What drugs are used to prevent and control corn yellow leaf disease, and what drugs are used to prev

Yellow leaves are not necessarily disease, may be fertilizer, may be pesticide damage, need to judge whether it is old leaves or new leaves yellow, into pieces or into rows or pieces of independent, and then look at the root system. Recently, there has been a lot of rot at the base of the stem, probably due to the root system, if not, look at the yellow leaves, the spots are still lumpy. It is best to see the picture above, the leaves and roots, and the whole field.

Yellow leaf disease occurred in corn, and it can be used to clear the ditch and drain the rain"Carbendazim", or"Dixon", plus"Amino acids and trace elements"Water liquid fertilizer,"Brassinolide", mixed for spraying. Dosage per mu:"Carbendazim"100 200 grams, or"Dixon"50 ml,"Brassinolide"4 6 grams, spray corn with 60 kg of water, once every 10 days and a half months, spray two to three times in a row, you can ** corn yellow leaf disease, so that corn yellow leaves turn green and resume growth.

In the early stage of the disease, you can choose 30% Ningnanmycin tebuconazole suspension, 30% hexaconazole suspension or 10% difenoconazole water dispersible granules 1000 1500 times, or 50% iprodione wettable powder, 25% propiconazole emulsion 500 1000 times solution, or 40% mycloconazole water dispersible granules 5000 6000 times liquid evenly sprayed, with a dosage of 40 50 kg per mu, which can also treat a variety of leaf diseases such as corn large and small spots, rust and Curvularia leaf spot. Spray once every 7 days, spray 2 3 times in a row, and spray in time after rain within 6 hours after spraying.

Plant insecticides should be used in a timely manner, evenly sprayed on plant leaves, and watering should not be done during the medication, otherwise there is no effect, and it can be consolidated several times.

There are many reasons for the yellow leaves of corn, which may be caused by zinc deficiency, and an appropriate amount of zinc fertilizer can be added to control when applying basal fertilizer; It may also be caused by insect pests at the seedling stage, mainly cotton bollworm, needleworm, aphid, armyworm, thrips, Swedish pole fly, etc., which need to be prescribed, such as armyworm, 50% phosphine concentrate or 50% methamidophos EC can be sprayed 1000 times for control; It can also be caused by insufficient watering, so you can water it once after sowing to keep the soil moist.

2) Flupyranone: It is also one of the effective pesticides for corn yellow leaf disease, with a dosage of 300-600 grams per hectare. (3) Carbendazim:

When using pesticides, they should be used in accordance with the usage and dosage of the drug instructions to avoid excessive use or misuse. 2.When using pesticides, attention should be paid to the safety of use to avoid harm to the environment and the human body.

3.In order to avoid the occurrence of pesticide damage and diseases, field management should be strengthened, diseased leaves and plants should be cleaned regularly, and the field environment should be kept clean and hygienic.

Causes and control methods of corn yellow leaves 1, brown spot corn yellow leaves are infected with brown spot disease, the disease mostly occurs in corn leaves, leaf sheaths and stems, first appear at the tip of the top leaves, initially yellow-brown or reddish-brown small spots, severe leaves are all covered with lesions, resulting in the death of seedlings. 2. Seedling blight corn is susceptible to seedling blight during the growth period, especially in the seedling period, the base of the leaves gradually withers yellow, and the phenomenon of drying out, and the corn leaves are completely dried up in the later stage of infection, and the whole plant presents a dead state. 3. Heavy fertilization water for yellow leaf corn to adopt five-stage topdressing management, that is, topdressing fertilizer, small bell fertilizer, large bell mouth fertilizer, ear fertilizer, grain fertilizer, fertilization implementation of a small number of times, to improve fertilizer efficiency, seedling stage per mu of urea 10 kg, potassium sulfate 5 kg, enhance disease resistance.

4. Spraying agent In the early stage of corn disease, you can choose 30% Ningnanmycin tebuconazole suspension and 25% propiconazole emulsion 500-1000 times liquid for spraying, spray once every 7 days, and spray 2-3 times in a row to alleviate the phenomenon of corn yellow leaves.

Summary. Hello, glad to answer for you; There are many reasons for the yellow leaves of corn, which may be caused by zinc deficiency, and an appropriate amount of zinc fertilizer can be added to prevent and control when applying basal fertilizer; It may also be caused by insect pests at the seedling stage, mainly cotton bollworm, needleworm, aphid, armyworm, thrips, Swedish pole fly, etc., which need to be prescribed, such as armyworm, 50% phosphine concentrate or 50% methamidophos EC can be sprayed 1000 times for control; It can also be caused by insufficient watering, so you can water it once after sowing to keep the soil moist.

Good. Hello, glad to answer for you; There are many reasons for the yellow leaves of corn, which may be caused by zinc deficiency, and an appropriate amount of zinc fertilizer can be added to prevent and control when applying basal fertilizer; It may also be caused by insect pests at the seedling stage, mainly including cotton bollworm, needleworm, aphid lemmeryth, armyworm, thrips, Swedish pole fly, etc., which need to be treated with the right medicine, such as armyworm, 50% phosphine octathion EC or 50% methamidophos EC can be sprayed 1000 times for control; It can also be caused by insufficient watering, and can be watered once after sowing to keep the soil moist.

Seedlings with yellow leaves, not zinc deficiency.

Not zinc deficiency. Yellow leaves of seedlings.

It should be a disease.

Hello, glad to answer for you; "Pro, spray or irrigate the roots at the base of the corn seedling stem with 500-1000 times of 40% phoxanthion EC or other systemic insecticidal residues in a timely manner. For other insect pests, you can use general high-efficiency and low-toxicity insecticides

It should be a bacterial disease.

Hello, I'm glad to answer for you; 1.After the emergence of seedlings, if there is a long-term low temperature or rainy weather, corn seedling blight is very likely to occur. Seedling blight generally begins to onset in the 2-3 leaf stage, after the onset of the seedling leaves appear yellow and dry, the edges are scorched, and the leaves gradually turn yellow and dry from bottom to top.

Note: In the early stage of the disease, the base of corn was sprayed with chlorethazine + foliar fertilizer, and the control and nutrition were carried out at the same time. 2.The main insect pests at the seedling stage of corn are cotton bollworm, needleworm, aphid, armyworm, thrips, underground pests, and mealybugs.

Among them, nymphs and female adults are concentrated in the base, roots and leaf sheath of corn seedlings near the surface to absorb the juice, causing the leaf sheath of the damaged corn to turn yellow and dry up first. Spray or irrigate the roots of corn seedlings at the base of the stem with 500-1000 times of 40% phoxanthion EC or other systemic insecticides in a timely manner. For other insect pests, general high-efficiency and low-toxicity insecticides can be used.

Summary. Hello dear, 1Corn deficiency problem Corn seedling deficiency can easily lead to yellowing, such as nitrogen deficiency, iron, zinc, manganese, magnesium, etc., which will cause different symptoms of yellow leaves.

Nitrogen deficiency: The lower leaves are yellow first, and urea can be sprayed or nitrogen fertilizer can be sprinkled and applied in rainy days. Iron deficiency:

The new leaves appear yellow first. Ferrous sulfate or 0....2.

When the seeds are sown too deeply, the seeds are not easy to germinate, and the root growth of the seedlings is affected, which affects the absorption of nutrients and causes the leaves to appear yellow. When sowing, the depth should be controlled.

Hello. What is the reason why my corn seedlings have yellow leaves and purple stems?

Hello dear, 1Corn deficiency Deficiency Corn seedling deficiency can easily lead to yellowing, such as nitrogen deficiency, iron swimming, zinc, manganese, magnesium, etc., which will cause different symptoms of yellow leaves. Nitrogen deficiency:

The lower leaves turn yellow first, and urea can be sprayed or nitrogen fertilizer can be sprinkled and applied in rainy days. Iron deficiency: new leaves appear first and the tomato pins turn yellow.

Ferrous sulfate or 0....2.When the seeds are sown too deeply, the seeds are not easy to germinate, and the root growth of the seedlings is affected, which affects the absorption of nutrients and causes the leaves to appear yellow.

When sowing, the depth should be controlled.

At first, it was green, but suddenly it turned yellow, and I wanted to take the wrong kind of medicine.

Resemble. Hello dear, it may be the lack of those substances, oh dear.

So how to solve it? What medicines do I need to buy?

Hello dear, nitrogen deficiency: the lower type of stupid leaves are yellow first, you can spray urea or take advantage of the rain to sprinkle and apply nitrogen fertilizer. Iron deficiency:

The new leaves appear yellow first. Ferrous sulfate or iron amino acids can be sprayed. Brief zinc deficiency:

The young leaves appear pale yellow to white and can be sprayed with zinc sulfate. Manganese deficiency: The veins of young leaves turn yellow, forming yellow-green stripes, and the leaves are curved downward.

Foliar sprays of sulfate can be applied to manganese solution. Magnesium deficiency: The upper leaves of the seedlings are yellow, and yellow and white stripes appear between the leaf veins, and the foliar spray of magnesium sulfate solution can be used.

Generally, 50-75L per mu is sprayed, sprayed 1-2 times, and the interval is at least 7 days.