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Damping off

Posted Tuesday, January 18, 2022 ( 9 months ago)

Last updated: January 18th, 2022

Diseases caused by fungi such as Fusarium spp., Pythium spp., Rhizoctonia, and Sclerotium spp. This weakens the seed germination. The basal part of the seedling turns black and rots. In some cases, the feet and roots turn black and the roots dry out.

Diseases occur in nurseries for a variety of reasons. Parasitic organisms are one cause. The disease is transmitted from one plant to another. Fungi, bacteria, viruses, and microplasma are parasitic organisms. There are also non-parasitic causes. They are also known as physical ailments. Mechanical Damage Such diseases are caused by environmental and soil conditions and do not spread from tree to tree. In order for a disease to spread to another plant, there must be a host plant as well as an environment conducive to it. Just because a pathogen is in the environment does not mean it is a disease.

Therefore, the spread of the disease can be largely controlled by eliminating the environmental factors that contribute to the spread of the disease. Most nursery diseases are caused by soil-borne pathogens. Pythium species, Rhizoctonia Solanaceae, Fusarium species Alternaria species Myrotium Ropfsi are among them. The condition they cause is known as diarrhea. Infection and spread of nursery plants by these pathogens depend mainly on environmental conditions.

Damping off Disease

Diarrhea can occur in the nursery in two stages. Pre-diatomaceous earth occurs when the seed germinates. Then the seeds rot. Therefore, germination does not occur.

Post-diatomaceous earth blight occurs when the seeds germinate and the seedlings begin to grow. Despite the moisture in the nursery, it quickly withers and collapses at the base of the trunk.

There are several factors that contribute to the spread of diarrhea. Temperature is a major factor
Since the germs released during germination contain sugars and amino acids, they are very helpful in attracting bile species.

Damping off Symptoms

  • Seed germination is poor.
  • The basal part of the seedling turns black and rots
  • In some cases, the feet and roots turn black and the roots dry out.
  • When the plant is examined, it can be seen that there are brown spots on the base of the stem, rot at the base, dry rot at the base, or twisted stem of the plant.
  • Nurseries can be susceptible to sudden death. Here and there the plants wither and die

Damping off control

When choosing a nursery site, it is important to have good sun exposure. High humidity under the shade is conducive to the growth of pathogens.

Vegetation that grows in the direction of the plant in search of shady herbaceous sunlight is easily susceptible to such plant diseases due to weak seeds.

Areas with uncultivated soil are best suited by selecting a nursery and one that has not been planted in the area prior to the crop that the nursery expects.

The presence of diseased debris in the field makes it easier for pathogens to enter the new nursery so it should be

It is important to have well-drained ground. If water transport is poor, there will be favorable environmental conditions for pathogens that will improve soil effect and environmental humidity. Therefore, the drainage ditches should be designed so that the selected area is easily drained.

The nursery is well-drained and the roots are well ventilated to detect the spread of disease.

Nursery land should be a place where clean water is available. By supplying water coming through the diseased areas to the nursery floor or allowing it to flow through the nursery floor, it is an easy step to allow the pathogens to enter the nursery ground.

High winds cause mechanical damage to native plants, which can lead to secondary diseases. Therefore, locations for such devices should not be selected. Otherwise, wind barriers should be provided.

A place that is easily inspected on a daily basis and shines has the opportunity to quickly identify diseases.

Even if the nursery soil is properly disinfected, it may fail if the nursery is not properly managed. It is very important to ensure that the seeds that are planted are healthy.

Seeds produced by themselves must be seed-treated.

The seeds begin to form rows, and when it shrinks, seedlings with uniform growth occur. Even if a disease occurs, it is easy to control.

Vegetable seeds are small so they can grow up to 5 cm from the nursery surface. Planting 1–2 is desirable. A little more pressure should be applied. Due to this, the seedlings are more likely to be damaged.

Also, shallow planting is not recommended. Allow the seeds to come to the surface of the soil with watering.

It is very important to cover the seeds after sterilization after depositing the seeds in the nursery bed.

Accordingly,

Nurseries that are prone to herbivorous plants can help prevent the spread of weeds in and around the nursery.

Excessive watering facilitates the spread of disease, which causes occasional waterlogging in the dry and wet conditions of the nursery.

It is very important to provide water for the growth of the plants evenly. High temperatures and high temperatures are favorable for special growth.

Nursery watering should be done in the morning or evening. Plants need water, not soil.

Damage to roots and stems can be minimized after transplanting in the field by minimizing damage to the roots and stems during nursery survival.

Damping off Treatment

Damping off chemical control / Damping off Fungicide

50% Thiophanate-methyl and 30% thiram are suitable for diuretics caused by fungi such as Fusarium, Sclerotium, and Rhizoctonia.
These fungicides are not suitable for Pythium and Phytophthora fungi.

Damping off When the causative agent has not been identified, it is advisable to use fungicides such as Captan, Thiram, Chlorothalonil 75% wet powder.

Remove diseased plants with soil and dilute the fungicide used for soil treatment in water and water the plants and soil well.

Drains need to be deepened to allow the nursery water to drain well.