Blight on lemon plants: symptoms, causes, control

Blight is a fungal disease that affects lemon plants and causes a deterioration in the overall health of the plant. This article from the “WORLD OF PLANTS” website provides an explanation of the symptoms of blight on lemon plants and methods of prevention and control.

Causes of blight on lemon plants

• Name of the disease: Blight on lemon plant
• Scientific name: Pseudomonas syringae
• Type of disease: Bacterial
• Disease family: Pseudomonas

Lemon plants suffer from blight due to the presence of bacteria Pseudomonas syringaeThese bacteria live on the surface of the leaves and become pathogenic in long-term, humid weather conditions. The damage is more severe on the side exposed to winter winds.

Symptoms of blight on lemon plants

Symptoms of infection appear in the form of black spots in the leaf petals and advance to the neck of the leaf, leading to the leaves withering and wrinkling, but they remain attached to the branches and fall in the case of severe infection. Entire branches may also die, and the infection can lead to the appearance of small black spots on the fruit.

The development cycle of blight on lemon plants

These bacteria enter the plant through leaf pores, and wounds on the branches caused by thorn punctures, strong winds, or insect injuries can help spread the bacteria within the plant.

Suitable conditions for the spread of blight on lemon plants

Wet, cold, and windy conditions during winter and spring greatly favor the development and spread of blight bacteria. Pseudomonas syringae In the ice, which means that it lives under harsh weather conditions and temperatures below zero degrees Celsius.

Losses resulting from the spread of blight on lemon plants

Blight bacteria attack the immature leaves of lemon plants, which affects the health of the plant in general. As the infection intensifies and the plant continues to be exposed to frost and rain, the size and quality of the fruits decrease, and the plant may die in some cases.

Controlling blight on lemon plants

1. Adding iron chloride compounds to hydroxide granules at the beginning of winter and before the field is exposed to frost.
2. Apply copper compounds to the plant correctly.
3. Planting windbreaks.

Preventive measures for blight on lemon plants

1. Use dense varieties with relatively few thorns to prevent wind injury.
2. Pruning dead or diseased branches in the spring after the rainy period to limit the spread of the disease.
3. Good fertilization of the plant helps in resisting bacteria.
4. Sterilize agricultural tools before use.

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• Sources:
• Bacterial citrus blight - plantix
• Bacterial Blast (Citrus Blast) – UNIVERSITY OF CALIFORNIA AGRICULTURE AND NATURAL RESOURCES