Brazilian research into botanical insecticides is yielding promising results for managing the Asian citrus psyllid that spreads citrus greening disease. Studies by Fundecitrus show that products based on natural compounds can serve as allies in controlling the psyllid and help reduce resistance to traditional chemical insecticides.
TARGETING NYMPHS
During the 2024–25 citrus season, more than 30 plant-based products were evaluated in laboratory and field settings. Formulations based on essential oils and plant-derived compounds caused high mortality rates among psyllid nymphs. Controlling nymphs is strategic because this development stage of the insect is more vulnerable due to its low mobility.
“These products are usually applied during shoot development, when there is a high concentration of nymphs, as they develop exclusively on shoots,” said Fundecitrus postdoctoral researcher Thiago Agostini. “That is the ideal timing for botanical insecticides, as they are effective only against nymphs, and the spray solution must directly contact the insect.”
CHEMICAL INSECTICIDES STILL NEEDED
Despite these positive results, researchers emphasize that these products should be used along with conventional chemical management.
“Since they do not have residual effect, botanical insecticides should be used in conjunction with chemical insecticides, as this helps mitigate insect resistance to new molecules,” Fundecitrus researcher Haroldo Volpe said.
These studies highlight the progress being made toward more sustainable alternatives for citrus farming. The use of natural compounds can expand management options, balancing productivity with environmental preservation.
Learn more about this topic in issue 63 of Fundecitrus’ Citricultor magazine. An article in that issue — “Botanical insecticides: Successful control of psyllids” — notes that botanical insecticides contain bioactive compounds capable of acting against insects through toxic effects, feeding deterrence or growth regulation. The products can be obtained from extracts, essential oils and isolated substances derived from different plant parts such as seeds, leaves, roots or fruits.
Source: Fundecitrus
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