Corn is only a long stick no corn, what happened(二)?

The Pest hazard also is a question in corn.

Pest hazard

If the corn is damaged by aphids, corn borers, spider mites, spider mites, large-sized spotted diseases, smut, herbicides, etc., it can lead to premature senescence of the functional leaves, intrusion of the insects and insects, insufficient supply or obstruction of nutrients, often After the formation of empty spikes or after pollination, it is not possible to grout properly.

1. Red spider mainly harms the leaves, so that corn can not be used for normal photosynthesis, which seriously affects fruiting.

2. Aphids mainly harm the tassels, so that the tassels and small flowers lose their juice.

3. Corn borer mainly damages stems and leaves, ear, so that water, nutrient transmission is blocked, grouting is not true, plant premature aging.

4. Corn smut, sheath blight mainly damage the leaf sheath, leaves, in severe cases, the ear can not be silky and dry or rot, or even the whole plant withered.

5. Large corn, small spot disease mainly harms the leaves, in severe cases, damages the leaf sheath and the ear of the leaves, resulting in insufficient parental pollen and obstructed maternal silk, affecting corn seed production and pollination.

Precaution

Timely early sowing allows the corn pollination period to be advanced, avoiding hot weather, and allowing the corn to be pollinated at a suitable temperature.

Reasonable close planting according to the characteristics of corn varieties, reasonable close planting, is conducive to ventilation and light transmission, improve photosynthetic efficiency, increase ear nutrition, and promote ear differentiation.

Maize emasculation is appropriate to emasculation during corn tasseling, which weakens the apical dominance of maize plants, promotes ear development, assists artificial pollination, and increases pollination rate.

Reasonable irrigation can prevent the occurrence of "ka neck drought" in the big trumpet period of corn. If the drought is timely, watering in the big bell mouth period will promote the development of ear and promote the normal pollination and fertilization of corn.

Scientific fertilization adopts formula fertilization technology, and masters the principle of “applying sufficient base fertilizer, lightly applying seedling fertilizer, re-applying joint fertilizer and booting fertilizer, and skillfully applying seed fertilizer”. The base fertilizer is mainly organic fertilizer, and is applied with appropriate amount of nitrogen, phosphorus and potassium fertilizer. The topdressing is mainly based on nitrogen fertilizer, which is mainly carried out at jointing and booting stage, and the attacking fertilizer is properly applied in the later stage.

Strengthen the prevention and control of pests and diseases in the silking period of corn stalking, pay attention to the prevention and control of corn mites and mites, and the main chemical control is spray.

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