2022
DOI: 10.33494/nzjfs522022x224x
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Infection periods of Phytophthora pluvialis and Phytophthora kernoviae in relation to weather variables and season in Pinus radiata forests in New Zealand

Abstract: Background: Red needle cast caused by Phytophthora pluvialis Reeser, Sutton & E. Hansen, and less frequently P. kernoviae Brasier, Beales & S.A.Kirk, is an important foliar disease of Pinus radiata D.Don (radiata pine) in plantations throughout parts of New Zealand. Significant growth loss occurs following years when severe outbreaks occur. Aerial spraying with a copper-based fungicide has potential for disease control. Research is being carried out to optimise application timing, supported by compleme… Show more

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Cited by 4 publications
(7 citation statements)
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“…Both species were detected at the trial sites, and, at times, P. kernoviae seemed to be more abundant. This is a similar pattern to that seen in the same forest by Hood et al (2022). Phytophthora kernoviae has a long history in the forest where the trials took place, having been first isolated from there in the 1950s (McAlonan 1970;Ramsfield et al 2007).…”
Section: Discussionsupporting
confidence: 74%
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“…Both species were detected at the trial sites, and, at times, P. kernoviae seemed to be more abundant. This is a similar pattern to that seen in the same forest by Hood et al (2022). Phytophthora kernoviae has a long history in the forest where the trials took place, having been first isolated from there in the 1950s (McAlonan 1970;Ramsfield et al 2007).…”
Section: Discussionsupporting
confidence: 74%
“…Inoculum is predominantly detected in the coolest and wettest months of the year, with a peak between June and August, and little detection in the warmer and drier summer months (Fraser et al 2020). A similar pattern has also been seen for infection (Hood et al 2022). It has been suggested therefore that copper applications in autumn (March-May), which protect needles for the first three months of the RNC season, may be most effective (Fraser et al 2020;Hood et al 2022;Rolando et al 2019) with potential benefits from a second application three months later.…”
Section: Introductionsupporting
confidence: 59%
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