Department of Agricultural Biology, Colorado State University, Fort Collins, CO 80523.
School of Plant and Environmental Sciences, Virginia Tech, Blacksburg, VA 24061.
Plant Dis. 2023 Sep;107(9):2769-2777. doi: 10.1094/PDIS-04-22-0863-RE. Epub 2023 Sep 1.
is a soilborne plasmodiophorid that causes powdery scab and root gall formation in potato. In this study, 18 cover crops suitable for use in dry, high-altitude potato production regions were assessed in potting mix trials to determine whether these cover crops altered population levels. Although appeared to invade roots of all plant species tested, the pathogen was unable to complete its life cycle on 11 of 18 cover crops based on postharvest qPCR and microscopy results. Buckwheat, legumes, and scarlet barley do not appear to support pathogen replication, but the pathogen may be able to complete its life cycle in some mustards. High variability occurred in the experiments and part of this may be due to the natural infestations of peat-based potting mix with . A tomato bioassay was used to confirm that commercial sources of peat-based potting mix were infested with . Dry heat and autoclaving were tested as sanitation methods and multiple rounds of autoclaving were required to reduce viable in potting mix. A second cover crop experiment with autoclaved potting mix was conducted and it confirmed that buckwheat, legumes, and barley do not support replication but that some brassica crops may be hosts of this pathogen. The results suggest that buckwheat, legumes, and barley pose the least risk as cover crops in infested fields and show that peat-based potting mix should not be used in seed potato production.
是一种土传粉虱，可导致马铃薯粉状痂和根瘤形成。在这项研究中，18 种适合在干旱、高海拔马铃薯种植区使用的覆盖作物在盆栽混合试验中进行了评估，以确定这些覆盖作物是否改变了种群水平。尽管 似乎入侵了所有测试植物物种的根部，但根据收获后 qPCR 和显微镜结果，该病原体无法在 18 种覆盖作物中的 11 种上完成其生命周期。荞麦、豆类和红高粱似乎不支持病原体复制，但该病原体可能能够在某些芥菜中完成其生命周期。实验中存在高度变异性，部分原因可能是基于泥炭的盆栽混合中 自然侵染。番茄生物测定用于确认商业来源的基于泥炭的盆栽混合中受到 的侵染。干热和高压灭菌被测试为消毒方法，需要多次高压灭菌才能减少盆栽混合中 的存活。进行了第二次带有高压灭菌盆栽混合的覆盖作物实验，结果证实荞麦、豆类和大麦不支持 复制，但一些十字花科作物可能是该病原体的宿主。结果表明，荞麦、豆类和大麦作为受侵染田地的覆盖作物风险最小，并表明泥炭基盆栽混合不应用于种薯生产。
