Lechuga
How to recognize and combat armyworms in lettuce
Gardama, Green Donut, Or Armyworm
Insect
Type:
Risk to the plant:
HIGH
Spodoptera Exigua
Pathogen:
Orugas o gusanos
WHO CAUSES IT?
Spodoptera exigua, commonly known as armyworm or green donut, is a species of moth whose larvae are highly harmful to various crops. Adults of Spodoptera exigua are grayish-brown moths that lay their eggs in groups, usually on the undersides of leaves. Each female can lay hundreds of eggs in her lifetime. Newly hatched larvae feed on leaf tissue, passing through five to six larval stages before becoming pupae. The pupal phase occurs in the soil, where the larva buries itself to complete its transformation into an adult. During the initial stages, the larvae are small and greenish, but as they grow, they take on a darker green or brown color with longitudinal stripes. Under favorable conditions, the pest can have several generations per year, which favors its rapid proliferation.
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SYMPTOMS
In lettuce, Spodoptera exigua causes serious damage by feeding on the leaves, especially during its larval stages. Symptoms of infestation are notable, as the larvae feed on large areas of leaf tissue, leaving irregular marks and holes in the leaves. In severe infestations, plant growth is severely affected, reducing crop yield and quality. In lettuce, the infestation can result in the almost total destruction of the plant if it is not controlled in time.
- Irregular holes in the leaves.
- Partial or complete defoliation of the plant.
- Slow or stopped growth.
- Visible damage to young and mature leaves.
- Dry or withered leaves due to loss of leaf tissue.
- Presence of larval excrement on the leaves.
DEVELOPMENT CONDITIONS
Temperature:
20-30°C
Humidity:
60-80%
HOW IS IT SPREAD?
Wind, movement of infested plants, contaminated growing tools, dispersal of flying adults
HOW TO ELIMINATE IT?
Home treatments
There are no home treatments
Natural allies
Chemical treatments
There are no treatments for this disease. Treatments are directed at the insect vectors that transmit it. See insect treatments.
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