Summary of common pest and disease control methods for corn, collection and spare! Prevention and control of seedling diseases Corn root rot Corn root rot is a disease caused by Pythium. The main manifestation is that the mesoderm and the whole root system gradually become brown, soft and rot, and the root growth is seriously hindered; the plants are short, the leaves are yellow, and the seedlings die. In recent years, the damage of the pathogens in the roots of maize seedlings has increased. After the damage, the main roots are necrotic and the secondary roots are small, causing the plants to develop yellow. Control method: 1 The disease is mainly based on prevention, and it is better to coat with a bacteriocin suspension seed coating agent or a full-fledged gold seed coating agent before sowing; 2 Strengthening cultivation management after onset, spraying foliar fertilizer ; cultivating and damping the land with high humidity to promote root growth and development; 3 Severe plots can be used with 72% mancozeb cream, urethane cyanide wettable powder 600 times solution, or 58% mancozeb metalaxyl WP 1500 times liquid spray on the base of corn seedlings or roots. Corn top rot It is characterized by chlorosis, deformity, shrinkage or distortion of the upper leaves in the diseased seedlings; the edge tissue shows yellow streaks and knife-shaped nicks or leaf tips withered. Control method: In the early stage of the disease, 50% carbendazim WP, 80% mancozeb WP, 5% bactericidal water-clearing agent, 72% agricultural streptomycin soluble powder and other bactericidal agents can be used to spray the heart. The knife is cut longitudinally. Maize rough disease The rough disease occurs mostly in the 5-6 leaves of corn. The diseased seedlings are thick green, the internodes are shortened, the leaves are stiff, the width is short and thick, and the plants grow slowly and dwarf. Control method: Prevention is the main, no effective rescue measures after the onset: 1 Adopting comprehensive measures for planting disease-resistant or disease-resistant varieties, supplemented by agricultural control and chemical control; 2 seedlings were removed from the diseased seedlings and taken out of the field for deep burial treatment; 3 Add organic fertilizer, phosphorus and potassium fertilizer to improve the disease resistance of plants. Prevention and control of seedling pests July is still a high incidence of corn pests. The following six diseases are the most common, and the prevention and control methods must be mastered! 1, corn glutinous rice Corn borer, also known as corn borer, belongs to the order Lepidoptera, Coleoptera, and corn borer in China has two types: Asian corn borer and European corn borer. The more rain, the more corn borers will occur. Corn borer, commonly known as arrow worm and corn borer, is the most harmful pest of corn yield reduction. Control agent selection: 50% phoxim, 40% chlorpyrifos, a vitamin salt, etc., can be effectively prevented. 2, gray planthopper Laodelphax striatellus is the most important cause of the occurrence of rough disease, and the crude disease is also known as the "cancer" of corn. Therefore, many friends regard the control of gray planthopper as a top priority. The gray planthopper is generally 2.5-4 mm in length, the front wing is nearly transparent, and the sides are dark brown. Control agent selection: chlorpyrifos, imidacloprid, beta-cypermethrin can be. 3, Hummer Hummer likes warm and dry weather. The suitable temperature is 23 °C ~ 28 °C, suitable air humidity is 40% ~ 70%; humidity is too large to survive, when the humidity reaches 100%, the temperature reaches 31 °C, the nymph all die . The corn thrips are small, dark yellow, and the front wings are grayish yellow. They are relatively long but narrow, and the difference between them is still very large. Selection of control agents: Imidacloprid, fenvalerate, chlorpyrifos and imidacloprid can be selected. 4, armyworm The armyworm is an insect, which is Lepidoptera, Noctuidae. In China, except for Xinjiang, there are no reports, all over the place, the larvae eat leaves, when the big occurs, the leaves of the crops can be completely eaten, causing serious losses. The armyworm is well distinguished from the appearance, the head is reddish brown, the body color is from light green to dark black, and the body length is 17-20 mm, as shown in the above figure. It is very simple to control corn armyworms. There are also many kinds of pharmaceuticals on the market. Commonly used are 50% phoxim, 40% chlorpyrifos, and a vitamin salt. Many of the drugs are also cheaper. 5, two points of the night moth The genus Noctuidae is a new pest in the summer maize area of ​​China. It is often mistaken for the local tigers to be harmed if they are not controlled in time, which will seriously threaten corn production. The head of the two-pointed moth is brown, and the body is yellowish black to dark brown. Adults are 10-12 mm long, with black wings on the front and silver-gray on the hind wings. Selection of control agents: chlorpyrifos, acephate, and beta-cypermethrin can be used to control roots. 6, beet armyworm Beet armyworms lie in the lower part of the plant or in the soil during the day, and remove the food in the evening. It occurs 6 to 8 generations a year, and occurs in July and August. It has more high temperature and dry years, and is often mixed with Spodoptera litura. From the color point of view, there are many kinds, such as green, brown, pink, etc., it has a suspended animation, curled on the blade, people think that it has died, in fact, it is dead. Selection of control agents: It can be combined with armyworms and corn borers. Common drugs include phoxim, 40% chlorpyrifos, and carbaryl salts. The common pests and diseases of corn are actually easy to control. The medicine is also very common and very cheap. It can be done for a few dollars in an acre. Therefore, there are pests and diseases in the ground. It is terrible that you will not prevent it. What is more terrible is that you do not Go to prevention. (Source: Sannong Encyclopedia)
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