Acetochlor seals weed control

Before corn seed germination, corn sprout poisoning is bent, serious deformation, can not be excavated, resulting in lack of seedlings;

When corn emerged, it suffered from acetochlor injury, tooth poisoning, and a stiff cone, which caused the new leaf to fail to grow normally. Some of them died of dryness, and some of them did not disintegrate until the dry cracked tooth appeared. Causes small sticks or empty stalks.

It is worth noting that the acetochlor injury is not the same as the 2,4 D butyl ester injury. Under normal circumstances, the phytotoxicity that occurs in corn seedling stage is caused by acetochlor, and the 2,4 D butyl ester phytotoxicity symptoms generally appear after 5 to 6 leaves of corn. One of the more obvious features is that the heart leaves are oxtailed. , commonly known as "cow tail seedlings."

The causes of acetochlor injury are as follows:

First, the amount of medication is too large. In practical production, the amount of acetochlor is increased year by year, from the initial 50% of EC to 111 ml/mu, to 167 ml/mu, and to 90% of the later 167 ml/mu, to the present 400-450 ml/ mu. With the increase in the amount of medication, the occurrence of phytotoxicity also gradually increased.

The second is that the amount of water is too small. Acetochlor uses 30 to 45 kilograms of water per mu, but in actual production, growers like to increase the dose rather than increase the amount of water used. In the final analysis, the drug dose was too large, resulting in the emergence of acetochlor.

Third, it was wrong during the fight. Many growers wait for the rain after the sowing of the corn. At this time, the corn seed is or has germinated and is prone to phytotoxicity. Before weeding, weeding should be sprayed as soon as corn is sown.

Fourth, there is no local application of pesticides. Generally, soils with better soil conditions can have larger doses, and land with poor soil conditions can reduce the amount of pesticides used. If the soil in poorly-ground plots is too large, phytotoxicity can easily occur. This is the case for a piece of phytotoxicity in a common plot.

The fifth is excessive rainfall after fighting drugs. After the application of acetochlor, the soil moisture is not good, and there is little rainfall or precipitation, so the weeding effect must not be good. If the precipitation is sufficient, a good sealing layer will be formed and the weeding effect will be very good. If the precipitation is too large, phytotoxicity will occur because the liquid will sink with the water, causing corn seed to absorb excessive herbicides and produce symptoms of poisoning.

Sixth, the product is inferior. The regular manufacturers of acetochlor have advanced technology, good choice of additives, good filming effect, long persistence, and are easily degraded by the soil, and have no impact on the crops. If it is fake and shoddy products, it is very It is prone to phytotoxicity.

How to prevent acetochlor damage?

Do not wait for the rain to apply pesticides, and do not use postemergence pesticides.

Learn to apply the medicine locally, add enough water, and increase the effectiveness of the seal.

When sowing, try to avoid the existence of depressions, so as not to produce water, resulting in phytotoxicity.

Use mechanical spraying and spray evenly to ensure adequate water volume.

Acetochlor remedy measures:

Lighter damage (about 10% of the land mass damage), can not be treated; slightly serious (20% to 40% of the phytodamage occurred), timely replant; very serious (more than 50% of the land phytotoxicity), To destroy germs in time.