Timely prevention and treatment of cotton seedling diseases Cotton seedling disease is an important disease of cotton seedlings. It can be diseased during the whole seedling period, and can cause symptoms such as rotting buds, rot, leaf blight, and stem rot. When it is severe, it results in lack of seedlings and ridges, and even destroys seedlings. . Diseases at the seedling stage are dominated by blight, anthrax, and red rot.
First, the main symptoms
1. Blight. Commonly known as rot disease, black root disease, cotton seedlings, after the victims, in the base of the stem near the ground produce yellow brown spots, then turned dark brown, and gradually sag rot, severe disease when the Ministry of thinning, diseased seedlings fall or withered .
2. Anthrax disease. After the onset of young stems, reddish-brown spindle-shaped streak develops, and then expands brownish, slightly concave, and longitudinally fissured. In severe cases, the diseased part turns black and the seedlings dry up. When the weather is wet, there are orange-red sticky substances on the lesions.
3. Red rot. After the onset of seedling roots, the root tip first decayed by yellowing brown, and gradually spread to the roots brown rot, and sometimes the diseased part was slightly enlarged, followed by dark brown dry, when the damp surface of the lesion produces a pink or pink white mold layer; The main features of the disease are the tender stems and radicles that are affected by the soil surface.
Second, the cause of the disease The occurrence of the disease is closely related to the climate, soil and other conditions, low temperature, high humidity is conducive to the occurrence of disease, so after the cotton sowing, if the case of low temperature and rain, or long duration of low temperature, soil moisture, The disease is serious. If the ground temperature rises or the soil moisture decreases, the disease ceases to develop. In addition, since most of the cotton in our province is planted year after year, the number of pathogenic bacteria in the ground has accumulated too much and the number of beneficial bacteria is too small, resulting in heavier disease. Early sowing, cotton fertilizer field with large amount of nitrogen fertilizer, seedling disease occurred.
Third, control methods 1. Agricultural control. After the rain is fine, the cotton seedlings should be treated with air-leaking roots to reduce the humidity of the roots of the cotton seedlings, increase the temperature of the ground, and reduce the occurrence of diseases. In areas with too much rain, it is recommended to take measures such as removing the film, dampening and protecting the seedlings after the weather is fine.
2. Chemical control. For the early onset and severely affected cotton fields, spray the roots and stems promptly. After the seedlings are in full bloom, in the event of low temperature and cold weather, spraying 500 to 800 times of carbendazim or thiophanate-methyl 800 to 1000 times to prevent and protect in time.
Disc Harrow,Rotary Harrow,Middle Duty Harrows,Atv Disc Harrow
Shandong Dahua Machinery Co.,Ltd , https://www.agrodahua.com