• Nwes

    How to distinguish wheat disease, freezing damage and pesticide damage? How to remedy it?

    There are generally three situations that cause wheat freezing damage:
    (1) After the wheat is planted, the temperature is high and lasts until the beginning of winter, and then suddenly drops in temperature, such as snowfall, rainfall, etc. Since wheat has not experienced cold temperature exercise after sowing, it is easy to cause freezing damage after the direct cooling.

    (2) It is different from the first one. In this case, long-term low-temperature weather is directly carried out. There are not many days with high temperatures on sunny days, which causes the wheat seedlings on the ground to wither and die, causing freezing damage.

    (3) This situation is after the new year, which is what we call the "spring cold". After the new year, the temperature began to warm up gradually. However, suddenly encountering a cold current, at this time the ability of wheat to resist severe cold declines, and there will be a big Freezing damage in the area caused dead seedlings.

    So how to prevent freezing damage and how to remedy it after freezing damage occurs?

    1. How to prevent freezing damage?
    The most effective way is to water frozen water. Watering it before overwintering can prevent freezing damage.

    After watering, the ground temperature will increase, and it can promote the development of root system and increase the vitality of wheat.

    Generally, weak-growing fields can be watered early, and strong-growing fields can be watered late.
    In addition, if the soil moisture is always good, you can choose not to pour it.

    2. What should I do after freezing damage to wheat?
    The main stalks, large tillers and small tillers are prone to freezing damage in wheat. Generally, the main stalks and large tillers are more severely damaged by freezing, and the small tillers are moderately lighter.

    In a plot with severe freezing damage, the main stem, large tiller and small tiller will all die. In this case, we must consider destroying the planting. You can plant other vegetables or wait for the next season.

    If the berberines are still alive, you can apply nitrogen fertilizer to promote the growth and development of the berberines. In addition, spray better foliar fertilizers to supplement total nutrition. In addition, appropriate potash fertilizer can also be topdressed.
    The main symptoms of virus disease are yellowing of leaves and dwarfing of plants. When the disease occurs after jointing, the leaves are chlorosis, the tips of the leaves appear bright yellow, the plants are slightly shorter or the diseased plants are severely dwarfed, and the tillers are clustered. Viral disease is a disease transmitted by a virus-transmitting vector. The main virus-transmitting insects are aphids, leafhoppers, and Laodelphax striatellus. Insects sip the leaf fluid of wheat seedlings and transmit viral diseases, affecting the normal growth of wheat. Once infected, it can cause severe yield reduction. , The earlier the infection is, the greater the impact on the yield. This disease spreads quickly and causes serious damage. It is difficult to control after being infected. Therefore, the prevention and control work should be done sooner rather than later. The comprehensive prevention and control of the disease should focus on prevention. The selection of disease-resistant varieties and the removal of weeds in the field are an important measure. Chemical control should be carried out with insect control as the main method, and the use of pesticides such as 600g/L imidacloprid suspension 40g+60g/L 10 grams of conazole suspending agent, seed dressing of 30-40 catties of wheat seeds, can prevent underground pests and at the same time control aphids, smut, total erosion, and sheath blight, increase the production of strong seedlings, and eliminate the virus transmission vector.

    After wheat is used, the leaf flesh is chlorotic, yellowed, deformed, and leaf tips are dry. Generally, the mild ones will resume normal growth after 10-15 days.

    The main reasons are:
    (1) Using contact herbicides such as carfentrazone, etc., causing chlorosis of wheat leaves; (2) The field humidity is low and too dry;
    (3) No secondary dilution or less than 30 kg of water per mu;
    (4) Overdose use or respray, etc.

    The phytotoxicity of wheat herbicides is mostly related to the irregular operation of the masses. Pesticide dealers are obliged to explain the basic situation of the use of wheat herbicides to the masses. The masses should actively learn how to use the herbicides in wheat fields. Understand the types of medications, be sure to operate in a standard manner, master medication time, medication temperature, water consumption, medication equipment, medication methods, and precautions to avoid drug damage.

    无码毛片视频一区二区本码,免费两性的视频网站,无遮挡全彩黄漫漫画大全集,特级毛片打开直接看
    <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <蜘蛛词>| <文本链> <文本链> <文本链> <文本链> <文本链> <文本链>