A ''double whammy'' of guava moth and a new strain of fungus is devastating Kerikeri feijoa orchards with some growers losing 95 per cent of their crop.

Feijoa Growers Association president Roger Matthews said the anthracnose fungus usually affected only ripe fruit.

However, a more aggressive strain was now affecting Kerikeri orchards.

The new form attacked unripe fruit, even when they were just 5-6mm long, and caused fruit to drop before it was ripe.

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In some cases the fungus was also causing die-back of branches and whole trees.

A feijoa affected by anthracnose fungus, which is destroying the crop in Northland. Photo / Stuart Duff
A feijoa affected by anthracnose fungus, which is destroying the crop in Northland. Photo / Stuart Duff

''Some growers in Kerikeri are getting 95 per cent fruit drop, it's

"I'm bloody worried"