Screening and Evaluation of Fungicides for Control of Rice False Smut Caused by Ustilaginoidea virens

doi:10.11923/j.issn.2095-4050.cjas20191200323

Abstract

Abstract:

The study aims to screen out effective fungicides against rice false smut (caused by Ustilaginoidea virens) by indoor toxicity determination and field efficacy trial. Indoor toxicities of 9 fungicides against U. viren were tested by using mycelium growth rate method, and the control effects of 7 fungicides on rice false smut were detect in field trials. Indoor toxicity data revealed that epoxiconazole, pyraclostrobin, prothioconazole, azoxystrobin, propiconazole, prochloraz and tebuconazole had obvious inhibitory effect with EC₅₀value of less than 0.20 μg/mL. Field trial results demonstrated that 430 g/L tebuconazole SC of 96.75 g a.i./hm², 125 g/L epoxiconazole SC of 84.4 g a.i./hm², 250 g/L azoxystrobin SC of 225.0 g a.i./hm²had excellent control effect of 83.59%, 82.77%, 81.13%, respectively. Therefore, tebuconazole, epoxiconazole and azoxystrobin are ideal fungicides for controlling rice false smut, and could be recommended to application in field.

Key words: Rice False Smut, Ustilaginoidea Virens, Fungicides, Toxicity Test, Field Control Effect

CLC Number:

S482.2

Fu Yuhang, Ma Hui, Cai Junsong, Peng Furong, Bi Chaowei. Screening and Evaluation of Fungicides for Control of Rice False Smut Caused by Ustilaginoidea virens[J]. Journal of Agriculture, 2021, 11(5): 18-21.

Figures/Tables 2

References 31

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药剂	毒力回归方程	相关系数	EC₅₀/(μg/mL)	95%置信区间/(μg/mL)
氟环唑	y=3.9070+2.2817x	0.9904	0.0194	0.0151~0.0250
吡唑醚菌酯	y=2.3868+1.6781x	0.9664	0.0378	0.0313~0.0447
丙硫菌唑	y=0.9594+1.3460x	0.9418	0.1937	0.1092~0.4041
丙环唑	y=2.0459+1.2548x	0.9808	0.0234	0.0189~0.0294
咪鲜胺	y=1.7181+1.2926x	0.9889	0.0469	0.0381~0.0584
戊唑醇	y=2.7648+1.6908x	0.9808	0.0232	0.0159~0.0331
啶酰菌胺	y=-1.6524+0.7266x	0.9894	188.0897	110.3980~470.6376
噻呋酰胺	y=-4.4980+1.7190x	0.9965	413.7360	334.4232~549.0896

药剂	毒力回归方程	相关系数	EC₅₀/(μg/mL)	95%置信区间/(μg/mL)
氟环唑	y=3.9070+2.2817x	0.9904	0.0194	0.0151~0.0250
吡唑醚菌酯	y=2.3868+1.6781x	0.9664	0.0378	0.0313~0.0447
丙硫菌唑	y=0.9594+1.3460x	0.9418	0.1937	0.1092~0.4041
丙环唑	y=2.0459+1.2548x	0.9808	0.0234	0.0189~0.0294
咪鲜胺	y=1.7181+1.2926x	0.9889	0.0469	0.0381~0.0584
戊唑醇	y=2.7648+1.6908x	0.9808	0.0232	0.0159~0.0331
啶酰菌胺	y=-1.6524+0.7266x	0.9894	188.0897	110.3980~470.6376
噻呋酰胺	y=-4.4980+1.7190x	0.9965	413.7360	334.4232~549.0896

药剂	剂量/(g a.i./hm²)	病情指数	防治效果/%
430 g/L戊唑醇SC	96.75	0.49	83.59 a
250 g/L吡唑醚菌酯EC	93.75	0.77	74.57 b
250 g/L嘧菌酯SC	225	0.57	81.13 a
125 g/L氟环唑SC	84.4	0.52	82.77 a
250 g/L丙环唑EC	131	0.72	76.21 b
10%丙硫菌唑SC	99	1.01	66.37 c
45%咪鲜胺ME	270	1.04	65.55 c
CK	—	3.01	—

药剂	剂量/(g a.i./hm²)	病情指数	防治效果/%
430 g/L戊唑醇SC	96.75	0.49	83.59 a
250 g/L吡唑醚菌酯EC	93.75	0.77	74.57 b
250 g/L嘧菌酯SC	225	0.57	81.13 a
125 g/L氟环唑SC	84.4	0.52	82.77 a
250 g/L丙环唑EC	131	0.72	76.21 b
10%丙硫菌唑SC	99	1.01	66.37 c
45%咪鲜胺ME	270	1.04	65.55 c
CK	—	3.01	—