There are always various situations in the cornfield, such as the unearthed ears of the ears, the tassels are not scattered; the ears have been spun, the tassels have not been loosened; the parietal leaves are curled, the lateral bends; the corn smut, etc. What happened, what is the reason? How to deal with it? Let's take a look at it!
1. Herbicide phytotoxicity
2. The corn leaves caused by 4-D butyl ester or nicosulfuron are curled. If the phytotoxicity is light, the corn leaves will slowly expand after growing for a while, but if the leaves are oxtail-shaped, it is basically difficult to Expanded. So is it normal for this kind of plant that cannot be self-expanded? In fact, from July, there is a record of the development of phytotoxicity tracking on corn fields. On July 10, the corn plants are normally spun, and on July 21, the tassels are close to each other. The top leaves are exposed and scattered loosely, but the tassels are less branched and the tassels are smaller. However, there is a problem that if the proportion of seriously damaged plants is small, the normal pollination of the plants will not be affected. As for the size and yield of the damaged plants, it is necessary to wait until the autumn harvest.
In fact, the occurrence of herbicide phytotoxicity is caused by many factors, sometimes the weeds in the field, the growers increase the concentration in order to clean up at a time, sometimes due to residue, but also caused by drift, and then Spraying uniformity, instrument dripping, drug packaging throwing, repeated spraying, etc., is also caused by the dry and high temperature of the climate.
2. Curl caused by weather changes
Some varieties are more sensitive to climate change. If it is dry and wet formed by drought and rainfall, or the alternating heat and cold formed by high temperature and relatively low temperature will make the corn leaves curl. This curl generally occurs from the big bell period to the tassel period. This kind of situation mainly occurs in individual varieties. The lighter is only the top leaf curl and gently bends sideways. In severe cases, the parietal lobe is almost grounded and arched. In this case, we have been tracking. On July 21, the plants were completely erect, and the tassels began to loosen normally. The ears began to spin normally and did not affect normal flowering pollination. In addition, some varieties are sensitive to climate due to genetic reasons, and sometimes there are short-term leaf twisting and lateral bending. This situation usually develops naturally within a week, and does not affect normal flowering pollination, so there is no need to worry.
3. The process of change of silk smut
Corn smut mainly occurs in the spring-sown corn area, which is a disease in the early stage of seedling infection (generally before 5 leaves).
(1) Source of pathogen: Soil bacteria are also an important cause, and seeds can also carry bacteria and manure. However, seed coating is now practiced, and in general, the possibility of seedlings being seeded is relatively small.
(2) Variety is not resistant to disease: the occurrence of corn smut is related to the variety, and the resistance of the variety is the main cause of the disease.
(3) Climate and sowing time: Spring sowing area, early spring temperature, low temperature, when the seeding is early, the seeds can not be germinated and emerged, and the bacteria are infected in the soil with bacteria.
(4) Preventive measures: 1 Select the varieties that are resistant to head smut. 2 timely broadcast in time. 3 The main source of the bacteria in the soil is that the disease in the field has not been cleaned up in time, and it has not been cleaned before the bacteria mature. 4 Manure-bearing bacteria means that the cattle, sheep, etc. we have eaten have plants with serorrhosis, and the bacteria still survive after passing through the intestines, and finally return to the ground with the feces, so the diseased plants must be buried or burnt. If you don't, you can't raise cows, sheep, etc. 5 Be sure to choose coated seeds, and be sure to choose high quality coated seeds.
The above is about the occurrence of corn fields and preventive measures. In the process of corn planting, there will always be various problems. Therefore, if we want to ensure high yield of corn, we must have an understanding of various diseases. The above mainly introduced the corn herbicide phytotoxicity and corn leaf curl, as well as silk smut. Want to know more about corn planting, remember to pay more attention to the Huinong network school.
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