In the solar greenhouse, tomato grows in cloudy days, with weak light, low temperature, small temperature difference between day and night, and less photosynthetic products. In the event of a sudden sunny day, improper fertilization, improper watering, improper spray, lead to tomato cracking, empty fruit, and tendons. Sacrificial fruit, rot and rot fruit, malformed fruit. Its symptoms and preventive measures are as follows:
The main symptoms
1, cracking symptoms: (1) radial cracking. Gotti-centered, extending to the shoulder of the fruit, radiating deep and cracking, starting from the green ripening period of the fruit, resulting in fine streak cracking near the fruit pedicle, and obvious cracks 2 to 3 days before turning. (2) Ring cracks. The center of the fruit pedicle was a ring-shaped lobe, mostly appearing before the fruit matured. (3) stripe cracked fruit. Irregular strips crack at the top of the flower marks.
2, empty fruit symptoms: (1) poor placental dysplasia, the skin is very thin next to see the seeds. (2) The species with rapid growth of the pericarp and less ventricles, and the high inflorescence rate of the node are susceptible to disease. (3) Rapid development of pericarp, slow development of placenta formation of empty fruit.
3, symptoms of tendon rot: (1) browning type: seedling stage 1 to 2 ear fruit prone to occur, the fruit enlargement period, which appears local browning, diseased fruit vascular browning and necrosis, hardened fruit or fruit brown. (2) White variants. In the ripening period of green ripe fruit, the diseased fruit was unevenly colored, and the fruit surface of the placenta was green and convex. The diseased fruit flesh was “squeaky†and the vascular bundle was brick-brown and the flesh was hardened.
4. Symptoms of umbilical rot: Initially in the umbilicus of the young fruit, water-soaked spots appear, and afterwards, the dents in the top of the fruit are browned. The diameter is 1 to 2 cm, and when severe, it expands to a small half of the fruit. When the humidity is high in the late period, black moulds appear in the diseased part. The disease fruit is early red, and on one or two spikes, the fruit on the same inflorescence occurs almost simultaneously.
5, abnormal fruit symptoms: fruit spiking, malformation, multi-ventricular and other phenomena.
Prevention
1. Select varieties that are not likely to produce "strange fruits". The timely removal of fruit after fruiting occurs will benefit normal fruit development.
2, do a good job of control of temperature and light, to create a good temperature and light conditions for fruit development, when the nursery period meets cloudy and low light, the temperature should be appropriate during the day, the night temperature is controlled at about 17 °C, before and after the first spike inflorescence differentiation, to pass the tune Temperature, to avoid the emergence of low temperatures above 10 °C, flowering period to avoid high temperatures above 35 °C. In particular, after a long period of overcast days, the weather suddenly cleared up for a long time. Measures must be taken to avoid glare and high temperatures.
3, the rational use of growth regulators: when seedlings appear to be long, should be based on enhanced ventilation, appropriate temperature control, select the appropriate conditions under local conditions, the appropriate amount of growth regulators or suitable concentration of humic acid foliar fertilizer, flowering period Artificial pollination, and then spray a suitable amount of anti-dropping factor.
4. Control the soil moisture. After a long period of haze and sunshine, watering should be carried out at 9 to 12 o'clock on sunny days, and choose to pour water. The result period should pay attention to the balanced supply of water, keep the soil moist, avoid flooding, excessive dryness or excessive humidity.
5. Strengthen fertilizer and water management. Adopting formula fertilization technology, chasing calcium fertilizers out of roots, applying compound fertilizers of nitrogen, phosphorus and potassium, promoting root development, and making balanced growth of plant growth and reproductive growth. Adoption of biological fertilizers, organic fertilizers, and compound fertilizers in combination with topdressing it is good.
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