Argentina Uses Nuclear Technology to Control Insect Pests

SIT has also helped Mendoza — a region in western Argentina famous for its peaches and plums— maintain the fly population at very low levels since 2009.

“I have grown peaches and apricots since 1995,” said Roberto Guirado, a producer in Mendoza. “When the fly came, you could see the damage caused by the larvae in the fruit. Nobody would buy it in the market.” Fruit like the one Guirado produces in Mendoza is usually sold in Buenos Aires and San Luis, but at the time the Mediterranean fruit fly spread, shipments were restricted, resulting in a 30% loss for him. “My fruit was soft, it fell, and it had holes in it as if a needle had pierced it. I wouldn’t have bought any of it myself.”

But thanks to the daily release of sterilized fruit flies, the pest gradually decreased. In his 13 hectare farm, Guirado’s production has returned to its original level. The best part about the technique, he said, was that he didn’t have to apply strong pesticides that could harm the environment or his own health.

Check this photo essay to see how the sterile insect-rearing facility in Mendoza works.

Argentinian scientists are currently working with the IAEA and the FAO to apply SIT in the northeast of the country, where they have already started trial releases of sterilized fruit flies in pilot areas. The idea is to reduce direct damage to citrus production while also restricting insecticide use.

“Ideally, we would be creating two large belts of Mediterranean fruit fly-free areas,” said Gustavo Taret, engineer at the Institute of Health and Agricultural Quality in Mendoza, ISCAMEN. “One starting in the north and the other in the south. The idea is to control the fly population in all affected regions, gradually, until both belts meet in the middle.”

Mosquito: the new challenge

After this success, Argentina is looking into the possibility of applying SIT to Zika-transmitting mosquitoes, a possibility that is still at the early research stage.

“We recovered from a fruit pest only to dive into a new problem: Zika,” said Celina Horak, Manager of Radiation Applications at the Argentine Atomic Energy Commission (CNEA).

In 2016, Argentina reported more than 41 000 confirmed cases of dengue, 322 of chikungunya and 21 of Zika, all diseases caused by viruses that are transmitted by the Aedes aegypti mosquito. This year, Zika cases have increased considerably, reaching a peak of 102 suspected cases during week 14.

Responding to requests for assistance at the height of the Zika outbreak in 2015, an IAEA technical cooperation project kicked off to help 21 countries in Latin America and the Caribbean, including Argentina, develop the SIT package to suppress Aedes aegypti mosquito populations.

Since the start of the project, Argentina has made significant progress. “We are already conducting studies in cages and laboratory assessments in our mosquito rearing laboratory at the Ezeiza Atomic Centre, and the plan is to do pilot testing in Posadas in 2019,” Horak said.

In the absence of vaccines and efficient, safe and inexpensive drugs to manage Zika and some of the other diseases, SIT may become an option for the region. Reducing the population of this type of mosquito, in addition, may also curtail the spread of other mosquito-borne viruses.

“Zika was a wake-up call,” said Hanano Yamada, entomologist at the IAEA involved in the project. “Probably this is not the last virus that will show up in Latin America, transmitted by Aedes aegypti.”