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首页> 外文期刊>Weed technology >Verification and Distribution of Propanil-Resistant Barnyardgrass (Echinochloa crus-galli) in Arkansas
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Verification and Distribution of Propanil-Resistant Barnyardgrass (Echinochloa crus-galli) in Arkansas

机译：在阿肯色州的耐丙酸Bar（Echinochloa crus-galli）的验证和分布

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摘要

Propanil-resistant barnyardgrass was reported in Poinsett County, AR, in 1990. Greenhouse studies were initiated to determine the distribution of propanil-resistant barnyardgrass in the state and to characterize the resistance. Barnyardgrass seeds were obtained in 1991 and 1992 from fields in 19 of the 38 rice producing counties in Arkansas where propanil treatment at recommended rates gave unsatisfactory barnyardgrass control. Barnyardgrass seedlings from the various sources were treated with propanil at 4.5 kg ai/ha and seedling injury response was compared to the response of seedlings collected from known resistant and susceptible barnyardgrass populations. Propanil-resistance of varying levels was confirmed in 115(16 counties) out of the 138 Arkansas barnyardgrass seed sources. Propanil I_(50) values (rate of herbicide required to provide 50% injury/control) were determined to be 14, 20, and 39 kg/ha for slightly, moderately, and highly resistant barnyardgrass, respectively. A resistance factor of 20x was found in the highly resistant barnyardgrass category. Development of resistance was highly correlated with crop rotations where rice was grown one out of two, or two out of three years.
机译：1990年，在AR的Poinsett县报道了抗丙醇的bar草。开始进行温室研究，以确定该州抗丙酸的bar草的分布并鉴定其抗药性。 n草种子是在1991年和1992年从阿肯色州38个水稻生产县中的19个县获得的，这些地区按推荐的比例进行了丙烷处理，bar草的控制效果不理想。将来自各种来源的n草幼苗以4.5 kg ai / ha的丙烷进行处理，并将幼苗伤害反应与从已知抗性和易感bar草种群中收集的幼苗的反应进行比较。在138个阿肯色州n草种子来源中的115个（16个县）中，丙酸的耐药性有所不同。对于轻度，中度和高抗性bar草，丙三醇I_（50）值（提供50％伤害/控制所需的除草剂比率）分别确定为14、20和39 kg / ha。在高抗性bar草类别中发现抗性因子是20倍。抗性的发展与作物轮作高度相关，在这种情况下，水稻每两年种植一次，或者三年种植两次。

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