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Pathogen loads of Phytophthora pluvialis and Nothophaeocryptopus gaeumannii populations co-existing within exotic plantations of New Zealand in contrast to Douglas-fir’s endemic range in the US Pacific Northwest

Abstract : The emergence of Phytophthora pluvialis as a foliar pathogen of Douglas-fir in New Zealand (NZ) and the US Pacific Northwest (PNW) has raised questions about its interaction with the widespread Swiss needle cast (SNC) disease. During spring 2017, we repeatedly sampled 30 trees along an environmental gradient in each region, and 292 additional trees in a longitudinal transect, to assess the P. pluvialis epidemic and the association between P. pluvialis and Nothophaeocryptopus gaeumannii, causal agent of SNC. Both pathogens were consistently more abundant in the host’s exotic environment of NZ, compared to the PNW. In both regions, the two pathogens coexist at different spatial scales ranging from region to needles. The relative abundance of both pathogens was negatively correlated in the PNW, where both pathogens have presumably coexisted for a longer period of time. Our findings confirm the co-existence of P. pluvialis and N. gaeumannii as foliar pathogens of Douglas-fir and suggest a within-site spatial variation in the PNW.
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https://hal.univ-lorraine.fr/hal-03220955
Contributor : Mireia Gomez Gallego <>
Submitted on : Friday, May 7, 2021 - 3:49:05 PM
Last modification on : Thursday, May 13, 2021 - 8:24:02 PM

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  • HAL Id : hal-03220955, version 1

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Mireia Gómez-Gallego, Jared M. Leboldus, Martin K.-F. Bader, Everett Hansen, Lloyd Donaldson, et al.. Pathogen loads of Phytophthora pluvialis and Nothophaeocryptopus gaeumannii populations co-existing within exotic plantations of New Zealand in contrast to Douglas-fir’s endemic range in the US Pacific Northwest. 9th Meeting of the IUFRO Working Party 7.02.09: Phytophthora in Forests and Natural Ecosystems, Oct 2019, La Maddalena, Italy. ⟨hal-03220955⟩

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