How to prevent corn rough dwarf
ã€symptom】
Maize rough dwarf disease can develop in the whole growth period of corn. The typical symptoms are dwarfing plants, shortening internodes, clustering of parietal leaves, dark green leaves, short and stiff leaves, and uneven thickness in leaf and leaf sheath veins. 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: Compress the area of ​​intercropping corn in wheat fields, prevent and control virus disease in wheat fields, and reduce the transfer of toxic sources to corn.
3, after sowing, completely remove the field, grassland weeds, combined with thinning, Dingmiao remove diseased plants, reduce the source of poison.
4. Rational fertilization, irrigation, strengthening of field management, and cultivating and weeding to improve plant disease resistance.
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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