Gramineae corn leaves have yellow spots what is going on? How? How do you produce high yields?

Corn is one of the more common cash crops in our country, and it is planted in almost every area, but during the planting period, we often encounter all kinds of diseases and insect pests, and among all the diseases and insect pests, macula on leaves is the most common. How is there macula on corn leaves? How to solve it? How to grow high yield?

Yellow spot on corn leaves is rust, a very common disease in the process of corn growth, basically as long as it is planted in the area of corn, or light or heavy, all occur, in general, the disease begins in the middle and later stages of corn growth.

Corn rust is a kind of climatic infectious disease, which mainly harms the leaves of corn. If it is not prevented in time, the ears of corn will also be invaded. Judging from the appearance, everyone has seen rusty things in daily life. The characteristics of corn rust are similar to rust, so it is called rust. It will produce a lot of yellowish spots on the leaves. If you touch it with your hands, you will feel a bulge and rub it a little hard. Rust-colored powder will be scattered, and if it is not prevented in time, some of these yellow spots will turn black in the later stage, endangering corn production. Statistics show that corn rust occurs in moderate plots, reducing production by about 20%. Serious plots can reduce production by more than half, of course, the most serious is the failure of harvest (small helpers do not want this to happen).

The cause of rust:

There are many reasons, which can be divided into internal and external causes. the internal cause is the problem of varieties. Some varieties have weak disease resistance and are easy to be infected with diseases. For such varieties, we should give up and stop choosing. In terms of external causes, there are more common high-temperature and humid weather. For example, in the middle and later stages of corn growth, there are more overcast and rainy days, so there is a high probability of corn rust (similar to iron rust, but it is easy to rust after meeting water. Although the principle is different, but it means this, as long as you can understand it), for example, when the light is insufficient, the incidence of rust will also increase. This is also easy to understand.

Solution:

In fact, corn rust is also very easy to prevent and control, however, since it is a disease, it is still based on prevention, first of all, when buying seeds, we should buy strong disease resistance, and then pay attention to field management, such as planting density should not be too high, pay attention to the control of weeds in the field, reduce the occurrence of germs, and pay attention to weather changes, the field should not be too wet, after rain, timely drainage, no stagnant water, finally It is the problem of control medicine. in the case of unable to prevent, rust has occurred in the field, and the commonly used agents that can be selected are phenylpropiconazole, tebuconazole, thiofuramide and so on.

How to grow high yield?

1. Sowing seeds at the right time

The suitable sowing time of summer corn is the first and middle of June. Corn can be sown on the same day or the next day after wheat harvest. It is advocated to harvest wheat in front and sow corn behind to realize the "through-train" operation of wheat machine harvesting straw chopping and returning to the field, corn machinery precision sowing and deep application of chemical fertilizer. The sowing date of summer corn in the land with rough dwarf disease occurred year after year can be postponed to June 10 to June 15, and the seriously diseased land can be sown after 15 days.

2. Sowing depth

The sowing depth depends on the soil texture and soil moisture, which is generally 4cm. If the soil is heavy or the soil water content is high, it should be sown shallowly. The thickness of the cover soil is 2cm. If the soil moisture is insufficient, the depth should be 5cm. The thickness of the soil cover is 6cm.

3. Sowing density

Reasonable close planting should be achieved according to production conditions, climatic conditions, soil fertility, management level and use. The recommended planting density of grain in field is 4000-4400 plants / mu, and that of silage is 4400-4800 plants / mu. In addition to planting with equal row spacing of 60 cm and 65 cm, it can also be planted with rows of 40 cm-80 cm or wide rows of more than 75 cm, which is beneficial to field management such as fertilization and medication in the later stage.