Tomato green fruit, its scientific name is gluten fruit, the specific symptoms are: browning or green skin on the surface of the fruit, individual fruit is brownish brown or hard necrotic spots, the fruit in the peel can be seen as "heart" The shape of the vascular vascular bundle is dark brown or brown, and the brown skin is often greenish or rusty. The flesh is hardened, the quality is poor, and it tastes unpalatable. Timely pesticide control is critical.
First, the cause of the disease: the disease is a physiological disease, the degree of damage depends on the variety and sunshine time and the intensity of light and the proportion of nitrogen, phosphorus and potassium in the soil, especially after a cloudy day, this disease is very likely to occur. In addition, the physical and chemical properties of the soil, the degree of application of human fecal urinary maturity also affect the occurrence and damage of the disease. Insufficient illumination, low temperature, high humidity, insufficient carbon dioxide, high night temperature, easy to guide the tomato green fruit, the lack of nutrients in the tomato body, the application of nitrogen fertilizer to the potassium fertilizer is not enough, especially when the ammonia nitrogen is too much, it will cause carbon water. The ratio of compound to nitrogen decreases, causing abnormal metabolism of the plant, leading to lignification of the vascular bundle and induction of rot. According to the pesticide network , the soil moisture is too large, the soil permeability is poor, hindering the absorption of the root system, causing the plant nutrient imbalance, so that the iron absorption is reduced, the incidence is heavy.
Second, the solution:
1. Selection of tomato varieties resistant to green fruit: At present, the varieties with thin fruit and thin leaves are more resistant to disease, and the thick skin is susceptible to disease.
2. Adding organic fertilizer and adopting formula fertilization technology, it is not appropriate to use ammonium fertilizer to adjust the ratio of nitrogen, phosphorus and potassium in the soil to promote the absorption and utilization of potassium by plants.
3, when there is a cloudy day after a cloudy day, you can not immediately remove the grass curtain. Half of the straw curtain should be uncovered first, and then all the straw curtains will be uncovered when the ground temperature reaches 15 degrees Celsius. This method prevents the occurrence of green fruit.
4, regular spraying of potassium dihydrogen phosphate or other foliar fertilizer, etc., can reduce the occurrence of green fruit to some extent.
5. According to the Chinese pesticide network , increasing the amount of carbon dioxide applied, using a light-transparent film to enhance the light, can also effectively reduce the occurrence of green fruit.
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