Cornfield herbicide types and methods of use

First, cornfield herbicide types

1. Soil-sealed herbicides: Most of these herbicides are sprayed onto the surface of the soil to form a soil layer. When the weeds germinate, they can be absorbed by roots, sprouts or hypocotyls to exert herbicidal action. Common herbicides of this type are acetochlor, atrazine, metolachlor, meperochlor, 2 methyl chloride and the like. Among them, some components have a control effect on newly emerged 1-2 leaf-age weeds, but as the grass age increases, the control effect will be reduced, such as atrazine, 2 methyl 4-chloro and the like.

2, stem and leaf treatment agent: This type of herbicide is after the emergence of weeds, the grass age is still small, generally before weed branching or tillering, spraying the liquid onto the surface of the weed stems or the surface, through contact and The absorption and conduction of the stems and roots of the weeds reached the growth point of the weeds and the rest did not pass the drug, causing the weeds to die. Stem and leaf treatment agents are divided into two categories according to their selectivity:

(1) Selective stem and leaf treatment agent: a herbicide that kills weeds and has little damage to crops. This herbicide can only kill certain types or weeds in the field, but has less impact on the crop. Most of the herbicides currently on the market, such as: mesotrione (namely, mesotrione), nicosulfuron, atrazine, bromoxynil, flurazepoxy, 2, 4D Ester and the like.

(2) Killer stem and leaf treatment agents: There are two main types, one is a conductive herbicide, which can be transmitted to various parts of the plant through stems and leaves, causing death, such as glyphosate. Rooting weeds have better control effects. The other is a contact-killing herbicide, the mechanism of action is to prevent chlorophyll synthesis, thereby preventing plant photosynthesis, such as paraquat, which has no effect on aged stems and leaves. Popularly speaking, see green killing, see green killing, see soil passivation, almost no residue of medicine.

Second, the use of corn commonly used herbicides

Acetochlor

Control of weed species: most annual grass weeds such as valerian, foxtail, crabgrass (glutinous glutinous rice), goosegrass (chicken grass), and some small-leaved weeds such as alfalfa and amaranth , duck yarrow, iron leeks, etc. have a good control effect.

Mechanism of action: Closed treatment, absorbed by plant shoots, seeds and roots can also absorb a part, but the amount is small. After absorption, it is transmitted to plants, inhibits the synthesis of proteases, and stops the growth of young shoots and young roots. If the previous sensation is good, the young shoots are killed without being unearthed. Poor sensation can also cause the stems and leaves of the unearthed weeds to absorb the soil liquid to the plant to play a role, causing weeds to die. Metolachlor and refined metolachlor are upgraded versions of acetochlor, which have similar mechanisms of action and better herbicidal efficacy and safety than acetochlor.

2,2,4-D butyl ester

Control weed species: 藜 (gray), 蓼 (such as Phyllostachys pubescens), 苋 苋 (苋菜), 葎草(剌剌秧), 荆荆(节节草), bitter leeks, 刺菜, 苍Broad-leaved weeds such as ear and field convolvulus are ineffective against grass weeds.

Mechanism of action: It has strong systemic conductivity. When the concentration is greater than 100ppm, it can hinder the growth of crops, interfere with the hormone balance in plants, destroy plant transduction tissues, inhibit light and action, and use non-grass weeds to die.

Usage: Before sowing, the amount of 72% 2,4-D butyl ester 30-50 ml can also be used in the 4-5 leaf stage of corn. The dosage is 20-30 ml. If mixed with nicotinic acid, Reduce the amount by half. Note on the use of 2,4D butyl ester: This ingredient is highly volatile and can drift in the air. Therefore, you should choose no wind or breeze when spraying, or wear a protective cover on the nozzle to prevent the agent from drifting to the dicot crop field. . The medicines using this ingredient must be cleaned or used exclusively. Currently 2,4D isooctyl ester is gradually replacing 2,4D butyl ester.

3. Nicosulfuron

Control weed species: can prevent horse tang (Valley scorpion), goosegrass (chicken stalk), foxtail, wild sorghum, sorghum, purslane, scorpion, scorpion, sedge, sedge, etc. For bowling flowers, Tianxuanhua also has certain control effects.

Mechanism of action: absorbed by the stems and roots of plants, rapidly transmitted through the xylem and phloem of plants, inhibiting plant acetolactate synthase, and hindering the synthesis of branched chain amino acids. After absorbing the liquid, it stops growing, the growth point is chlorotic and white, and it spreads to other stems and leaves, causing the plant to die.

Usage: Use 3-5 leaf stage of corn, 4% nicosulfuron acreage dosage 40-60ml. It should be noted that the sensitivity of this ingredient to different varieties is quite different. The order of safety is dent corn, hard corn, popcorn, sweet corn; because of sweet corn, popcorn, etc., it is sensitive to these drugs. It is forbidden to use; corn should not be used for planting; organic phosphorus pesticides should not be sprayed for 7 days before and after application of nicotinic acid; it is not suitable for application when the temperature is high or the humidity is high.

4. Atrazine (Atrazine)

Control of weed species: pre-emergence application has good control effect on unearthed annual broadleaf weeds and grass weeds. Post-emergence stem and leaf treatment is superior to grass weeds in annual broadleaf grasses.

Mechanism of action: Plant roots are mainly absorbed, stems and leaves are absorbed little, and conduction is rapid, which interferes with photosynthesis and causes weeds to die.

Usage: Before the seedlings, the dosage of 175-200ml per mu is treated, and the dosage of the stems and leaves after seedling treatment is 125-150ml. Need to pay attention: Atrazine has a long residual period, which has phytotoxicity to the later crops, and Atrazine has the characteristics of accumulated residue. In order to ensure safety, according to the characteristics of Atrazine, the method of mixing and reducing the amount is adopted.

5, mesotrione (mesotrione)

Control weed species: It can prevent annual broadleaf weeds, such as alfalfa, leeks, comfrey, ramie (wheel grass), Xanthium, etc., and annual grass weeds such as valerian, crabgrass, goosegrass , foxtail and so on.

Mechanism of action: It is absorbed by weeds, inhibits the activity of hydroxyphenylpyruvate deoxygenase in leaves, and causes plants to lose the protection of chlorophyll from ultraviolet radiation. The chlorophyll is destroyed, and the weed leaves are whitened and die.

Usage: After treatment of herbicides, the amount of spring corn 5% mesotrione is 80-120ml, and the amount of summer corn is 60-100ml. The safety of mesotrione is higher, and the spray can still be sprayed after the five-leaf corn, and the effect of killing grass on the larger broad-leaved grass is particularly good.

More pesticide knowledge, please pay attention to China Pesticide Network

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