Back from the brink: how biocontrol saved St Helena’s national tree from extinction

The CABI Blog

Gumwoods of St Helena The gumwoods of St Helena are flourishing again after facing extinction

By Wayne Coles

At first sight the humble scale insect, Orthezia insignis doesn’t seem like it could pack much of a punch in a ‘fight’ against a range of native flora – but to make such an assumption would be very dangerous indeed.

In fact Orthezia insignis is a genuine invasive menace which in Hawaii, East Africa and South and Central America has, at times, wreaked havoc on numerous ornamental plants including citrus, coffee, olive, Jacaranda and Lantana.

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