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A comparison of two pathosystems: Downy mildew on Spinacia oleracea and on Chenopodium album

Een vergelijking van twee pathosystemen: Valse meeldauw op Spinacia oleracea en op Chenopodium album

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Abstract

The development of downy mildew (Peronospora farinosa) on a cultivated spinach crop (Spinacia oleracea) was compared to that on lambsquarters (Chenopodium album), a naturally occurring weed. Experiments were carried out on small spinach plots, in which epidemics could develop from point sources (PS) or area sources (AS).

Two lambsquarter populations were studied, in which downy mildew epidemics arose from oospore infections. The downy mildew epidemics, on spinach and lambtquarters, were related to the environmental factors: temperature, vapour pressure deficit (VPD) and rainfall. It is concluded that the two different formae speciales ofP. farinosa, one on spinach and one on lambsquarters, react in the same way to weather changes. The epidemiological patterns were almost similar.

Samenvatting

De ontwikkeling van valse meeldauw (Peronospora farinosa) op het cultuurgewas spinazie (Spinacia oleracea) werd vergeleken met die op het zich natuurlijk ontwikkelende onkruid melganzevoet (Chenopodium album). Daarvoor werden experimenten uitgevoerd op spinazieperceeltjes, waarop in enkele gevallen puntbroninfecties (PS), en in andere gevallen oppervlaktebrondinfecties (AS) waren aangebracht. Er werd gevarieerd in inoculatietijdstip.

Bij melganzevoet werden twee populaties bestudeerd, waarin de ziekte via oösporeinfectie op natuurlijke wijze was ontstaan.

Het geheel werd in verband gebracht met de omgevingsfactoren: temperatuur, dampdruk-deficiet (VPD) en regenval. Geconcludeerd kan worden, dat deP. farinosa formae speciales zowel op spinazie als op melganzevoet op gelijke wijze reageerden op veranderingen in het weer. Het verloop van de epidemieeën was sterk vergelijkbaar.

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Author notes

  1. E. G. A. Linders

    Present address: BEJO Zaden, P.O. Box 9, 1722 ZG, Noord-Scharwoude, the Netherlands

Authors and Affiliations

  1. Laboratory of Phytopathology, Agricultural University, Binnenhaven 9, 6709 PD, Wageningen, the Netherlands

    H. D. Frinking & E. G. A. Linders

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  1. H. D. Frinking
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  2. E. G. A. Linders
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Frinking, H.D., Linders, E.G.A. A comparison of two pathosystems: Downy mildew on Spinacia oleracea and on Chenopodium album. Netherlands Journal of Plant Pathology 92, 97–106 (1986). https://doi.org/10.1007/BF02000329

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  • DOI: https://doi.org/10.1007/BF02000329

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