Only 12 tons of oranges were destroyed and less than 10 percent of the trees were damaged by fruit flies in Guangyuan Sichuan province the provincial agriculture department said on Tuesday.

It was discounting reports that 10000 tons of oranges had to be destroyed.

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The news caused concern among some consumers in Chongqing and Taiyuan Shanxi province.

Both cities import oranges from Sichuan.

The report of fruit flies can do serious damage" Mou Jinyi chief agronomist of the agriculture department said at a press conference in Chengdu.

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He said fruit flies of the tetradacu species had been discovered in 11 towns in Wangcang a county under the administration of Guangyuan.

The agriculture department said only 68000 trees accounting for 8.9 per cent of the county\'s total had been infected and the situation was now under control.

Postings on the Internet said the sudden appearance of tetradacu flies in Wangcang was due to climate change.

"The flies are not a new pest and it exists in many provinces. They only do harm to orange trees and not humans" Wan Fanghao chief scientist at the Biological Invasion Research Office said.

Wangcang is not very suitable for orange growth and the county government habeen pressing farmers to plant tea instead.

In Chengdu consumers remained calm.