Sunlight high-temperature coating method for preventing and controlling cockroaches

Cut leek

If the growth of leeks is very sparse and one can easily see the roots and soil of leeks, you can directly cut a 30cm high shed on the ground and cover the shed without cutting the leeks. If the leek grows vigorously, in order not to shade the leek leaves and affect the temperature of the soil exposed to sunlight, the leek can be cut in 1 to 2 days before the film is covered. The leek is not easy to grow too long, and it should be as flat as the ground. If the ground stays too long, it will not be easy for young leeks to pick up old leeks, resulting in slow growth. Some weaker leeks will die due to the top not breaking old pods; in addition, the high temperatures in the film will steam the glutinous rice and remove the old ones. The maggot emits a stronger odor and can easily attract nearby flies.

Look at the weather coated clay

From late April to mid-September, choose solar-enriched weather coating. It is best to choose a light blue non-drop film with good light transmission, no water fog on the film, and a thickness of 0.10~0.12mm. Four weeks after the film is covered with soil tightly. Because the temperature at the junction of the membrane and the soil is low, if the root system of the leeks is just on the edge of the membrane, there may be a small amount of worms that are not easy to kill. Therefore, the area of ​​the membrane must be larger than the area of ​​the plot, and the perimeter of the membrane should be as much as about 50 cm beyond the edge of the plot.

To remove the film

The temperature of 5cm depth in the film shall continue to be above 40°C for more than 3 hours (that is, the film shall be peeled off before 8am and the film shall be peeled off around 6pm on the same day). The plastic film shall be opened to remove eggs, larvae, cockroaches and adults of cockroaches. All died and even killed some other pests. If the film is suddenly exposed to cloudy days or the soil temperature is not enough to kill the cockroach, you can continue to cover the film until the soil temperature rises and the cockroach is killed and then the film is removed. This does not affect the growth of the chive. Watering irrigation

After uncovering the film, the seedlings should be watered in a timely manner after the soil temperature is lowered, and the soil is kept moist during the growth. Wherever possible, a beneficial biological bacterial fertilizer can be applied.

The roots of leeks under the film treatment are not harmed, and new leaves grow after 5 to 8 days. After the film was coated, the growth of leeks was slow in the early stage and accelerated in the later stage. After 20 days, the height of leeks in the control group had no significant difference. In summer, the leeks in the rooting period are treated with sun exposure and high temperature mulching before the end of May, so as not to affect the rooting of leeks. The leeks that are harvested in summer can be cut and killed at any time. If you plan to plant new or newly transplanted crops, it must be treated in advance by the sun exposure high temperature coating method. If you are not in a hurry to plant immediately, you can cover it for several days to completely kill other pests in the soil. Http://

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