甘肃省黄芪霜霉病发病规律及防治经济阈值研究

doi:10.11686/cyxb2015066

草业学报 ›› 2015, Vol. 24 ›› Issue (9): 113-120.DOI: 10.11686/cyxb2015066

甘肃省黄芪霜霉病发病规律及防治经济阈值研究

陈泰祥^1,2,杨小利²,陈秀蓉^2,*,李春杰¹,王涵琦²,王艳^2,3

1. 兰州大学草地农业科技学院,农业部草地农业生态系统重点开放实验室,甘肃兰州 730020;
2.甘肃农业大学草业学院,草业生态系统教育部重点实验室, 甘肃省草业工程实验室, 中-美草地畜牧业可持续发展研究中心,甘肃兰州 730070;
3.甘肃中医学院药学系,甘肃兰州 730000

收稿日期:2015-01-29 出版日期:2015-09-20 发布日期:2015-09-20
通讯作者: E-mail:chenxiurong@gsau.edu.cn
作者简介:陈泰祥(1987-),男,甘肃陇西人,在读博士。E-mail:chentxky@163.com
基金资助:
甘肃省中药材产业科技攻关项目(GYC11-01)资助

A study of outbreak occurrence and economic threshold of downy mildew on Astragalus membranaceus

CHEN Tai-Xiang^{1, 2}, YANG Xiao-Li², CHEN Xiu-Rong^{2, *}, Li Chun-Jie¹, WANG Han-Qi², WANG Yan^{2, 3}

1.State Key Laboratory of Grassland Argo-Ecosystem, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou 730020, China;
2.College of Pratacultural Science, Gansu Agricultural University, Key Laboratory of Grassland Ecosystem of Education Ministry, Pratacultural Engineering Laboratory of Gansu Province, Sino-U.S. Centers for Grazingland Ecosystem Sustainability, Lanzhou 730070, China;
3.Gansu College of Traditional Chinese Medicine, Lanzhou 730000, China

Received:2015-01-29 Online:2015-09-20 Published:2015-09-20

摘要/Abstract

摘要： 为明确甘肃省黄芪霜霉病的发病规律、防治药剂、经济危害允许水平和防治经济阈值,采用田间定点定期系统调查的方法,对该病害的发病进程以及影响发病的气候因素等进行了研究,采用模型拟合的方法研究了霜霉病病情指数与黄芪产量损失率的最佳拟合模型,选用6种杀菌剂进行了田间药效试验。结果表明: 黄芪霜霉病在5月份显症,8月初至9月中旬为盛发期,一直延续到收获。黄芪霜霉病的病情指数随晚间平均相对湿度和病情基数的增加而增加,病情指数增长率随着白天平均温度的增加而增加。4种模型拟合结果表明,对数函数(y=33.81lnx-97.15)是拟合霜霉病病情指数(x)与黄芪产量损失率(y)的最好模型;选用60%百泰(5%吡唑醚菌酯·55%代森联)WG 800倍液进行霜霉病的防治时,经济危害允许水平和经济阈值分别为5.65%和17.73。药剂试验结果表明,52.5%抑快净WG 1500倍液、60%百泰WG 1000倍液是防治黄芪霜霉病良好的药剂;72%霜脲氰·锰锌WP 400倍液、75%百菌清WP 350倍液以及65%代森锌WP 200倍液对黄芪霜霉病亦有较好的防效,可选择在生产中使用。

Abstract: To determine outbreak occurrence, economic infection level and economic threshold of downy mildew (Peronospora astragalina) on Astragalus membranaceus in Gansu Province, the disease dynamics and the correlation between disease and weather conditions were analysed based on data from fixed on-site field investigation and systematic field surveys. A curve fitting technique was used to define the relationship between disease index and yield loss for A. membranaceus. Fungicides to control the disease were tested. It was found that the peak period for downy mildew occurrence was from early August to mid-September, the disease risk index was low after mid-September. Statistical analysis revealed that the disease risk index increased gradually with the increasing mean night relative humidity and disease cardinality. The logarithmic regression model (y=33.81 ln x-97.15) adequately described the relationship between disease index (x) and yield loss (y) of A. membranaceus. The economic injury levels for downy mildew on A. membranaceus treated with 5% Pyraclostrobin·55% Metiram diluted 800 times were 5.65%, and the economic threshold was about 17.73. Sensitivity testing for fungicides showed that 22.5% Famoxadone·30% Cymoxanil diluted 1500 times, 5% Pyraclostrobin·55% Metiram diluted 1000 times, 8% Cymoxanil·64% Mancozeb diluted 400 times, 75% Chlorothalonil diluted 350 times and 65% Zineb diluted 500 times could be used in rotation to control powdery mildew on A. membranaceus.

陈泰祥,杨小利,陈秀蓉,李春杰,王涵琦,王艳. 甘肃省黄芪霜霉病发病规律及防治经济阈值研究[J]. 草业学报, 2015, 24(9): 113-120.

CHEN Tai-Xiang, YANG Xiao-Li, CHEN Xiu-Rong, Li Chun-Jie, WANG Han-Qi, WANG Yan. A study of outbreak occurrence and economic threshold of downy mildew on Astragalus membranaceus[J]. Acta Prataculturae Sinica, 2015, 24(9): 113-120.

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甘肃省黄芪霜霉病发病规律及防治经济阈值研究

A study of outbreak occurrence and economic threshold of downy mildew on Astragalus membranaceus

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