The leaf miner (Leucoptera coffeella) is one of the most significant pests for coffee crops, especially in regions with hot and dry climates.
In Brazil, Leucoptera coffeella It is commonly known as the coffee leaf miner or simply the coffee leaf miner.
Crops attacked
The leaf miner is a monophagous pest, that is, it exclusively attacks plants of the genus Coffea, mainly affecting the coffee plant.
Biology
The leaf miner's life cycle includes four stages: egg, larva, pupa and adult.
- Eggs: females lay around 60 eggs on the upper surface of coffee leaves.
- Larvae: when they hatch, the larvae penetrate directly into the leaf mesophyll, feeding on the parenchyma and forming galleries known as "mines".
- Pupae: after larval development, the caterpillars descend via silk threads to lower leaves, where they build "X" shaped cocoons to pupate.
- Adults: They are small, silvery-white moths with a wingspan of approximately 6,5 mm.
The complete cycle varies from 19 to 87 days, depending on environmental conditions, allowing 8 to 12 generations per year.
Ecology
The leaf miner is favored by conditions of high sunlight and low relative humidity, common in regions with hot and dry climates.
Its incidence is higher during dry periods, especially between March and September.
Factors such as wide spacing between plants, which increases air circulation, and unbalanced fertilization can intensify the infestation.
Damage
The larvae cause damage by feeding on leaf tissue, forming mines that lead to necrosis and leaf fall.
This reduces the plant's photosynthetic capacity, compromising its development and productivity.
In severe infestations, defoliation can affect up to 75% of the plant, resulting in productivity losses that can reach 87%.
Control
Effective leaf miner management involves an integrated approach, combining different methods:
- Monitoring: regular monitoring of crops to identify infestation levels and determine the appropriate time for interventions.
- Cultural control: practices such as planting density to reduce sunlight on the leaves and balanced fertilization to strengthen the plants.
- Biological control: use of natural enemies, such as predatory wasps, to reduce the pest population.
- Chemical control: application of specific insecticides, respecting technical guidelines to avoid resistance and environmental impacts.
The integration of these strategies, combined with knowledge of local conditions and technical monitoring, is essential for efficient control of the leaf miner and maintenance of coffee crop productivity.
To learn more about Leucoptera coffeella, click on:
To find out which pesticides are registered for control, click on:
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