The rat population in a piece of pristine bush has exploded thanks to a plethora of beech tree seeds, forcing the Department of Conservation to make a 1080 drop.

But the glut of food means it can be difficult to get rats to eat the poison.

The Department of Conservation is concerned after a higher percentage of rats than expected have survived the first 1080 drops intended to battle this year's "mega mast".
​
This year's build-up of the rat population in New Zealand forests can be attributed to unusually high seed production, called a mast, experts have said.

"Wake up in paradise" is New Zealand's proud boast. It has a rightful swagger: its turquoise glacial lakes are ringed by untouched mountain ranges, while historic Māori sites speak of a people at one with the natural world.
​
But there are stains on the environment. In this corner of the South Pacific, waterways are increasingly polluted and, from the suburbs to the alpine peaks, an untold army of feral pests is running amok, putting about 80% of New Zealand's bird species at the risk of extinction.

Official maps released today have revealed the vast swathe of New Zealand wilderness under threat from a plague-fuelling "mega mast" - but officials say response plans can't be scaled up.
​
Forest & Bird is warning a nationwide rat plague is only about to get worse, and has pleaded with the Government and councils to increase their 1080 rat control programmes, before a stoat plague comes next.

An aerial drop of 1080 is set for a large area of the Kahurangi National Park to control a booming rat population.
​
This year's beech mast, or heavy seed production, is expected to lead to a heavy breeding season for rats taking advantage of the abundant food source.

A newly long-term study reveals kiwi chicks located in a North Island Forest are more likely to survive following the aerial 1080 operation, where the poison is dropped, to control pests.

​ Conservation managers are bracing for the biggest seeding event in New Zealand's forests for more than 40 years. Forest seeding, or masting, provides a bonanza of food for native species but also fuels rodent and stoat pests. The Department of Conservation (DoC) is now planning its biggest ever predator control Program, at a cost of $38 million. It will target rats, stoats and possums over about one million hectares or 12 per cent of conservation land. Priority sites include Kahurangi, Abel Tasman, Arthur's Pass, Westland, Mt Aspiring and Fiordland National parks, the Catlins and Whirinaki. More than 66,000 ha will be covered with trapping – and the rest with aerial 1080 poison drops. Science reporter Jamie Morton principal science advisor Dr. Graeme Elliott about the challenge.

The Department of Conservation (DoC) has significantly increased its spending on finding alternatives to 1080.
​
Documents obtained by Newshub show since 2011, the trend in spending has jumped from $1.06 million a year to $3.55 million planned spend in 2018/19.

In an unexpected result, scientists encountered more deer in South Westland forest blocks after 1080 drops than before the drops.
​
They also encountered and saw the same numbers of deer in 1080 drop zones as they did in zones where 1080 was not dropped.

Native birds are thriving in Auckland's Hunua Ranges following a 1080 drop that has decimated the rat and possum population, Auckland Council says.
​
The aerial application of 1080 across 22,000 hectares of forest in late 2018 was conducted by the council in partnership with the Department of Conservation.​