韭蛆 There is no way to prevent pollution

韭蛆 There is no way to prevent pollution

In the past few years, during the winter and especially before and after the Spring Festival, the prices of greenhouses and oyster leeks have not been low. However, it is a big headache for most vegetable farmers. The four generations occur every year, which occur in early May, mid June, early August and late September. Planting leeks in the shed, from December to February of the following year is the main damage period of crickets. Therefore, it is now a critical period for the prevention of paralysis in the shed.

Aphid, the scientific name leeks, is a major underground pest in the production of leeks. Adults lay eggs under earth seams or clods around leeks. After hatching, larvae gather around the bulbs and soft stems of the leeks (left). After damage, the young stems rot and the leeks become yellow. It rots and dies. In severe cases, the entire plant dies of leeks, which has a great influence on the yield and quality of leeks.

The anti-drug resistance is very strong. In the past, the farmers used anti-rabbits to use some pesticides with high residue levels, such as methamidophos, 3911, 1605, methyl 1605, and formazan, which are now strictly prohibited in the country. Using these pesticides on vegetables, some relatively low-toxic pyrethroid pesticides and pesticides such as chlorpyrifos and phoxim, which are currently used by vegetable growers, are not ideal for the control of earthworms. The main reason is that with continuous planting Drug capacity has been greatly enhanced. In many places, farmers have even had to give up the cultivation of leeks due to the lack of effective control.

In the past few years, we have explored and summed up a set of methods for preventing and controlling detritus through multiple trials in the field, achieving more obvious prevention and control effects, and can completely meet the requirements of pollution-free cultivation.

The first is: Take physical control. When larvae occur in early spring and autumn, they are continuously fed with water for 3 times. The water is flooded to submerge the ridge back and some roots suffocate. In addition, after the leeks have just been harvested, the leek emits a rich leeks taste that easily attracts adults to lay eggs. Therefore, after harvesting, the leek was immediately covered with plastic film for 3 to 5 days until the leek wounds healed. After the odor disappeared, the film was peeled off again.

The second is: biological control. Use a spade to plow out a 5-10 cm deep ditch in the leeks of the leeks, sprinkle the ash in the ditch, cover the ditch and grass ash with the soil, and pour the leeks over the water. Sprinkle the ash in the leeks, not only in the ground, but also in adding fertilizer to the leeks. Conditional vegetable farmers can also use biogas slurry control. When larvae occur in early spring and autumn, after each leeks are cut, the roots are irrigated with biogas slurry, which can kill earthworms and increase organic fertilizers.

The third is: the use of biological pesticides control: the use of 1.1% matrine powder, with 2-4 square meters with 2-4kg water 50-60kg irrigation root. When irrigating the roots, remove the topsoil near the roots, remove the sprayer and place the sprinkler along the ridge after pouring the liquid; cover the soil in front of the cover sheds in the fall; use the 25% diflubenzuron per 667 square meters for 2-3 days after drying. No. Suspending agent 200 ml water 50-60 kg Shun ridge irrigation. In addition, every 667 square meters with Bacillus thuringiensis wettable powder 5-6kg, also has a good effect on the prevention and treatment of cockroaches, and a longer period of validity.

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