Downy mildew is a fungal disease that affects lemon leaves and causes a deterioration in the tree's health. In this article from the “WORLD OF PLANTS” website, we discuss the symptoms of downy mildew on lemon leaves and effective prevention and control methods.
Causes of downy mildew on lemon leaves
- Disease name: Downy mildew on lemon leaves
- Scientific name: Oidium citri
- Type of disease: fungal
- Disease family: Oomycete
This disease is caused by a fungus Oidium citri Which usually spreads in the spring, white to gray fuzzy bumps form on the leaves of the affected plant, which is why the disease is given this name.
Symptoms of downy mildew on lemon leaves
Young leaves turn white or gray as a result of the presence of burrs, and in the case of severe infection, they cause deformation of the leaves and buds, leading to the premature fall of leaves and fruits and the death of twigs and branches.
Development cycle of downy mildew on lemon leaves
The disease can be transmitted over long distances by wind, and agricultural equipment such as pruning tools, mechanical harvesters, etc. have a role in transmitting the disease from one plant to another.
Suitable conditions for the spread of downy mildew on lemon leaves
The fungus spreads in shady, poorly ventilated orchards, and it needs moderate to cool temperatures. This is the reason for its spread in the spring, when rainfall is frequent and temperatures remain cool.
Losses resulting from the spread of downy mildew on lemon leaves
If the infestation is neglected, the infestation may develop and may cause other diseases, which greatly reduces tree productivity and fruit quality. Therefore, continuous monitoring of the field and early detection are among the most important factors to avoid major losses in the field.
Control of downy mildew on lemon leaves
- Remove infected leaves and burn them away from the field.
- Cleaning the field of harmful plants and plant residues.
- Use of pesticides containing dithiocarbamate.
- Avoid overhead watering and watering in the early morning hours to prevent providing a damp environment to suppress the spread of the disease.
Preventive measures for downy mildew on lemon leaves
- Planting disease-resistant varieties.
- Determine good distances between trees planted in the field in order to give them proper ventilation and avoid transmitting infection between close trees.
- Organizing and sterilizing agricultural tools before use.
- Good and moderate fertilization.
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Sources:
Downy mildew – lovethegarden
Tips For The Control Of Downy Mildew – gardeningknowhow
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