10%乙霉威·腐霉利微粉剂的研制及其 对黄瓜棒孢叶斑病的防治效果

doi:10.3864/j.issn.0578-1752.2019.06.005

Abstract

Abstract:

【Objective】 The objective of this study is to obtain the optimal mixing ratio of diethofencarb and procymidone, which had high inhibitory activity against Corynespora cassiicola, the micropowder was prepared and its control efficacy on cucumber leaf spot was determined in the field. 【Method】 The inhibitory activity of the mixtures at different mixing ratios to C. cassiicola was determined by mycelial growth rate method. The synergistic effect was evaluated according to the Wadley formula and the best synergism combination was defined. Through single factor test, orthogonal test, the carrier, additives and optimal ratio were screened, the best formula was determined and then micropowder was processed by using air jet mill. The control efficacy of micropowder on cucumber leaf spot was determined. 【Result】 When the mass ratio of diethofencarb and procymidone was 1﹕1 and 1﹕4, the virulence synergistic effect against C. cassiicola strains HG09112606, FQ07091401 and HG11011509 was observed, with the synergistic ratios of 3.19, 2.53, 1.68; 1.99, 1.77, 1.98, respectively. Among which, the ratio of 1﹕1 had a significant synergistic effect. Active ingredient diethofencarb and procymidone account for 10%, dispersant NNO accounts for 3%, surfactant K12 accounts for 3%, stabilizer polyoxyethylene alkyl ether accounts for 1%, carrier carbon-white is 15% and diatomite make up to 100%. The results showed that the above formulation had excellent characteristics, and the particle size is 6.18 μm, the dispersion index is 95.18%, the planktonic index is 86.26, the water content is 1.24%, the slope angle is 67°, and the thermal storage decomposition rate is 4.12%. All above test results are in accordance with standard. In the pot experiment, the control efficacy of 10% diethofencarb and procymidone micropowder on the cucumber leaf spot by powder injection method was 89.82% when the dosage was 100 g a.i./hm ², which was significantly higher than that of the control agent 35% difenoconazole·prochloraz emulsion in water (EW) and 43% fluopyram·trifloxystrobin suspension concentrate (SC) agent spray at the recommended dosage. In the field test, the control efficacy of 10% diethofencarb and procymidone micropowder on the cucumber leaf spot by powder injection method was 84.39% when the dosage was 100 g a.i./hm ², which had no significant difference with that of spray with 35% difenoconazole·prochloraz EW in the amount of 300 g a.i./hm ², 43% fluopyram·trifloxystrobin SC in the amount of 90 g a.i./hm ². 【Conclusion】Diethofencarb and procymidone used in combinations had different degrees of synergistic interaction against cucumber Corynespora leaf spot. The 10% diethofencarb·procymidone micropowder prepared according to the selected formula has the advantages of small particle size, high dispersion index and planktonic index, and storage stability. It has a broad application prospect in the control of cucumber Corynespora leaf spot.

Key words: Corynespora cassiicola, cucumber Corynespora leaf spot, micropowder, diethofencarb, procymidone, control efficacy

CHUAI HongYun,SHI YanXia,CHAI ALi,YANG Jie,XIE XueWen,LI BaoJu. Development of 10% Diethofencarb·Procymidone Micropowder and Its Control Efficacy to Cucumber Corynespora Leaf Spot[J].Scientia Agricultura Sinica, 2019, 52(6): 1009-1020.

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References 31

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处理Treatment	分散指数Dispersion index (%)	浮游性指数Planktonic index	坡度角Slope angle (°)
凹凸棒土Attapulgite	85.13±0.04b	68.55±0.78b	76.00
硅藻土Diatomite	85.85±0.05b	78.11±2.07a	69.00
白炭黑Carbon-white	91.16±0.04a	60.67±0.88c	67.00
煅烧高岭土Kaolin	90.23±0.04a	61.88±0.98c	71.00
膨润土Bentonite	90.76±0.05a	71.88±0.98b	73.00
滑石粉Talc	87.08±0.06b	53.22±1.63d	69.00

序号 Number		因素Factor				分散指数 Dispersion index (%)	浮游性指数 Planktonic index	坡度角 Slope angle (°)
序号 Number		载体 Carrier (%)	分散剂 Dispersant (%)	表面活性剂 Surfactant (%)	稳定剂 Stabilizer (%)	分散指数 Dispersion index (%)	浮游性指数 Planktonic index	坡度角 Slope angle (°)
1		15.00	2.00	2.00	0.50	93.56±0.15b	83.17±0.27a	68.00
2		15.00	3.00	3.00	1.00	95.18±0.34a	86.26±0.37a	67.00
3		15.00	4.00	4.00	1.50	92.47±1.23b	83.18±1.16a	67.00
4		20.00	2.00	3.00	1.50	81.26±1.26d	80.16±0.94b	74.00
5		20.00	3.00	4.00	0.50	83.39±0.79c	79.45±1.26b	70.00
6		20.00	4.00	2.00	1.00	80.17±0.87d	78.16±0.36b	76.00
7		25.00	2.00	4.00	1.00	78.56±0.60e	78.12±0.95b	79.00
8		25.00	3.00	2.00	1.50	80.17±1.15d	75.36±1.56c	77.00
9		25.00	4.00	3.00	0.50	75.25±0.42f	75.27±0.18c	75.00
分散指数Dispersion index	K1	281.21	253.38	253.90	252.20
	K2	244.82	258.74	251.69	253.91
	K3	233.98	247.89	254.42	253.90
	k1	93.74	84.46	84.63	84.07
	k2	81.61	86.25	83.90	84.64
	k3	77.99	82.63	84.81	84.63
	极差R	15.74	3.62	0.91	0.57
浮游性指数 Planktonic index	K1	252.61	241.45	236.69	237.89
	K2	237.77	241.07	241.69	242.54
	K3	228.75	236.61	240.75	238.70
	k1	84.20	80.48	78.90	79.30
	k2	79.26	80.36	80.56	80.85
	k3	76.25	78.87	80.25	79.57
	极差R	7.95	1.61	1.67	1.55
坡度角 Slope angle	K1	202.00	221.00	221.00	213.00
	K2	220.00	214.00	216.00	222.00
	K3	231.00	218.00	216.00	218.00
	k1	67.33	73.67	73.67	71.00
	k2	73.33	71.33	72.00	74.00
	k3	77.00	72.67	72.00	72.67
	极差R	9.67	2.33	1.67	3.00

样品 Sample	名称 Name	保留时间 Keep time (min)	浓度 Concentration (μg·mL^-1)	峰面积 Peak area	热贮分解率 Thermal storage decomposition rate (%)
标样98.5%腐霉利和95%乙霉威 Standard 98.5% procymidone· 95% diethofencarb	乙霉威Diethofencarb	18.07	50.00	57666.00	—
	腐霉利Procymidone	19.14	50.00	36991.00	—
热贮前10%乙霉威·腐霉利微粉剂 Before thermal storage 10% diethofencarb· procymidone micropowder	乙霉威Diethofencarb	18.07	45.38	52167.00	—
	腐霉利Procymidone	19.14	46.76	127708.00	—
热贮后10%乙霉威·腐霉利微粉剂 After thermal storage 10% diethofencarb· procymidone micropowder	乙霉威Diethofencarb	18.07	42.10	49756.00	4.12
	腐霉利Procymidone	19.14	46.28	129915.00	4.12

性能指标 Performance index	微粉剂标准 Micropowder standard	测定结果 Determination result
有效成分Active ingredient (%)	—	10.00
细度Fineness (μm)	≤10.00	6.18
含水率Water content (%)	<1.50	1.24
分散指数 Dispersion index (%)	>20.00	95.18
浮游性指数Planktonic index	>85.00	86.26
坡度角 Slope angle (°)	65.00-75.00	67.00
分解率Decomposition rate (%)	<5.00	4.12

处理 Treatment	使用剂量 Dosage (g a.i./hm²)	施药方式 Processing method	病情指数 Disease index	防治效果 Control efficacy (%)
10%乙霉威·腐霉利微粉剂 10% diethofencarb·procymidone DL	100	喷粉Powder injection	6.50	89.82±0.73a
10%乙霉威·腐霉利微粉剂 10% diethofencarb·procymidone DL	150	喷粉Powder injection	5.76	90.99±0.32a
10%乙霉威·腐霉利微粉剂 10% diethofencarb·procymidone DL	100	喷雾Spray	12.60	80.27±0.29c
10%乙霉威·腐霉利微粉剂 10% diethofencarb·procymidone DL	150	喷雾Spray	7.7	87.95±0.56b
10%乙霉威·腐霉利可湿性粉剂 10% diethofencarb·procymidone WP	100	喷雾Spray	13.68	78.58±1.12c
10%乙霉威·腐霉利可湿性粉剂 10% diethofencarb·procymidone WP	150	喷雾Spray	9.69	84.83±1.72d
35%苯甲·咪鲜胺水乳剂 35% difenoconazole·prochloraz EW	300	喷雾Spray	8.56	86.60±1.15b
43%氟菌·肟菌酯悬浮剂 43% fluopyram·trifloxystrobin SC	90	喷雾Spray	9.33	85.39±1.46d
CK	—	—	63.87	—

Development of 10% Diethofencarb·Procymidone Micropowder and Its Control Efficacy to Cucumber Corynespora Leaf Spot

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