Leaf spot disease
- Other plant pests & diseases: Pests & diseases
One fungus that causes this disease is: Cercospora zonata.[1]
This is a fungal disease that shows light brown spots on leaves. The spots dry up and the leaf dies. Pear trees can develop orange-yellow stains that become bumps in autumn.
Some plants that are sensitive to this disease: Currant, bean, chrysanthemum, pea, cereals, pears, leeks, plum, celery, and tomatoes.
Many of the leaf spot fungi have a similar life cycle. The fungus overwinters on fallen leaves. In the spring, during or following a rain, spores produced by the fungus are discharged and carried by wind and splashing rain to newly emerging leaves. If a film of water is present on the leaf, the spore germinates and penetrates the leaf and causes infection. After some time, depending on temperature, small spots appear on the leaves. Gradually the spots enlarge.
Leaf spot fungi favor cool and wet weather early in the growing season.[2]
Preventive measures: Choose resistant varieties. In a greenhouse, don't spray water over the plants but only on the soil. Practice combination planting. Make sure that your soil is healthy and rich with humus (add good compost, add mulch). Spray with an extract of Valerian flowers, horsetail or onion peel tea (i don't know how effective these are).
Burn the plants and leaves that were affected.
See also
References
- ↑ Cercospora zonata - Wikipedia
- ↑ Leaf Spot Disease of Trees and Shrubs University of Connecticut
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