Treasure Book of raising Orchid: talking about the Prevention and Control of soft Rot from the characteristics of pathogenic bacteria

Orchid planting and cultivation: talking about the Prevention and Control of soft Rot from the characteristics of pathogenic bacteria

Recently, I have consulted some information related to soft rot, and the excerpts are as follows:

Orchid soft rot is an infectious bacterial disease in plant diseases, and its pathogenic bacteria are Eucalyptus.

The characteristics of plant pathogenic bacteria are:

1. Bacteria are a kind of prokaryotic unicellular organisms with simple structure, a few are autotrophs and most are heterotrophs. In heterotrophic bacteria, most of them are saprophytic and a few are parasitic.

2. Bacteria reproduce in the way of bifid, and reproduce very fast. Under suitable conditions, they can reproduce every 20 minutes, and a cell can reproduce to hundreds of millions after one day and night.

3. Bacteria do not contain chlorophyll, can not self-made nutrients, rely on parasitic and saprophytic survival, are heterotrophic organisms. All plant pathogenic bacteria are non-specific parasites. Highly parasitic pathogenic bacteria infect the green parts of plants, and saprophytic pathogenic bacteria infect the storage organs or parts of plants with weak resistance.

4. Most of the pathogenic bacteria are aerobic, a few are also anaerobic, and the pathogenic bacteria can withstand low temperature. The most suitable temperature for growth is about 30 degrees. Except for a few who like high temperature, they generally stop growing at 40 degrees.

5. There are two main ways for pathogenic bacteria to invade parasitic plants, one is natural orifice invasion, the other is wound invasion.

6. when bacterial diseases occur, some physiological changes that can not be observed externally occur at the affected site, resulting in physiological lesions, followed by pathological changes in cells and tissues, and finally to pathological changes that can be observed from the outside.

7. Euclidean bacteria are solitary, short rod-shaped, aerobic or anaerobic, and some require special growth substances to supply organic nitrogen compounds, which generally grow well. Eucalyptus bacteria are parasitic in plant types, causing plant tissue dissociation and showing symptoms of soft rot.

After understanding some characteristics of the pathogenic bacteria of bluegrass soft rot, in view of these characteristics, combined with their own practice for many years, we should do a good job in the prevention and control of bluegrass soft rot from four aspects.

First, the environment is the basis for the prevention and control of bluegrass soft rot.

1. Cleanliness and hygiene

Starting from the grass-raising environment, pots, plant materials, utensils, etc., we should do a good job in cleaning and hygiene in an all-round way to reduce the breeding of harmful bacteria.

2. Dry and wet

Grass-raising environment, pots, plants can not be often wet, especially in high temperature and humidity, in a certain period of time to keep dry.

3. Regular disinfection

After the grass-raising environment is dry, disinfection, sterilization and insecticidal are carried out in time, and the effect is better.

Second, management is a means to control the soft rot of bluegrass.

1. Strengthen ventilation

Eucella is both anaerobic, ventilation can increase the supply of oxygen, oxygen can kill or prevent the growth of Eucella, ventilation should constantly supplement fresh air, the effect is better.

2. Moderate water control

In the case of high temperature and humidity, the orchid basin can not be often wet and moist, it is necessary to properly control the water, dry management, the plant material will be loose, fresh air can enter the plant material and play a role.

3. Moderate lighting

High temperature shading, but not too tight, there should be scattered light, conditional direct light before 8 o'clock in the morning should be fully utilized, both sterilization and strong grass.

4. Use less chemical fertilizer

Some Eucalyptus nutrition requires special growth substances, that is, organic nitrogen compounds. Based on this property, little or no fertilizers containing organic nitrogen compounds are used to cut off the source of nutritional requirements for Eucella.

5. Reduce worries

Do not love too much, reduce the artificial worry and injury to bluegrass, and prevent wounds.

3. In the aspect of bluegrass, bluegrass is the key to control the soft rot of bluegrass.

1. Take good care of the introduction

The greenhouse grass of introduced tissue culture seedlings is easy to suffer from soft rot, which is not caused by its own bacteria, but by its own lack of adjustment and adaptation ability and weak resistance. In the introduction, we should pay equal attention to the bluegrass and the environment, and try to choose the bluegrass with similar or worse environmental conditions. No introduction during the period of high temperature and humidity, the best introduction is in autumn, so bluegrass has a longer adaptation period.

2. Raise orchid grass

The really strong bluegrass has strong adjustment and adaptability and good resistance, but it can not be raised by greenhouse and fertilizer. Growing really strong bluegrass requires plenty of light, a changing temperature difference, frequent experience, and enough time.

3. Control the growth too fast

When it is hot and humid, it is also the fastest time for bluegrass to grow. When bluegrass grows fast, its resistance will be weakened and harmful bacteria are easy to invade. Controlling the rapid growth of bluegrass is also the key to prevent the disease of bluegrass.

4. Treatment is a passive measure to prevent and cure the soft rot of bluegrass.

1. Soft rot has no rule of law.

From item 6 of the characteristics of plant pathogenic bacteria, it can be known that by the time the symptoms can be found with the naked eye, the invading bluegrass is in its late stage and no medicine is available.

2. Diligent observation and early discovery

Although there is no rule of law for soft rot, it is still necessary to observe it diligently and be particularly careful with key bluegrass, orchid pot and bluegrass. Only when they are detected early can they be dealt with early, with less infection and less loss.

3. Treatment method

Once soft rot is found, it should be dealt with in a timely manner. The conventional and the most effective method at present is the seedling separation method. First take off the basin, cut from the farthest seedling, one seedling separated, to the cut discolored grass. If there is only one or two seedlings, do not take off the basin, first use the medicine, and then stop the water, let it dry thoroughly, and then water the bluegrass when it is dehydrated, try your luck.