Zombie, also known as stone eggplant, is a parthenocarpic malformed fruit, which is the most common malformed eggplant in eggplant cultivation. The results of protected and open field cultivation are the most prone to the occurrence of deadlocks.
1 Symptoms
Its main symptom is that the fruit expands and stops after the eggplant is placed, and the top surface of the fruit is sunken. The fruit hardens and loses its edible value. In another case, although the solanaceous fruit can barely expand, the long-shaped fruit tends to become a round fruit, and the round fruit forms a "yin-yang fruit" because the half-face does not expand.
Most of the zucchini peels have no color or very light color. After cutting, we will see that the flesh is not real, there are more gaps, there is basically no seed in the flesh, and the seeds in the barely enlarged fruit are obviously less than the normal fruit.
2 Causes
Why is there a zombie? After years of research by researchers, it has been found that the emergence of scorpion is related to the cultivation of cultivars, seedling management, flowering management, the use of flowers and fruit-protecting drugs and the application of fertilizers. First, when the seedling stage encounters high temperature, high humidity, insufficient light, or unreasonable temperature at day and night, it will form inferior flowers with weak quality and short styles. This flower is easy to form a zombie.
Then there is the soil drought and water shortage, the temperature is low, the slow seedling is not good, and the plant is poorly fertile, which will also provide conditions for the occurrence of the dead eggplant.
Another reason for causing a zombie is that when the eggplant is exposed to temperatures below 17 degrees Celsius or above 35 degrees Celsius, the short stigma is formed, or the pollen tube is poorly elongated. Lead to pollination and fertilization is not complete.
In addition, improper use of time, concentration, and dosage of the flower-preserving fruit-care agent may also lead to the emergence of a zombie, so it should be sprayed according to the instructions for use.
Plant malnutrition, especially in the fruit expansion period, lack of nutrients, it is also prone to deadlocks. It is worth mentioning that the growers often have misunderstandings on this issue. They think that when the fruit is inflated and fertilized, the eggplant can grow long and good. In fact, too much fertilizer is also produced. One of the reasons, especially when the application of nitrogen and potassium fertilizers is too much, the plants will grow too vigorously, and the nutrients that are transported into the fruit will be insufficient, and the fruit will also occur.
The selection of varieties is also important in the cultivation of eggplants. Generally, short fruit-shaped varieties are more susceptible to the occurrence of deadlocks than long-fruited varieties.
3 Control measures
The key prevention and control measures are to ensure the temperature conditions during seedling raising, and the nursery temperature is preferably controlled at 25-28 degrees Celsius. When shed cultivation, the seedling stage should try to create light conditions that are conducive to the growth and development of eggplant. The general light intensity is preferably controlled at around 2000 lux.
The second is to control the temperature inside the shed after planting. The temperature in the shed is required to be between 20-30 degrees Celsius during the daytime, and the nighttime temperature is between 14-16 degrees Celsius. When the nighttime temperature is low, the cover is covered with straw coverings. Or heating measures to increase the temperature inside the shed; when the temperature is high on sunny days, the shed film is released in time, and the ventilation is increased to achieve a suitable temperature in the shed. Third, in addition to 20-30 kg of ammonium dihydrogen phosphate per acre, the boron and zinc trace elements should be sprayed once during the fruit expansion period.
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