A multi-million pound oyster farm and hotel has burned down after bungling workers sprayed the entire pier with flammable mosquito spray.

Sinmana Farmstay, a floating sea resort which allowed guests to catch the molluscs, was expecting a big tour group today.

Ahead of their arrival workers sprayed the stilted structure with a thick fog of the repellent, reportedly a mixture of oil, diesel and gas.

A multi-million pound oyster farm and hotel has burned down after bungling workers sprayed the entire pier with flammable mosquito spray

Although it is currently unclear how, a spark ignited on the first floor and engulfed the artificial grass, causing the blaze to spread through the building off the coast of Surat Thani, southern Thailand at 5pm yesterday evening.

Rescue crews arrived by boat and for several hours battled the inferno, which caused 20 million baht (620,000USD) in damage.

Owner Somchai Sinma said: 'Workers were spraying mosquito spray because a big tour group was coming today.

Sinmana Farmstay, a floating sea resort which allowed guests to catch the molluscs, was expecting a big tour group today

Ahead of their arrival workers sprayed the stilted structure with a thick fog of the repellent, reportedly a mixture of oil, diesel and gas

Although it is currently unclear how, a spark ignited on the first floor and engulfed the artificial grass, causing the blaze to spread through the building off the coast of Surat Thani, southern Thailand at 5pm yesterday evening

'A spark ignited the spray and it quickly spread. They couldn't put out the flames and they spread very quickly on the artificial grass.'

The 200 square metre farm and hotel allowed guests to learn about oysters, catch them and eat them in the Bandon Bay.

Nobody was injured in the incident. Somchai said he would now begin trying to repair the building.

Owner Somchai Sinma said: 'Workers were spraying mosquito spray because a big tour group was coming today