New Zealand: New biocontrol released to control Tomato Potato Psyllid

A new biocontrol Tamarixia trioaze, a parasitoid wasp which destroys the Tomato Potato Psyllid (TPP) pest, has been released in Hawke’s Bay and Canterbury.

These initial releases are the start of a wider planned release and monitoring programme that is being supported with funding through the government’s Sustainable Farming Fund (SFF).


Tamarixia triozae about to parasitise a TPP nymph

The Tomato Potato Psyllid has caused enormous problems for the potato, tomato, capsicum and tamarillo growers in New Zealand since it was discovered here in 2006.

Since then, the industry has been waging a battle to control this insect pest. Tamarixia, a tiny wasp that lays its eggs on the psyllid, which then hatch and eat the psyllid, is a biological control option. Tamarixia is found in the USA and Mexico as a naturally occurring parasitoid of Tomato Potato Psyllid.


A healthy TPP nymph alongside a parasitized nymph (showing exit hole)

The Tamarixia were released onto African boxthorn - a TPP overwintering host, as there are currently no host crops such as potatoes or tomatoes in the ground.

The industry groups involved are now looking at ways of ensuring a supply of Tamarixia will be available for release by commercial growers this summer.

The application to release Tamarixia by Horticulture New Zealand's Vegetable and Research Innovation Board on behalf of industry groups including Potatoes New Zealand, Tomatoes NZ, Vegetables New Zealand, the NZ Tamarillo Growers Association and Heinz-Wattie’s NZ Ltd., was approved by the Environmental Protection Authority (EPA) in June 2016.

Source: TomatoesNZ

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