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Invasive Phytophthora 
 

Ranking (risks vary depending on species) based on the KVH risk matrix
Likelihood of entry
Likelihood of establishment Production impacts Market access impacts
Medium Medium High Very low

 

Phytophthora is present around the world, including New Zealand, in a
wide range of hosts. There are over 100 known species of Phytophthora,
with thoughts there could be up to 500 more yet to be identified.

There are many reports of different Phytophthora damaging kiwifruit vines in
different regions globally, such as P.drechsleri, which has caused significant impacts
to the kiwifruit industry in Korea.

It is considered highly likely that under certain conditions (i.e. wet soils) kiwifruit would be susceptible to several Phytophthora species. Predicting which species will impact which cultivars, and under what conditions, is difficult if not impossible to predict. Because of this, KVH is undertaking readiness planning and research for invasive Phytophthora species as a whole, as opposed to focusing on one specific species.

The biosecurity threat of Phytophthora to the New Zealand kiwifruit industry is largely unknown. It could come from the introduction of a new Phytophthora species, or from a species already here that may not yet have been exposed to kiwifruit.

Management practices, cultivar susceptibility and the environment may also play key roles in any future outbreaks. Phytophthora are Oomycetes (or water moulds), so wet, soggy soils are an ideal environment for them to thrive. As such, low-lying land, poorly drained orchards and additional irrigation are more susceptible to infection.

Symptoms

One of the difficulties with detecting Phytophthora disease symptoms is that they are variable and often are not distinct from those resulting from other plant pathogens (such as Armillaria root rot which can sometimes be misdiagnosed as Phytophthora root rot).

The other difficulty with Phytophthora symptom detection arises from asymptomatic plants, where the pathogen can lay dormant for long periods until conditions change and symptoms are expressed. There are many types of symptoms associated with Phytophthora species that may occur singly or in combination.

Phytophthora usually infects kiwifruit vines from root wounds or the root tips early in spring. During the warmer summer months, vines may rapidly decline or alternatively show gradual decline in productivity over several seasons. Symptoms include reduced shoot growth; small, chlorotic leaves; and an open canopy. Vines with the graft union below ground level or mechanically wounded trees are easily infected. Infected root and root crowns commonly show a red brown rot that is easily observed when cutting into the outer layer of tissue. Generally, there is observable margin where healthy, white tissue meets infected, discoloured tissue. Infected roots become dark and feeder roots are often black, decayed and few in number (see image below).

Research

KVH, Zespri and Plant & Food Research are working together on a survey of Phytophthora pathogens in kiwifruit orchards throughout New Zealand. This project will support New Zealand’s biosecurity by better understanding our current baseline of Phytophthora species associated with kiwifruit. Sampling rounds will be completed in autumn and spring over two years (2020/21).


Reference material

  • Potential impacts on kiwifruit and kiwiberry - a literature review presenting detailed information on the potential threat posed by Phytophthora, and three case studies highlighting principles of spread, management and control.

Kiwifruit Vine Health

25 Miro St
Mount Maunganui
Tauranga 3116

Tel:  0800 665 825
Fax: 07 574 7591

Email: info@kvh.org.nz