52.2 b	1.5 b	32.2 b	92.8 a

药剂浓度/ (mL·hm^-2)	稗草	千金子	多花水苋	丁香蓼	异型莎草	杂草稻
3 600	50.6 a	72.7 a	87.3 a	77.8 a	88.6 a	94.6 b
2 400	25.7 b	69.2 a	43.4 b	-5.6 a	88.3 a	93.3 b
1 800	-8.4 c	-2.2 b	41.9 b	30.6 a	64.5 b	98.0 a
1 200	19.7 b	-52.1 c	20.6 b	-16.7 a	28.1 c	80.2 c