In addition to the above-mentioned symptoms in the early stage of growth, the corn has suffered from dwarfing disease. The severe disease on the seedling stage will result in the death of the disease. Although the incidence of the disease may be mild, the incidence of spleen is small but the grain is rarely granulated, resulting in severe reduction in yield and even incomplete production. In the event of a corn rough dwarf disease, it is more difficult to prevent and control, and it is known as a plant cancer.
Maize rough dwarf disease is a viral disease transmitted by a poisonous planthopper. Laodelphax striatellus lived in various parts of corn and sucked sap, resulting in chlorosis and mosaic leaves. At the same time, it introduced the maize rough dwarf virus into the corn body, resulting in corn rough dwarf disease. The corn rough dwarf disease is seriously damaged by the wheat corn. The disease is most susceptible before the 5th leaf stage, and the disease resistance gradually increases after 10 leaves. Since the 5th leaf stage interplanting corn (mid-late and late 5 months) coincides with the peak period of the planthopper, the incidence is heavy. After the corn gets sick, the incubation period is 10-20 days, and the symptoms are obvious after jointing. This year, due to the heavy occurrence of SBPH in the South, there are a large number of SBPHs moving into our province. The local climate is characterized by low temperature, high humidity and long duration. The climatic conditions are suitable for the survival, reproduction, and damage of SBPH, most of the province. There have been fly-flyers in the area. Some maize seedlings that have been planted earlier have developed corn rough dwarf disease.
At present, specific prevention and control measures should be taken in light of the different hazards of local corn rough dwarf diseases. First, it is necessary to do a good seed coating agent for the autumn corn that is being sowed, and to control the planthopper as soon as possible after emergence. The second is to apply corn seedlings that have been planted and spray pesticides as soon as possible to prevent and control milkflies. The third is to combine seedlings and seedlings, remove diseased plants, and reduce the source of infection. Fourth, on the high incidence of land, under the guidance of technical staff, seize the time replanting or replanting soybeans and other crops, when replanting to select early-mature corn varieties, and implement seed coating.
The prevention of corn rough dwarf disease, Guan Jian is the prevention and control of poisoning insects - Laodelphax striatellus. Due to the small size of the insects and the hidden nature of the damage, the Smilax sphaerocarpus can be dispersed and prevented by the characteristics of airflow. The most effective measure is to seize the critical period of the past few days, to consolidate the time, and to concentrate spraying. Early prevention, general defense, and strong defense are used to achieve pest control and prevention. The control of Laodelphax striatellus can be used 5% Rui Jin special suspension 30ml or 10% imidacloprid 15g, spray 30-40 kg of water; also available 4.5% beta cypermethrin 30ml or 48% chlorpyrifos 60-80ml, 30-40 kg of water spray .
Spray control should pay attention to:
1. Pay attention to the spray of ridges, grounds, ditches, etc. to prevent the migration of sphaeroides outside the field to the fields.
2. When using fluconazole pesticides, avoid cruciferous vegetables such as cabbage and radish, otherwise it may cause phytotoxicity.
3. Avoid fish ponds, crab ponds, and apiary farms when using Protopor and Imidacloprid pesticides.
4, due to the recent high temperature, spraying should pay attention to protection, to avoid the occurrence of productive poisoning accidents.
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