Co-toxicity and Field Control Efficacy of Mixtures of Bemystrobin and Tebuconazole to Fusarium head blight Caused by Gibberella zeae (Schw.) Petch

doi:10.11924/j.issn.1000-6850.casb2022-0893

Abstract

Abstract:

In order to exploit a new reagent for controlling fusarium head blight (FHB), the co-toxicity of mixtures of bemystrobin and tebuconazole to Gibberella zeae (Schw.) Petch and the field control efficacy of mixtures of bemystrobin and tebuconazole to FHB and DON in wheat grain and wheat powdery mildew (WPM) had been measured, respectively. The indoor toxicity of bemystrobin, tebuconazole and their eleven mixtures on G. zeae (Schw.) Petch had been detected by using mycelium growth rate method, and the field control tests of the optimum formulation had been conducted. The results of indoor toxicity tests showed that the mixture of bemystrobin and tebuconazole at the ratio of 1:9 with the synergistic coefficients of 2.0804 could provide most significant synergistic effect. The results of the field control efficacy showed that the FHB disease index (DI) and DON control efficacy of 37% bemystrobin·tebuconazole SC 450 g/hm² were 92.86% and 89.49%, respectively, while the control efficacy against WPM DI on the 21^th day after 2 times of spraying were 85.84%, both of which were higher than the control efficacy of the common fungicide carbendazim or tebuconazole, and it was safe for wheat growth. 37% bemystrobin·tebuconazole SC provided excellent control efficacy on FHB and DON in wheat grain, and provided good simultaneous control efficacy on WPM, which can be developed as a FHB control agent.

Key words: fusarium head blight, deoxynivalenol, bemystrobin, tebuconazole, co-toxicity, control efficacy

CHEN Hongzhou, WANG Bingbing, ZHANG Xinjian, YANG Hongfu, XU Chao, MIAO Kang, ZHANG Jianhua, ZHU Feng. Co-toxicity and Field Control Efficacy of Mixtures of Bemystrobin and Tebuconazole to Fusarium head blight Caused by Gibberella zeae (Schw.) Petch[J]. Chinese Agricultural Science Bulletin, 2023, 39(30): 132-137.

Figures/Tables 3

References 24

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处理	毒力回归方程	相关系数(r)	EC₅₀(Eob)及(95%FL)/(μg/mL)	EC₅₀(Eth)/(μg/mL)	增效系数(SR)
苯醚菌酯	y=4.5379+0.6294x	0.9979	5.4221(4.9936-5.8873)	-	-
戊唑醇	y=5.4885+1.0228x	0.9972	0.3329(0.3030-0.3658)	-	-
苯醚菌酯:戊唑醇(11:1)	y=4.6135+1.0048x	0.9840	2.4248(1.8399-3.1957)	2.3844	0.9833
苯醚菌酯:戊唑醇(9:1)	y=4.7117+0.9662x	0.9955	1.9879(1.7391-2.2722)	2.1442	1.0786
苯醚菌酯:戊唑醇(7:1)	y=4.8062+0.8967x	0.9993	1.6449(1.5679-1.7258)	1.8627	1.1324
苯醚菌酯:戊唑醇(5:1)	y=4.9002+0.8756x	0.9994	1.3001(1.2454-1.3571)	1.5283	1.1755
苯醚菌酯:戊唑醇(3:1)	y=4.9800+0.8280x	0.9994	1.0571(1.0153-1.1006)	1.1245	1.0638
苯醚菌酯:戊唑醇(1:1)	y=5.2767+0.8700x	0.9980	0.4808(0.4428-0.5220)	0.6273	1.3047
苯醚菌酯:戊唑醇(1:3)	y=5.3641+0.8434x	0.9936	0.3701(0.3143-0.4357)	0.4350	1.1754
苯醚菌酯:戊唑醇(1:5)	y=5.5487+0.7957x	0.9986	0.2044(0.1855-0.2251)	0.3946	1.9305
苯醚菌酯:戊唑醇(1:7)	y=5.5801+0.8191x	0.9984	0.1958(0.1762-0.2175)	0.3771	1.9259
苯醚菌酯:戊唑醇(1:9)	y=5.6084+0.8080x	0.9984	0.1766(0.1580-0.1975)	0.3674	2.0804
苯醚菌酯:戊唑醇(1:11)	y=5.5924+0.7998x	0.9990	0.1817(0.1666-0.1982)	0.3611	1.9873

处理	毒力回归方程	相关系数(r)	EC₅₀(Eob)及(95%FL)/(μg/mL)	EC₅₀(Eth)/(μg/mL)	增效系数(SR)
苯醚菌酯	y=4.5379+0.6294x	0.9979	5.4221(4.9936-5.8873)	-	-
戊唑醇	y=5.4885+1.0228x	0.9972	0.3329(0.3030-0.3658)	-	-
苯醚菌酯:戊唑醇(11:1)	y=4.6135+1.0048x	0.9840	2.4248(1.8399-3.1957)	2.3844	0.9833
苯醚菌酯:戊唑醇(9:1)	y=4.7117+0.9662x	0.9955	1.9879(1.7391-2.2722)	2.1442	1.0786
苯醚菌酯:戊唑醇(7:1)	y=4.8062+0.8967x	0.9993	1.6449(1.5679-1.7258)	1.8627	1.1324
苯醚菌酯:戊唑醇(5:1)	y=4.9002+0.8756x	0.9994	1.3001(1.2454-1.3571)	1.5283	1.1755
苯醚菌酯:戊唑醇(3:1)	y=4.9800+0.8280x	0.9994	1.0571(1.0153-1.1006)	1.1245	1.0638
苯醚菌酯:戊唑醇(1:1)	y=5.2767+0.8700x	0.9980	0.4808(0.4428-0.5220)	0.6273	1.3047
苯醚菌酯:戊唑醇(1:3)	y=5.3641+0.8434x	0.9936	0.3701(0.3143-0.4357)	0.4350	1.1754
苯醚菌酯:戊唑醇(1:5)	y=5.5487+0.7957x	0.9986	0.2044(0.1855-0.2251)	0.3946	1.9305
苯醚菌酯:戊唑醇(1:7)	y=5.5801+0.8191x	0.9984	0.1958(0.1762-0.2175)	0.3771	1.9259
苯醚菌酯:戊唑醇(1:9)	y=5.6084+0.8080x	0.9984	0.1766(0.1580-0.1975)	0.3674	2.0804
苯醚菌酯:戊唑醇(1:11)	y=5.5924+0.7998x	0.9990	0.1817(0.1666-0.1982)	0.3611	1.9873

药剂	施药剂量/(g/hm²)	赤霉病		DON
药剂	施药剂量/(g/hm²)	病情指数	病指防效/%	DON含量/(ng/g)	DON防效/%
37%苯醚菌酯·戊唑醇SC	225	1.08 c	85.16 c	831.56 c	82.82 b
37%苯醚菌酯·戊唑醇SC	300	0.88 c	87.91 bc	757.26 cd	84.36 b
37%苯醚菌酯·戊唑醇SC	450	0.52 c	92.86 a	508.91 e	89.49 a
10%苯醚菌酯SC	750	2.08 b	71.43 d	1719.06 b	64.49 c
430 g/L戊唑醇SC	375	0.70 c	90.38 ab	590.40 de	87.80 a
50%多菌灵WP	1500	2.35 b	67.72 d	1834.36 b	62.11 d
CK	-	7.28 a	-	4840.82 a	-

药剂	施药剂量/(g/hm²)	赤霉病		DON
药剂	施药剂量/(g/hm²)	病情指数	病指防效/%	DON含量/(ng/g)	DON防效/%
37%苯醚菌酯·戊唑醇SC	225	1.08 c	85.16 c	831.56 c	82.82 b
37%苯醚菌酯·戊唑醇SC	300	0.88 c	87.91 bc	757.26 cd	84.36 b
37%苯醚菌酯·戊唑醇SC	450	0.52 c	92.86 a	508.91 e	89.49 a
10%苯醚菌酯SC	750	2.08 b	71.43 d	1719.06 b	64.49 c
430 g/L戊唑醇SC	375	0.70 c	90.38 ab	590.40 de	87.80 a
50%多菌灵WP	1500	2.35 b	67.72 d	1834.36 b	62.11 d
CK	-	7.28 a	-	4840.82 a	-

药剂	施药剂量/(g/hm²)	药前病情指数	2次药后14 d		2次药后21 d
药剂	施药剂量/(g/hm²)	药前病情指数	病情指数	病指防效/%	病情指数	病指防效/%
37%苯醚菌酯·戊唑醇SC	225	0.52 a	2.44 cd	78.88 bc	5.44 c	71.78 d
37%苯醚菌酯·戊唑醇SC	300	0.48 a	1.65 de	84.53 ab	3.60 d	79.77 b
37%苯醚菌酯·戊唑醇SC	450	0.56 a	1.17 e	90.59 a	2.94 d	85.84 a
10%苯醚菌酯SC	750	0.51 a	2.95 bc	73.96 cd	6.73 b	64.40 e
430 g/L戊唑醇SC	375	0.49 a	2.02 d	81.44 ab	4.73 c	73.96 c
50%多菌灵WP	1500	0.48 a	3.52 b	66.99 d	7.41 b	58.36 f
CK	-	0.56 a	12.44 a	-	20.76 a	-