First, the field symptoms and causes
1. The blade is curled into a cylindrical shape.
Mainly affected by climatic factors, about 5 to 6 leaves after emergence, due to large temperature difference between day and night, the leaf differentiation process is affected by low temperature, and the leaves are cylindrical after being extracted. This curl can be automatically unfolded in the later stage, and has no effect on late growth and yield.
2, the blade is upright like a whip
The main reason is the occurrence of herbicide phytotoxicity. When the medicine is sprayed, the medicine is not evenly diluted or sprayed unevenly, or the spray is repeated, or the movement speed is uneven or the spray is more at the head. For example, the symptoms of 2,4-D phytotoxicity are leaf curled with onion-like leaves, the stems are brittle and easy to fold, the leaves are dark green, the tassels are difficult to extract, and the aerial roots are deformed. In severe cases, the leaves are yellow and no ears; After the amine, the symptom of the phytotoxicity is that the corn heart is deformed and twisted into a whip-like seedling, and the stem is deformed and swollen. When the curl is slight, it can be automatically unfolded in the later stage, which will not have much impact on the yield. In severe cases, it will cause a large reduction in production. Most of the leaf rolling phenomenon that occurs today is caused by excessive use of herbicides or residues of herbicides.
3, the plant is short, the blade is stiff and rough
This situation is caused by a poisonous insect such as aphids, which causes viral diseases caused by biting leaves, leading to rough disease.
4, corn plants are divided into clusters
This situation is caused by the underground pests eating food. After the pests bite the growth point of the main stem, the growth point is inhibited by the injury or the external factors are affected, so that the dominant edge of the main stem is inhibited and bifurcation occurs. In this case, if only one branch is left, the spikelets can be formed; if it is allowed to grow, there is no yield.
5, corn silk smut
The symptoms of corn smut are more complicated in the field. The leaf curl in the upper part of corn is only one type of many symptoms, which usually occurs in mid-July. Some manifestations are that the top blade curls upright along the midrib side, and the tassel is deformed and enlarged, and there is black powder in the white film, and the leaves appear yellow and white stripes. Some show that the curl is loose, the tassel can be extracted, but the flower is deformed, the leaves have yellow stripes, and most of the cases have no yield.
6, the heart leaves can not be opened
This situation may be caused by the damage of corn thrips. When the leaves are spread by hand, it will be found that there are still corn thrips in the corn heart, and the insects are mostly active in the corn heart or young parts. The sucking mouth device punctures and stabs the leaves of plants, and presents silver-gray spots on the leaves. In severe cases, the corn heart leaves can not be opened or twisted, making it difficult for the heart leaves to grow, or the growth points are destroyed. The tillers are clustered, forming long heads of corn, and even destroying seeds.
Second, prevention and control technical measures
1. Corn plants with curly leaves in a tube shape
As the temperature rises at night and the lyrical field is flooded, it can gradually return to normal growth. Foliar fertilizer can also be sprayed on growing fields to promote growth.
2. The upper leaves are erect whip corn plants
Mild can gradually resume growth; heavier ones should be artificially spread the leaves, and then spray the foliar fertilizer. The key is to apply corn herbicides according to the specific conditions of soil quality, variety, precipitation, temperature, wind speed, etc., strictly control the application period, spraying time and dosage, and stir evenly. If phytotoxicity occurs, it should be based on specific conditions. Take appropriate remedial measures, such as irrigation, foliar spray, etc.
3, rough disease of corn plants
If it occurs earlier, it can not grow normally and is strong. It is best to remove it early. If it develops late, although it is blocked, it can still be strong (can be reduced by 30% to 40%). For the rough disease, it is mainly based on prevention. It is necessary to remove the weeds in the field frequently. The wheat and corn should be vigorously promoted to coat the seeds. In the wheat milk ripening period, that is, the aphid migration period, timely spraying and anti-lifting will eliminate the aphids. Before the migration, reduce the transmission of the drug, and organize the farmers to concentrate on the elimination during the prevention, otherwise the effect is not obvious.
4, the occurrence of tillering corn plants
If the main stem is seriously damaged, it should be removed as soon as possible; for the main stem to be normal, the tiller should be removed early. This situation is mainly based on prevention, and it is necessary to detect pests in the field. Weeds are the place where the pests lay eggs on the ground and are the mediators of the larvae transferring to the corn. Therefore, removing the weeds in the field before sowing can eliminate some larvae and eggs, and also eliminate the spawning place.
5, silk smut disease comprehensive prevention
Actively adopt agricultural measures to enhance the disease resistance of corn. If the density is increased appropriately, the quality of sowing is improved, and the diseased seedlings are removed early, and the cattle are not fed by the diseased plants to prevent the manure from being carried, and the harvested leaves and leaves are concentrated after harvesting. At the same time, the land is deep-turned in the autumn, and the winter water is poured in the winter to reduce the source of the bacteria. Speed ​​up the replacement of new varieties of disease-resistant varieties, and implement a large-scale rotation system.
6, corn thrips prevention measures
Seeds are coated with seeds. Fuliang 20% ​​thiamethoxam·20% cyanamide sulphate suspension seed coating agent, can also use gale (16% killing imidacloprid), kyphon (28% insecticidal acetamiprid), better control effect.
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