In 2024, Brazil observed a 40% reduction in the population of HLB-transmitting psyllids compared to the previous year. Despite this decrease, the psyllid population remains above the average levels recorded between 2014 and 2019, before resistance to certain insecticides was detected.
Fundecitrus highlights the importance of effective control strategies to prevent future increases in psyllid populations. Marcelo Miranda, a researcher at Fundecitrus, noted, "To further reduce the psyllid population, it is essential to rotate insecticides that are highly effective in controlling the insect."
Variations in psyllid populations are influenced by climatic conditions and field management practices. Between 2014 and 2019, the average number of psyllids per trap in São Paulo's Citrus Belt was under 0.3, a low level. However, since 2020, there has been an increase, with the population reaching its peak in 2023. Resistance to pyrethroids and neonicotinoids has been a significant factor in this growth.
Maintaining a declining trend in psyllid populations and preventing further increases requires proper management strategies. Fundecitrus stresses the need for constant monitoring and strategic product use to control resistance impacts.
Brazilian citrus growers can utilize the Evaluate Psyllid online tool for guidance on effective management. This free tool offers updated information on insecticide efficacy across different regions of the Citrus Belt, enabling growers to select suitable products for psyllid control. Evaluate Psyllid is regularly updated with new data to ensure accurate support for field decisions.
Source: Citrus Industry