In early spring, the temperature is low and the light is weak. The greenhouse eggplant often has various abnormal conditions. The common problems and prevention and control are introduced as follows:
First, the virus
Early spring eggplant eggplant often appear in the seedling stage, small leaves, dark green color, fine stalks, hair roots and other symptoms of stiff seedlings, such seedlings are slow seedlings after planting, weak growth, easy to drop flowers and fruit.
Causes of the disease: The seedbed temperature is too low (less than 15°C for a long time). The disease is most likely to occur. Water is used for heating facilities or for raising seedlings due to water consumption. If watering is not done in time, bed soil will be too dry.
Control methods: early spring quail eggplant nursery is at a low temperature, so temperature management is the most critical. First, use low-temperature-resistant varieties: such as Solanum oleracea 12 in Yuanfang, Yuanza No. 2 in long eggplant, and Shouguang Zichanga in long eggplant; followed by heating facilities, such as laying a floor heating wire, covering a small arch, two curtains, etc. Insulation facilities, timely watering, strengthen the management of temperature and moisture.
Second, falling, falling fruit, fallen leaves
After flowering, it will not fall off, and the lower part of the leaf will yellow and fall from the low temperature period, and the young eggplant will soften and fall during the high humidity period.
The cause of the disease is: the temperature is too low (below 15°C) or the night temperature is too high (higher than 20°C). Short-pillars are easy to form and generally do not produce normal results. In the absence of nitrogen fertilizer, plant growth will weaken, branching will be reduced, flower buds will be poorly developed, and short stupas will increase. When water and fertilizer are excessive, especially when the water is over-migrated, the watering and falling of fruits, especially the flowering, fruit dropping, and defoliation of the flower when the gate eggplant is blossoming; nitrogen and phosphorus fertilizers are applied. Excessive, the plant is aging due to long-term nutrient imbalance, so that the petiole and stem, stalk connecting place due to the lack of auxin formation from the layer off.
Prevention methods: In the early stage, strengthen the temperature management and take corresponding measures to increase the temperature. After watering the seedlings, control the seedlings with water until the door is open, then close the seedlings, start watering and fertilizing. When defoliation occurs, spray 700 times liquid zinc sulfate solution on the leaves or spray on the plants. Zinc nutrients (such as: Green Fung Po), can prevent the promotion of long-lasting, flowering results can also be used to plant growth regulators to spend fruit. For example, use 20- 30 ml/kg of 2,4-D to apply flower buds and pedicel upper ends, or spray flowers with 40-50 mg/kg of anti-dropping agents.
III.
Asparagus was shown to have a small fruit, a dull peel and a poor texture.
The cause of the disease: fruit enlargement period, in the case of low temperature and low light or high temperature and strong light easy to occur, when the fertilizer is too much, affect the absorption of potassium and boron, so that the fruit rigidity; flowering period, low temperature and low light, pollen development Bad, affect pollination and fertilization, easy to develop into a simple eggplant.
Control methods: Strengthen temperature and light management, clean the film in time to increase light transmittance, or hang light curtains indoors to increase light; Phosphorus fertilizers are mainly applied to the roots of seedlings when planting, and each time they are applied less at the late stage, avoid too much; During the result period, attention was paid to the application of potash fertilizer. Once there was an excessive amount of excessive phosphate fertilizer, potassium fertilizer and boron fertilizer (potassium sulfate, borax) were used to reduce the damage.
Four, double fruit
The double deformity of the fruit affects the appearance of the product but does not affect the quality.
Causes of morbidity: excessive fertilizer supply, excessive concentration of growth regulators, and appearance of carpel-like malformation.
Control methods: Strengthen temperature management at flowering stage, and appropriate amount of water and fertilizer. The concentration of growth regulator should be appropriately increased (at low temperature) or decreased (at high temperature) within the specified concentration range.
Five, crack eggplant, matt eggplant
Dehiscent, chapped, dull, poor quality.
The cause of the disease: the damage of the tea tree borer, which makes the skin thicker and rougher, while the internal placenta continues to develop, resulting in not long inside length; during fruit enlargement, the drought makes the peel hard, and then suddenly watering; late fruit development, The soil was dry and water was not available.
Control measures: Use Kezite, extermination manganese and other agents to control tea locust larvae. The results can not be short of water, even watering.
6. Withering of the parietal lobe
The stems of the plant were scuttled with wood and cracked, and the leaves were green-blue in color, with yellow edges at the edge of the coke, and the skin at the top of the fruit was concave, easily stained with blight and rotten fruit.
Cause of disease: alkaline soil, or from low temperature and low light period into high temperature and strong light, the transpiration increased above ground, but weak root absorption capacity, resulting in the top leaves due to lack of calcium, lack of boron and litter.
Control methods: Add calcium and boron fertilizers to the foliage, and pay attention to ventilation and temperature reduction in the high-temperature and strong light days, and spray and control the fungal agents such as Amixida and Thiophanate-methyl during the occurrence of M. blight.
Seven buds are not open
The ovary does not inflate and the buds do not open tightly.
Cause of disease: Boron deficiency.
Control methods: Spray 200 times borax aqueous solution or boron-containing trace fertilizer on leaves.
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