• Conifer with dieback

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Dieback (Phytopthera) is caused by fungal disease that creates root rot and prevents plants thriving.


Dieback (Phytopthera) causes root rot in susceptible plants, thereby limiting or stopping the uptake of water and nutrients. Symptoms include yellowing of foliage, loss of leaves, canopy thinning and dead branches.

The pathogen is able to survive within plant roots during the dry soil conditions commonly experienced during the summer months.

Kauri dieback is a phytopthera disease that is affecting and killing kauri trees in New Zealand and great efforts are being made to find how this disease is spread.

Buxus dieback is a disease of buxus (box) hedging plants and is spreading rapidly in parts of the North Island of New Zealand. It is not caused by phytopthera and is better described as buxus blight.


To control root rotting diseases & dieback on fruit trees, ornamentals, shrubs and roses, spray both foliage and soil with Kiwicare PLANThealth Buxus Blight Buster (or Root Protect Aliette). They penetrate rapidly & has a long residual action.

To control buxus die back, remove and burn dead branches and spray with PLANThealth Rose Force ot Thiram Fungus Control as directed on pack.

Did you know

Phytophthora fungi are pathogenic species that can cause die back in many different plants and are pests of major economic importance. It was one of this group of fungi that caused the great potato famine in Ireland. It is also a Phytopthera that is causing Kauri dieback and damaging and killing many of the iconic trees of the North Island of New Zealand.

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