In 2014, it is expected that spring maize seedlings and brown spot disease will occur in Beijing. Moderate occurrence of susceptible varieties occurs; moderate occurrence of underground pests; moderate occurrence of corn borers and borers; moderate occurrence of weeds in corn fields; Occurrence, prevention and control situation is more severe. At present, it is necessary to focus on the trend of occurrence of diseases, weeds and weeds this year, highlight key technologies, and vigorously promote professional and unified prevention and green prevention and control of pests and diseases. The specific measures are as follows:
Select resistant varieties
For diseases such as large- and small-spot disease of spring maize, which are more common, it is recommended that when varieties are selected, according to the local production reality, the varieties with strong disease resistance and good yield should be selected, and at the same time, attention should be paid to varieties. Reasonable layout, strengthen fertilizer and water management, and improve plant resistance to disease.
Do seed coating
Spring sowing of corn seed coating is an effective way to reduce pests and diseases in the whole growth period. It can be coated with 5.4% pyrazolone corn seed coating agent to control the seedlings of Laodelphax striatellus, aphids, thrips, and dwarfism. The use of tebuconazole, thiram, powder embroidered and other seed dressings can reduce the incidence of corn head smut; use phoxim, Gao Qiao seed dressing, to prevent underground tigers, wireworms and other underground pests.
Weed control
The control of weeds in spring sowing corn field must seize the two critical periods before and after seedlings, so as to prevent early eradication.
Pre-emergence soil closure: When the soil is moist before emergence, the corn is “closed†and weeded. The soil sealing treatment agent can be 38% atrazine (atrazine) suspension 100 ml + 50% acetochlor EC 100 ml, if the field head has green weeds when sowing, can mix appropriate amount of glyphosate or paraquat , watered 40 kg, evenly sprayed. When the soil is closed, do not re-spray, no leakage spray, with the principle of the surface of the soil moist, conducive to the formation of the film to achieve the role of closed ground.
Post-emergence stem and leaf treatment: For the plots with poor weed control before sowing, weeds can be postemerged from the shoots and leaves of corn, which can be used in the 4-6 leaf stage of maize and 2-3 leaf stage of weeds. To Tianjin (Atrazine) suspension agent 70 ml + 4% Nicosulfuron (Yu Nong Le) Suspension 40 ml, watered 40 kg, evenly spray.
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