Foliar application of kaolin on Coffea arabica reduces Leucoptera coffeella infestation
aluminum silicate, behavioral control, coffee leaf miner, coffee production, IPM
The application of mineral-based particles, such as kaolin, has shown promise as a sustainable management strategy of important crop pests. The coffee leaf miner, Leucoptera coffeella, is considered a key coffee pest in several producer countries, and its control is predominantly performed by successive chemical insecticide applications. The aim of this study was to evaluate the effects of kaolin foliar applications on L. coffeella oviposition preference and injury in Coffea arabica under laboratory and field conditions. In the laboratory and field experiments were evaluated the kaolin doses of 10, 20, 30, and 40 g/L of Surround® WP, in addition to a control treatment (water). Two free-choice oviposition experiments were conducted in the laboratory using detached leaves and coffee seedlings treated with kaolin doses, evaluating the numbers of eggs, oviposited leaves, mines, and injury by L. coffeella. Two field experiments were carried out during the 2023 and 2024 seasons to assess the efficacy of kaolin doses on the number of mines, percentage of mined leaves, and infestation severity. The integrated analysis of the laboratory and field results demonstrated that L. coffeella oviposition preference and injury were inversely proportional to kaolin doses, with higher doses of 30 and 40 g/L providing better effects. Information obtained from this study expands the current understanding of kaolin effects on L. coffeella, highlighting its potential as a sustainable pest management strategy in coffee production.