Brazil in 'crop emergency' as locusts near

Brazil's agriculture ministry has declared a crop emergency in two southern states amid the possibility a cloud of locusts could enter the country from Argentina.

The "state of phytosanitary emergency" is a bureaucratic step paving the way for Brazil's government to implement plans to suppress the plague and take other emergency measures in case the insects reach the farmland in Rio Grande do Sul and Santa Catarina states.

The ministry said in a statement it doesn't currently expect that to occur.

The cloud of locusts that originated in Paraguay and caused massive damage to its corn plantations has, for the past several days, spread through northeast Argentina and devoured crops there.

On Thursday, it was about 100km from Brazil's border, according to Argentina's food safety and health authority Senasa.

Senasa said current climate conditions indicate it is most likely the cloud travels to Uruguay in the coming days.

Brazil's agriculture ministry likewise said in its statement that meteorological data for the southern region indicates low probability of the cloud entering Brazilian territory.

"We have hope that if some of the cloud reaches Brazil, it will be much diminished," agriculture minister Tereza Cristina said.