Berbegal M, Ortega A, García-Jiménez J, Armengol J
Instituto Agroforestal Mediterráneo, Universidad Politécnica de Valencia, Camino de Vera s/n, 46022 Valencia, Spain.
Universidad Miguel Hernández, Escuela Politécnica Superior de Orihuela, Dpto. de Producción Vegetal y Microbiología, Ctra. Beniel km 3.2, 03312 Orihuela, Alicante, Spain.
Plant Dis. 2007 Sep;91(9):1131-1136. doi: 10.1094/PDIS-91-9-1131.
The relationship between inoculum density of Verticillium dahliae in soil and disease development was studied in 10 commercial artichoke fields. Inoculum density of V. dahliae varied between 2.2 and 34.2 microsclerotia (ms) g of soil near planting. Artichoke plants were monitored for disease at the beginning and the end of each growing season. There was a significant correlation, which was best described by negative exponential models, between inoculum density and disease incidence, symptom severity, and recovery of the pathogen from the plants. Inoculum densities ranging from 5 to 9 ms g of soil were associated with a mean percentage of infected plants of about 50%. Additionally, three fields were monitored in two consecutive growing seasons to evaluate the population dynamics of V. dahliae microsclerotia in soil and disease development. Numbers of microsclerotia per gram of soil decreased significantly by the end of the first growing season but slightly increased at the end of the second growing season. In these fields, symptom severity was greatest during the second growing season when high percentages of infected plants also were recorded.
在10个商业化种植的洋蓟田中研究了土壤中大丽轮枝菌接种密度与病害发展之间的关系。种植前土壤中大丽轮枝菌的接种密度在2.2至34.2个微菌核/克土壤之间变化。在每个生长季节开始和结束时监测洋蓟植株的病害情况。接种密度与发病率、症状严重程度以及从植株中分离出的病原菌数量之间存在显著相关性，用负指数模型能最好地描述这种相关性。土壤接种密度在5至9个微菌核/克之间时，感染植株的平均百分比约为50%。此外，连续两个生长季节对3个田块进行监测，以评估土壤中大丽轮枝菌微菌核的种群动态和病害发展情况。在第一个生长季节结束时，每克土壤中的微菌核数量显著减少，但在第二个生长季节结束时略有增加。在这些田块中，症状严重程度在第二个生长季节最为严重，此时也记录到了高比例的感染植株。
