Lechuga y similares
How to recognize and combat powdery mildew on lettuce and similar
Powdery Mildew
Fungus
Type:
Risk to the plant:
HIGH
Erysiphe Cichoracerum
Pathogen:
Oídio
WHO CAUSES IT?
Erysiphe cichoracearum is a biotrophic fungus that belongs to the order Erysiphales, responsible for causing powdery mildew in various plant species. This pathogen is characterized by forming white mycelia and sporangia on the surface of the leaves and other aerial parts of the plant. The cycle begins with the dissemination of conidia through the air, which find a susceptible plant in which to germinate and penetrate the tissues, forming haustoria that extract nutrients from living cells. Throughout its development, it produces new generations of conidia that continue the spread of the fungus. During the coldest months or in the absence of hosts, the fungus survives in specialized structures called cleistothecia, which house ascospores capable of resisting adverse conditions until the arrival of more favorable temperatures.
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SYMPTOMS
In lettuce and similar crops, Erysiphe cichoracearum causes powdery mildew, a disease that affects the growth and productivity of plants by interfering with their photosynthetic capacity and weakening them. The first symptoms appear as powdery white Taches on the leaves, stems or even flowers. As the disease progresses, the affected leaves tend to yellow, dry and fall prematurely, seriously affecting the quality of the crop.
- Appearance of whitish, powdery Taches on the surface of the leaves.
- Yellowing and weakening of the affected leaves.
- Premature fall of severely infected leaves.
- Delay in the general growth and development of the plant.
- Reduction in the quality and quantity of the harvest.
DEVELOPMENT CONDITIONS
Temperature:
15-25°C
Humidity:
50-80%
HOW IS IT SPREAD?
Air, wind, infected plant debris, contaminated tools, contaminated irrigation water
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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