Recently, it is a good time for seeding and cultivating various vegetables, but there are many shed households who have reacted to their own vegetable seedlings, and how to prevent it? In general, the squatting disease is a seedling disease, which often occurs after the seedlings are unearthed and before the true leaves have been unfolded. Water-stained dark spots appear at the base of the young stem, and then expand around the stem, gradually shrinking and appearing as a thin line and lodging. When the disease is serious, the seedlings often fall into pieces.
First, the damping-off disease hazards
The disease is a disease at the seedling stage of the crop, and the pathogen damages the base of the stem of the plant. Plants onset of symptoms very similar to the blight, damping-off and make a distinction here: damping-off occurred in the nursery in late. The main hazard or underground stem base seedling root, first as oval or irregular dark brown spots, wilting seedling disease early daytime, nighttime recovery, the disease gradually recessed portion, the overflow reduction, some dark brown gradient, when expanded around the lesion stems week. Finally dry death, but not lodging.
Damping-off in addition to the harm eggplant, vegetable seedlings of lettuce, celery, cabbage, kale, carrots, onions and other harmful effects have different degrees.
Second, the prevention and treatment measures
1. Selection of nursery sites
Choose a place where the terrain is high, the groundwater level is low, the drainage is good, the water source is convenient, and the shelter from the wind is sunny.
Spraying 500-1000 times of potassium dihydrogen phosphate or 1000-2000 times of calcium chloride in the seedling stage to improve disease resistance.
2. Strengthen seedbed management
According to the conditions of the seedlings, timely release of the wind, avoid low temperature and high humidity conditions, do not water in the rainy days, try to eliminate the dripping phenomenon of the film.
Strengthen the management of the seedbed with fertile, loose, disease-free new bed soil. If the old bed is used, soil treatment must be carried out.
The fertilizer must be decomposed and evenly distributed; the seeding should be uniform and not too dense, and the cover soil should not be too thick.
According to the soil moisture and weather conditions, when it is necessary to sprinkle water, it should not be too much each time, and it should be carried out in the morning; when the bed soil is humid, the dried soil will be dehumidified.
At the same time of doing the seedbed insulation work, it is light-transparent and moderately ventilated.
3. Chemical control
Copper rosinate was used at the time of onset. The drug control begins to be applied at the beginning of the disease, with an interval of 7-10 days. General control 1-2 times, and timely removal of diseased plants and adjacent diseased soil.
Pharmacy selection:
75% chlorothalonil WP 600 times solution
70% mancozeb WP 500 times solution
58% metalaxyl · manganese zinc wettable powder 500 times liquid
72% cream urea·manganese zinc wettable powder 600 times liquid
69% enoylmorphin·manganese zinc wettable powder
Water dispersible granules 800 times solution.
[Note: In order to reduce the humidity of the seedbed, it should be sprayed in the morning. 】
4. Physical control
In the physical plant protection technology method, the current between the plant root system and the soil solution induced by the forward space electric field established in the plant growth environment can cause the electrolysis of water to generate oxygen, promote the increase of oxygen content in the rhizome, and enhance the vitality of the root system. Improve disease resistance.
On the other hand, the atomic oxygen generated by the electrochemical reaction kills some soil microorganisms, reduces the number of susceptible bacteria, and further reduces the incidence of stagnation.
5. Plant protection essentials
1. Remove the diseased plants in time and sterilize the original points.
2. When watering, the healthy plot is separated from the affected plot.
3. Fully permeate the root part of the whole crop when filling the medicine.
4, can not be watered for three days after medication, in case of heavy rain or must be re-watered application, should be used again after the rain or after watering.
The above is the comprehensive prevention and control points of squatting disease. Regardless of whether or not this disease occurs in your family, first come to Huinong.com to learn more about related prevention and treatment techniques.
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