Key garment makers in Cambodia are calling on the country's Government to exercise more regulation of labour unions, as continued strikes threaten local trade.

According to Agence France Presse, there are an average of four unions per factory and it is proving too much to manage for many manufacturers.

Van Sou Ieng of the Garment Manufacturers Association of Cambodia (GMAC) told the agency that illegal strikes are happening daily.

"The frequency of these becoming alarming, and if left unattended and unresolved, they will destroy Cambodia's reputation for attracting and maintaining investors," he was quoted as saying.

The garment sector is vital to the country's economy, accounting for 80% of exports. The GMAC is encouraging more collective bargaining agreements between factory owners and unions.