Every summer high temperature, vegetables will have different degrees of phytotoxicity for various reasons, resulting in reduced or even reduced vegetables, vegetable farmers are not wrong with these physiology, the pesticide network is small, and the summer high temperature is easy to trigger vegetable medicine. There are several major reasons for the harm, I hope that the friends of the vegetable farmers can start from prevention:
First, in order to prevent prolonged growth, excessive growth regulators use phytotoxicity to plant summer vegetables, the temperature in the shed is higher, especially in the case of high night temperatures, vegetables consume more nutrients, which is easy to cause prolongation. Affecting vegetable blossoms and fruit setting. Therefore, on the basis of ventilation cooling and shading and cooling, in order to adjust the balance between vegetative growth and reproductive growth of vegetables, many vegetable farmers have adopted the methods of spraying growth inhibitors such as auxin, chlormequat and paclobutrazol to regulate the growth of plants. However, in order to ensure the effect of controlling the wan, many vegetable farmers blindly increased the hormone concentration or repeated use of drugs, leading to hormone poisoning, affecting the growth of plants and fruits. Therefore, it should be used as far as possible according to the growth of the plant and the instructions, and should not be blindly applied.
Second, the prevention of disease caused by improper disease in the summer shed indoor temperature is higher, water evaporation is faster, therefore, vegetable farmers are more frequent watering, shed indoor humidity is too large, especially in continuous rainy weather, the shed indoor disease is very serious . In the process of disease prevention and control, some vegetable farmers have sprayed under high temperature and strong light at noon, and the concentration of the liquid is too large and the practice of frequent medication causes phytotoxicity. Therefore, we must grasp the amount of use, the right medicine, spray at the right time.
If it has already occurred, it should be remedied in time.
First, spray the water in time to wash the blades;
The second is to spray drugs to alleviate the phytotoxicity. If the spray of paclobutrazol is excessive, it can be relieved by mixing gibberellin with alizarin lactone. The effect of auxin and chlormequat on the fruit can be relieved by spraying with cytokinin. When herbicide phytotoxicity occurs on vegetable crops, it can be sprayed with Huifufeng active liquid fertilizer to alleviate the phytotoxicity. It can also spray 800 times liquid harvesting No.1 or 0.05% 920 solution, which can detoxify and repair damaged cells. . At the same time, it can be added with quick-acting nitrogen fertilizer such as urea to raise seedlings. The third is to strengthen the management of fertilizer and water, and spray 0.5% potassium dihydrogen phosphate and love more than 2 to 3 times to promote the rapid recovery of vegetable growth.
China Pesticide Network Tips for the best time to spray pesticides in summer
Spraying pesticides in summer, regardless of any crop, is best from 8 to 10 am and around 5 pm. Because about 9 am, the dew is dry and the temperature is not too high. It is the time when the sunrise pests feed and the activity is the strongest. At this time, the medication will not dilute the concentration of the liquid because of the dew, nor will it be due to the temperature. High decomposition of pesticides , reducing the efficacy of the drug, thus allowing pests to increase the chances of taking medicine and taking medicine. After 4 pm, the sun is westward, the light is getting weaker, and the night-borne pests are about to start activities. At this time, pesticides are sprayed, and the pests come out to eat or feed at dusk and night, and also have a high insecticidal rate. Many farmers like to spray pesticides at noon. They think that the temperature is high at noon and it is easy to kill pests. In fact, although the temperature is high at noon, the sun is strong, and the pests hide in the back surface, and even stop the activity, the drug is easy to decompose, so the insecticidal effect is poor. In addition, due to the rapid evaporation of the noon liquid, the human inhalation is large, and it is easy to cause poisoning.
There must be rules in accordance with the instructions for the application of drugs, beware of the occurrence of phytotoxicity
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