UPDATE 1-Argentina probes Cargill for suspected evasion-source

* AFIP tax agency investigates agribusiness giant

* Cargill top exporter of Argentine soyoil, meal last year

* Bunge premises raided last week as part of tax probe (Adds quote, background)

BUENOS AIRES, Oct 6 (Reuters) - Argentina's tax agency is investigating the local unit of agribusiness giant Cargill [CARG.UL] for suspected tax evasion, a senior customs official told Reuters on Wednesday.

Fellow grains exporter Bunge (BG.N) had its Argentine premises raided last week as local authorities investigate accusations by the AFIP tax agency that the company evaded as much as $298 million in income tax. [ID:nN01107902]

"The AFIP is investigating Cargill," the official said, speaking on condition of anonymity.

Late last month, the AFIP agency accused four of the country's largest grain exporters of evasion during last year.

Argentina is the world's No. 3 soybean exporter and the top supplier of oil and meal, but the government of President Cristina Fernandez has a tense relationship with the agricultural sector.

Soy is Argentina's No. 1 export earner and Rosario grains exchange sees this year's agricultural exports totaling $24 billion due to a bumper soy and corn harvest.

Privately held Cargill was Argentina's biggest exporter of soyoil and soymeal last year, followed by Bunge Argentina, Agriculture Ministry data shows. (Reporting by Luis Andres Henao and Karina Grazina; Editing by Lisa Shumaker)