Maize seedling disease types and prevention
1, yellow leaf seedlings
1.1 symptoms at the beginning of the seedling leaves pale green, and then gradually yellow, severe leaves dead.
1.2 control methods
1 suitable time seedlings. Remove the seedlings, weak seedlings, diseased seedlings and field weeds when the four leaves of corn.
2 After nicotine seedlings, nitrogen fertilizer should be applied in a timely manner.
2, albino seedlings
2.1 Symptoms There are white streaks on the leaves and severe white leaves on the whole plant. The reason for this is the lack of zinc in the soil.
2.2 Control methods
For the seedlings with zinc deficiency, spray 0.4-0.6g of zinc sulfate and 100 kg of water per acre, and spray once every 7 days. The seedlings can be returned to normal only 2-3 times.
3, purple leaf seedlings
3.1 Symptoms The seedling sheaths change from green to red and finally to purple. They generally appear at the 3-leaf stage of the maize and are most pronounced at the 4-5 leaves. When severe, the stems and leaves are small and the leaves die.
3.2 Control methods
When purple seedlings appear in seedlings, they can be sprayed with 0.2% potassium dihydrogen phosphate for 1-2 times, usually every 7-10 days.
4, yellow green seedlings
4.1 Symptoms The leaves of the seedlings are narrow and narrow, and the plants are short in shape. The leaves appear yellow and green stripes. In severe cases, the leaves are brown, and finally they are scorched.
4.2 Control methods
1 Potassium fertilizer is added. If no potassium is available, plant ash can be supplemented.
2 For serious plots of potassium deficiency, seedlings can be sprayed with potassium dihydrogen phosphate, potassium chloride, potassium borate, and ash leaching solution at the 3rd leaf stage.
5. Maize dwarf mosaic disease
5.1 Symptoms Many ellipsoidal chlorotic dots appear in the stems and leaves of the plant, and then gradually develop along the veins into a dotted line, extending to the tip of the leaf. The leaves and veins gradually lose their green and turn yellow, while the veins on both sides remain green and form chlorosis stripes. In severe cases, the leaves turn green and dry.
5.2 control methods: 1 planting a good hybrid disease resistance. 2 Adjust the sowing date so that the seedlings will avoid the aphids to move and fly the bees. 3 Strengthen field management, timely cultivating and weeding, remove diseased plants, 4 pay attention to prevention and control of aphids and reduce incidence.
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