It is understood that before the emergence of the corn to the male, the heart leaf distortion may occur at different leaf ages, resulting in the twist of the corn heart, for the following two reasons:
Improper use of herbicides
First, under high temperature conditions, or the dose is too large, or repeated spraying to cause phytotoxicity. Second, pre-emergence herbicides (such as acetochlor, metolachlor and other amide herbicides) can cause young leaves to shrink and twist, can not fully expand, form D-type seedlings, plant dwarf, developmental deformity; post-emergence weeding If the agent is over 5 years old, the liquid can not be sprayed into the heart. If the liquid is accumulated in the heart leaf, it will cause distortion, whitening or rotten leaves, and the plant will be dwarfed. Third, when the herbicide is applied too late, the corn will produce the phytotoxicity of the onion tubular leaves, mainly because some hybrid varieties are sensitive to the agent, and this symptom occurs, resulting in the young ears not being able to be extracted normally.
Control method:
1. Try to avoid medication during high temperature.
2. When the phytotoxicity phenomenon is light, it is necessary to timely topdress and water, which can alleviate the phytotoxicity; when the phytotoxicity is serious, it can be artificially assisted to pick up the heart of the parcel or spray the plant nutrients containing potassium nitrate and zinc sulfate to relieve Drug damage.
3. Proper medication to prevent medicinal damage caused by too late.
Corn thrips
Corn is often damaged by thrips in the 3-5 leaf stage. The heart of the damaged corn is twisted, the leaves are damaged and shrunk, and the holes appear on the leaves. The front of the leaf has a transparent film, some of the heart leaves have mucus, and some of the heart leaves have been broken and a large number of thrips are visible.
Control method:
1.10% imidacloprid 1000 times solution or 5% acetamiprid 1500 times solution plus agricultural streptomycin 500-800 times solution, plus some gibberellin or high-efficiency foliar fertilizer, spray again after 5-7 days, even spray 2 times. The focus is on the heart leaf and the back of the leaf.
2. Severely deformed plants should be artificially dissected to twist the heart.
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