What should be paid attention to in each period from sowing to harvest of corn? What kind of medicine should be used for diseases and insect pests?

It is the spring ploughing season to prepare for the crop seeds to be sown. What the editor introduces to you today is what should be paid attention to during the period from sowing to harvest of corn. What kind of medicine should be used for diseases and insect pests? Let's take a look.

March to mid-early April: preparation period before broadcast

The main measures to prevent all kinds of diseases and insect pests during the whole growth period are as follows:

1. Soil treatment

Soil treatment should be carried out in areas with serious underground pests. The method is: 5% phoxim granules 45kg per hectare.

two。 Agricultural prevention and control

Remove weeds in fields and fields and reduce the source of the virus. Before corn sowing, the fields with more weeds can be sprayed with biotic herbicides.

From mid-late April to mid-May: sowing time of spring corn

The main control targets are underground pests, smut, seedling wilt, bacterial wilt, virus diseases and weeds.

1. Seed treatment

To control underground pests, head smut, seedling wilt and bacterial wilt, seeds can be mixed with appropriate amount of phoxim plus 3% difenoconazole seed coating agent (or tebuconazole, 20% triadimefon, 34% wilt, etc.). Seed dressing with long-acting internal inhalation insecticides should be used in areas with serious rough shrinkage disease and mosaic virus disease.

two。 Chemical weeding

(1) herbicides for stem and leaf treatment.

In the selection and collocation of herbicides, atrazine is the main herbicide, with an appropriate amount of Acetochlor and other herbicides. The suitable dosage of herbicides is 40% atrazine 100g/ mu, 48%, 72% Metolachlor 100mL/ mu, or 50% Acetochlor 75~100mL/ mu. For plots with older grass, glyphosate or glyphosate 200mL/ mu can be added. The herbicides of the above doses were mixed with 60kg in clear water, and then sprayed on the ground in front of the seedlings to seal the soil.

(2) soil closure and weeding before seedling after sowing.

Acetochlor, Metolachlor and other herbicides are used in ① corn fields, which are mainly composed of Gramineae weeds.

Corn fields dominated by broad-leaved weeds in ② were treated with atrazine, azosulfonamide, 2mae4-murine D-butyl ester, Acetochlor, Metolachlor and so on.

The corn field of ③ mixed with Gramineae and broadleaf grass was sprayed with atrazine, Metatrazine, Metolachlor, thiophenesulfuron, Acetochlor, Acetochlor, Metalachlor, Metformin, atrazine, simazine and so on. The time of pesticide application should be carried out while it is wet after sowing and watering the head water, or increase or decrease the amount of water according to the level of soil water content.

From late May to mid-June:

Spring maize seedling stage to jointing stage and summer corn sowing stage

Spring corn mainly controls ground tigers, leaf-eating pests, corn borer, brown spot and so on, while summer corn mainly controls underground pests, smut, seedling blight and virus.

1. Ground tiger

It can be controlled by light trap, artificial capture or trichlorfon poison bait.

two。 Leaf-eating pests

Leaf-eating pests such as armyworm, beet armyworm, cotton bollworm and lamp moth can be controlled by acephate, flurosemide, diflubenzuron, cypermethrin and so on.

3. Corn borer

Heart loss prevention and treatment with phoxim and acephate granules.

4. Brown spot disease

Triazole fungicides such as triadimefon, diniconazole and propiconazole were sprayed for prevention and treatment.

July: from booting to heading and filling stage of spring corn

Jointing stage to booting stage of summer maize

The main control objects of spring corn are tumor smut, leaf spot, armyworm, red spider, corn borer and so on. Summer corn is a kind of ground tiger, leaf-eating pest, corn borer, brown spot and so on.

1. Powdery mildew, leaf spot

It can be prevented and treated with 10% triadimefon wettable powder and 12.5% uniconazole wettable powder.

two。 Armyworm

It can be controlled with 2.5% deltamethrin EC and 90% trichlorfon crystal.

3. Red spider

1.8% avermectin EC, 73% acetylene paracetamite EC, 15% paraben EC and other agents.

4. Corn borer

Bacillus thuringiensis wettable powder, 3% phoxim granules, 30% acephate EC and other agents for prevention and control.

5. Weeds

In view of the weed germination in the middle and later stage of corn growth caused by various reasons, glyphosate and sulfosulfuron can be selected for directional spraying between rows of corn, and the sprinkler should be equipped with a protective cover to avoid drug damage caused by spatter on corn plants.

August: from grain filling to maturity of spring corn

From heading to filling stage of summer corn

Spring corn is mainly against leaf spot, corn borer, aphids and so on, while summer corn is against tumor smut, leaf spot, armyworm, red spider, corn borer and so on. Aphids can be sprayed with imidacloprid, acetamiprid EC, dimethoate or pyrethroid, and other pest control agents are the same as above.