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Phytosanitary Situation of Maize streak virusin the Main Maize Production Zones of Cameroon

机译:喀麦隆主要玉米生产区玉米条纹病毒的植物检疫情况

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摘要

Maize streak caused by the Maize streak virus (MSV, genus Mastrevirus) is transmitted by Cicadulina spp., and is responsible for considerable maize yield losses in all maize production zones in Africa, including Cameroon. A survey was conducted in 3 agro-ecological zones (AEZ) of Cameroon (Sudano-Sahelian: zone I, Western Highlands: zone III and Bimodal Rainforest: zone V) between November 2017 and November 2019 to determine the status of streak disease in maize farms. The incidence and severity were determined in 90 maize fields, 30 fields per AEZ;the effect of lightning on the disease was also assessed using 15 fields under shade and 15 opened fields per AEZ. The highest streak disease incidence (60%) was found in AEZ I, whereas the lowest incidence was 10% in AEZV. The highest disease incidence and severity (80% and 4.5 respectively) were observed in maize fields under shade as compared to open fields (70% and 4.5 respectively). The phylogenetic analysis of MSV sequences from symptomatic plants indicated it as MSV-A strain identical to be previously reported to determine the virus diversity in relation to the other characterization isolates. This information is important for the development of control strategies to limit yield losses due to MSV.
机译:由玉米条纹病毒(MSV,Mastrevirus)引起的玉米条纹由Cicadulina SPP传播,并负责非洲的所有玉米生产区的大型玉米产量损失,包括喀麦隆。 2017年11月至2019年11月期间,在喀麦隆(Sudano-Sahelian:I,西部高地:4区),西部高地和双峰雨林:Zone v)中进行了一次调查。农场。该发病率和严重程度在90米玉米田地,每艾兹30个田地测定;使用遮阳阴影下的15个田地和15个打开的田地,还评估了雷击对疾病的影响。在AEZ I中发现了最高的条纹疾病发病率(60%),而在AEZV中最低的发病率为10%。与开放场(分别为70%和4.5)相比,在阴影下的玉米场中观察到最高的疾病发病率和严重程度(分别为80%和4.5)。来自症状植物的MSV序列的系统发育分析表明它作为MSV-A应变以前据报道,以确定与其他表征分离物相关的病毒分集。此信息对于制定控制策略对于限制由于MSV而限制屈服损失的重要性是重要的。

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