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Argentina Adopted Biological Control with Wasps Tamarixia radiata to Combat One of the Most Dangerous Citrus Pests: Greening (HLB). The Release of Thousands of Wasps Marks a Strategic Shift in the Use of Defensives and Highlights the Effectiveness of Natural Solutions in the Field.
In the province of Corrientes, northeast Argentina, an innovative initiative has captured the attention of producers and scientists. Instead of resorting to aggressive chemicals, the country is betting on a high-precision biological solution: the use of parasitic wasps to combat devastating pests. The measure was coordinated by the National Institute of Agricultural Technology (INTA), with the support of state agencies, and resulted in the release of more than 4,000 wasps of the species Tamarixia radiata — a powerful ally against the insect vector of the disease known as citrus greening or HLB (Huanglongbing).
This information was published in outlets such as Agrofy News and validated by documents from the Government of Corrientes, in addition to having technical support from the FAO in its manuals on biological control.
What is Greening and Why Is It So Dangerous?
Greening is one of the most destructive diseases in global citrus production. Caused by a bacterium transmitted by the citrus asian psyllid (Diaphorina citri), HLB compromises the entire physiology of the plants, leading to premature fruit drop, severe deformities, and, in many cases, the death of trees.
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In Argentina, the threat has grown in recent years with the presence of the vector in intensive production areas. The risk to the agricultural economy is high, especially for regions that heavily depend on orange, tangerine, and lemon production.
How Does Biological Control with Wasps Work in Argentina?
The use of wasps as a method of biological control is not new, but its application has gained scale and sophistication. In the case of HLB, the wasp Tamarixia radiata is the main natural enemy of the psyllid.
This wasp is microscopic and harmless to humans. Its action occurs through direct parasitism: it lays its eggs on the psyllid nymphs. After hatching, the wasp larvae consume the host, interrupting its reproductive cycle.
Moreover, the presence of wasps in the environment inhibits the proliferation of the vector, creating a prolonged ecological effect, even without continuous application.
Controlled Release in Corrientes
According to INTA Corrientes, the release of the wasps was conducted in experimental orchards and commercial production areas in the localities of Bella Vista and Monte Caseros. The operation involved trained technicians, who monitored the process from laboratory rearing to field release.
The initial results, according to local reports, indicate a significant reduction in the population density of the psyllid in the treated areas, positively reflecting on plant health.
This action is part of a broader strategy for integrated pest management (IPM), which includes monitoring with traps, the use of resistant varieties, and crop rotation.
Why Is Biological Control a Promising Alternative?
Biological control stands out for several reasons:
- Reduces dependence on pesticides
- Preserves beneficial organisms, such as bees and ladybugs
- Does not leave chemical residues on fruits
- Is safe for the applicator and the end consumer
- Has a prolonged residual effect
Additionally, the use of wasps helps combat one of the greatest challenges of modern agriculture: the development of genetic resistance of pests to chemical products.
The Argentine Experience in the Latin American Scenario
Argentina is among the Latin American countries that invest the most in agricultural research. The strategic use of wasps against pests positions the country as a regional reference in biological control, alongside Brazil and Mexico.
According to the FAO, these initiatives represent a step forward in terms of sustainable agricultural infrastructure, aligning productivity and environmental responsibility. The goal is to ensure food security and environmental health, while also protecting the profitability of rural producers.
The FAO (Food and Agriculture Organization of the United Nations) directly supports this type of action, providing technical guidelines, biological safety protocols, and incentives for producer training.
Meanwhile, INTA coordinates the laboratory rearing of wasps, effectiveness monitoring, and technical extension to farmers. Public biofactories, such as the one in Corrientes, are essential for scaling up the production of beneficial insects with quality control.
Challenges and Perspectives
Despite the initial success, the use of parasitic wasps requires:
- Constant monitoring to evaluate their effectiveness
- Integration with other management practices
- Continuous political and financial support
- Raising awareness among producers about their proper use
According to specialists from CONICET, there is potential to expand the use of wasps to other crops and regions in the country, including the use of different species to combat pests such as caterpillars, stink bugs, and fruit flies.
The release of parasitic wasps in Argentina, especially of the species Tamarixia radiata, is an important milestone in the fight against devastating pests such as citrus greening. The initiative shows that it is possible to combine technology, nature, and modern agriculture in an intelligent and sustainable way.
More than just combating an insect, these wasps represent a paradigm shift: less poison, more balance, with benefits for the producer, the environment, and the consumer.
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