Distribution of Verticillium dahliae through watering systems in widely irrigated olive growing areas in Andalucia (southern Spain)

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• 作者：S. García-Cabello (1)
  M. Pérez-Rodríguez (1)
  M. A. Blanco-López (1)
  F. J. López-Escudero (1) ag2loesj@uco.es
• 关键词：Dispersal – Guadalquivir Valley – Irrigation pools – Microsclerotia – Olea europaea – Pumping stations – Sand filters – Verticillium wilt of olive
• 刊名：European Journal of Plant Pathology
• 出版年：2012
• 出版时间：August 2012
• 年：2012
• 卷：133
• 期：4
• 页码：877-885
• 全文大小：156.6 KB
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• 作者单位：1. Departamento de Agronomía, Universidad de Córdoba, Spain, Campus Universitario de Rabanales, Edificio Celestino Mutis (C4), 14071 Córdoba, Spain
• ISSN：1573-8469

文摘

Verticillium dahliae Kleb. causes Verticillium wilts in many herbaceous and woody species. Many hosts of the pathogen are commonly cultivated in Andalucía (southern Spain), particularly major crops such as cotton, vegetables, almond, peach and, particularly, olive, in which the fungus causes Verticillium wilt of olive. Infective structures of the pathogen (microsclerotia), produced in the late phases of the infection cycle in senescent tissues of the infected plants, can be spread over short or long distances by a number of dispersal methods. Irrigation water is one of the factors implicated in this spread of V. dahliae. Indeed, increasing irrigation dosages in crops or an inadequate irrigation schedule have been identified as cultural practices favouring Verticillium wilt onset and severity in olive and other hosts. Most of the cultivated areas in the Guadalquivir Valley of Andalucía are irrigated by pumping stations using modern infrastructures that supply water to thousands of hectares of farm land, which are usually associated with irrigation communities. This study demonstrates that the pathogen survives in the sediment and particles suspended in water used for irrigation in different facilities of an irrigation community, that were involved in distributing water (main canal and reception tank of a investigated pumping station, irrigation pools and sand from filters). Thus microsclerotia moves from the pumping station to individual plots (olive and cotton cultivated farm) as viable microsclerotia, free or embedded in soil particles and plant debris, suspended in the irrigation water, or deposited in the sludge in piping systems or water storage ponds. We have detected amounts of inoculum in the solid pellet samples in these facilities that ranged from 2.7 to 6.7 microsclerotia per gram. Besides this, water from drippers in cultivated plots released into the soil a variable amount of infective propagules of the pathogen over time that accounted for 3.75 microsclerotia/m3 in some of the recording times. Therefore, irrigation water becomes an important source of inoculum that is very effectively involved in medium and long-distance spread of the pathogen.