Symptoms: Maize rough dwarfism can develop during the whole growth period of corn. Typical symptoms are dwarfing, shortening internodes, clustering of parietal leaves, dark green leaves, short and stiff leaves, and leaf veins on leaves and sheaths. Thick waxy white strips. Due to the different time of onset, the occurrence of plants and the resulting loss of yield are also different. The mildly diseased plants had poorly developed tassels and less loose powder.
[control methods]
1. Breeding and planting resistant varieties. General Hard-type than the horse tooth-shaped single-crossing disease resistance, inbred lines with high resistance, there are Ji 8, comprehensive 3, Zhonghuang 64, GY237, P12, P20, BS110, 138, 6513, E 1214.
2. Agricultural control measures: Compressing the area of ​​corn in intercropping wheat crops to prevent and control viral diseases in wheat fields and reduce the transfer of toxic sources to corn.
3 After sowing, weeds and weeds in the fields and fields are completely removed, and the diseased plants are removed by combining the seedlings and the fixed seedlings to reduce the source of poisons.
4 Rational fertilization, irrigation, strengthening of field management, and cultivating and weeding, to increase plant resistance to diseases.
5. Chemical control: seed dressing with insecticides, before and after the emergence of corn with 40% dimethoate emulsion or dichlorvos emulsion 1500 times spraying corn field and manure field 1 or 2 times; 30% acephate EC 80~150 ml, spray 60~75 liters of water; or use 20% to 3750 ml of 80% dichlorvos per hectare, add 5~10 times of water, and pour in 195~225 kg of fine sand (or fine soil) in several portions. With use, evenly spread into the field.
6. Maize seedling spraying poisonous virus, virus A or plant regulators such as gibberellin.
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