Polillas
Leaf Mining Moth
Cameraria Ohridella
Pathogen:
Insect
Type:
Risk to the plant:
HIGH
DESCRIPTION
WHO CAUSES IT?
Cameraria ohridella, known as the leaf mining moth, is a small lepidopteran that mainly affects chestnut trees. Adults emerge in spring, usually in May, and are characterized by their brown front wings with white Taches. Females lay their eggs on the surface of leaves, where the larvae hatch and penetrate the leaf tissue. The larvae feed on the mesophyll of the leaves, creating mines that are visible as transparent Taches. This process lasts several weeks, after which the larvae pupate inside the mines. The moth can have several generations per year, especially in warm climates, which increases its ability to cause significant damage to chestnut trees. During the winter, pupae can survive in fallen leaf litter, resuming their activity with rising temperatures the following spring.
SYMPTOMS
The leaf mining moth causes significant disease in chestnut trees, primarily affecting the leaves. Symptoms begin with small yellowish Taches on the leaf surface that progressively expand.
- Yellowish Taches that expand on the leaves.
- Presence of visible mines, which are transparent or brown areas on the leaves.
- Premature defoliation due to the high density of mines.
- Reduction in plant photosynthesis, affecting its growth.
- General weakening of trees, making them more susceptible to other diseases and pests.
- Mass leaf fall in severe cases, especially towards the end of summer.
- Presence of pupae in the leaf litter around the tree.
- Decrease in chestnut production due to the loss of tree vigor.
TEMPERATURE AND HUMIDITY
20°C - 25°C
60% - 80%
HOW IS IT SPREAD?
Wind, movement of infected leaves, transport of contaminated wood, direct contact with infected trees, spread by contaminated tools
HOW TO REMOVE IT?
Home remedies
There are no home treatments
Chemical treatments
• AZADIRACTIN 1% (AS AZADIRACTIN A) [EC] P/V
• MOTH TRAPS
Authorized treatments in organic farming
• AZADIRACTIN 1% (AS AZADIRACTIN A) [EC] P/V
• MOTH TRAPS
Insect allies
PREDATORY MITES
LADYBUGS
LACEWINGS
PARASITIC WASPS
HOVERFLIES OR PARASITIC FLIES
PREDATORY BUGS
There are no natural allies
Mycodiplosis oidii (predatory mosquito)
EFFECTIVE PRODUCTS TO ELIMINATE THIS DISEASE
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- Collect and destroy fallen leaves around trees to reduce the pupa population.
- Apply specific insecticide treatments in spring, when adults emerge and larvae are active.
- Use pheromone traps to monitor the adult population and determine the optimal time to apply insecticides.
- Introduce natural enemies, such as parasitoid wasps, which can help control the moth population.
- Maintain adequate fertilization and irrigation to strengthen trees and improve their natural resistance to pests.
- Implement a rotation of insecticides with different modes of action to prevent the development of resistance.
- Prune low branches and remove dense vegetation around trees to improve air circulation.
- Regularly inspect trees for early signs of infestation and act quickly.
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