Downy mildew, rust, powdery mildew… This week, gardener Jerome warns you about diseases that can infect your plants. It will also tell you how to grow celery.
Heat waves, storms … The weather is especially favorable for the development of diseases. One of the main reasons, the dreaded mushroom.
Once the plant has landed, they develop microscopic hyphae inside their host. This slows down its development and can lead to denaturation of the harvested parts and death of the plant.
Sudden changes in temperature and humidity, especially windy summer days, lead to the growth of the fungus. The same applies to excess fertilizer, watering, moist heat in greenhouses.
Some preventive measures can reduce the risk:
- Keep your crops well ventilated so that damp microscopic areas do not form which will be many sources of infection. For this, plant and sow widely, thinning out your seedlings in rows.
- Avoid sprinkler irrigation, opting instead to water by foot or drip for crops with wide distances. And above all, do not water it in the heat.
Don’t over water
The main diseases caused by fungi and common to many plant plants are mildew, powdery mildew, rust, botrytis.
Downy mildew attacks potatoes and tomatoes, as well as cabbage, spinach and onions. Its symptoms: yellowish-white spots appear on the upper side of the leaves, with purple-white streaks on the lower side – then zigzag brown spots on the fruits or on the tubers.
Thank you Bordeaux porridge
Preventive sprays of decoction of horsetail strengthen plants. Bordeaux mixture sprays are effective if they are done early.
Rust mainly affects lilies (garlic, leeks, onions, asparagus). Yellow to brown blisters appear and the leaves take on a rusty appearance and then dry out. Here, too, Bordeaux mixture should be used.
Its cultivation is often considered difficult. The easiest way is to buy seedlings in plugs from the producer.
They are planted 15 cm apart in rows spaced 40 cm. It should be buried as little as possible so that the root ball can grow.
As they develop, the outer stems are removed in favor of new stems that will result in an enlarged rootstock. It is necessary to mulch the well and water regularly