Corn rough disease medicine prevention three misunderstanding

Maize rough disease, year after year, the drug is not used less, the strength is not less, but still did not achieve good results, what is the cause? A large number of investigations have found that the main reason for this phenomenon is that there are some misunderstandings in terms of timing, timing and drug selection.

Occurrence and harm

Corn rough disease is a kind of viral disease caused by the transmission of poisonous insects such as scorpion, thrips, scorpion, and aphids. In recent years, there has been a tendency to increase the damage, which generally results in a 20%-30% reduction in production. Up to 60% or more, even overwhelming.

The crude virus overwinteres in winter wheat and other weed hosts, and can also survive winter in the poisonous insects. After the second year of corn was unearthed, the virus was transmitted to corn seedlings or sorghum, millet and weeds by means of poisonous insects. Maize is susceptible to disease before the 5-leaf stage, and the resistance is enhanced after the 10-leaf stage, even if it is affected by infection. If the corn emerges to the 5th leaf stage and meets the peak of the migratory insects, the incidence is serious, so the corn sowing period is closely related to the severity of the disease. For example, during the seedling period, the first generation of the larvae of the larvae were in serious condition; the disease was serious; the field management was extensive, the weeds were more, the ash hoppers were more, and the incidence was heavy.

Symptom diagnosis

Corn can be infected during the whole growth period, and it suffers the most from the seedling stage. In the corn 5-6 leaves can be obvious, heart leaves are not easy to extract and become smaller, can be used as a basis for early diagnosis. Beginning to produce transparent oil-immersed chlorotic dotted lines on both the base of the heart and the midrib, gradually expanding the entire blade. The leaves of the diseased plants are short and stiff, the leaves are dark green, the internodes are thick and short, and the parietal leaves are clustered like Clivia. The leaf veins of the leaf back, leaf sheath and eucalyptus leaves have waxy white strip-like protrusions of various thicknesses, which have obvious roughness. In the 9-10 leaf stage, the dwarfing phenomenon of the diseased plant is more obvious. The upper internodes are short and swollen, the top leaves are clustered, and the height of the diseased plants is less than half of that of the healthy plants. Most of them cannot be sturdy and the individual tassels can be extracted, but There are few branches, no pollen, abnormal ears, few filaments, severely dwarfed plants, degenerated tassels, deformed ears, and can not be strong in severe cases.

Get out of the wrong zone

When the disease prevention corn, especially the summer sowing corn, emerges, the wheat harvest is completed. At this time, a large number of poisonous insects will use the newly emerged corn as a concentrated feeding object. Therefore, the corn should be released or two leaves and one heart should be Spray and control the seedlings in time, spray the second time or even the third time after about 10 days. Many people do not know enough about this law. The timing of medication is late, and even when it is found that there are symptoms of contraction, the medication is started, which delays the optimal prevention time.

During the spraying time, the poisonous insects such as the gray locust, the hummer, and the jumping armor are flying and jumping. During the day, they are hidden in the soil, and they come out to eat in the evening. In the arrangement of spraying time, it should generally be held at 4 or 5 o'clock in the afternoon or in the evening. Some people ignore the living habits and activities of these pests, and take it for granted that they should spray the medicine during the morning break after the morning spray or work, which can not effectively kill the pests and affect the efficacy of the drug.

Drug selection should generally choose a combination of pyrethroid pesticides and organophosphorus pesticides, or other compound preparations with special effects, such as: insecticidal 18 seconds, sputum and so on. Some people choose pure pyrethroid pesticides, although they have the effects of contact and stomach toxicity, but lack of systemic action, resulting in a lot of poor effects of the above drugs. In order to better ensure the control effect, on the basis of the correct choice of insecticides, it is effective to add some plant vaccines that have the function of preventing and restoring corn rough disease and corn shrinkage.

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