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, but “the oysters are delicious and hard to cook†is a 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 culprit of the pupa. 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 their eggs under earth seams or clods around leeks. After hatching, larvae gather around bulbs in the basement of leeks and around the soft stems. After damage, the larvae rot and the leeks become brown and rot to death. In severe cases, the entire plant dies of leeks and has a great influence on the yield and quality of leeks.
Antimony has strong anti-drug ability. Some highly toxic pesticides with long residues, such as methamidophos, 3911, methyl 1605, and formazan, have good control effects, but they do harm to consumers' health. use. Some relatively low-toxicity pyrethroid pesticides and chlorpyrifos, phoxim and other pesticides are not ideal for the control of earthworms. The main reason is that with continuous planting, the anti-drug resistance of earthworms has been greatly enhanced. In many places, vegetable growers have even had to give up the cultivation of leeks due to their 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 physical control. When pupa larvae occur, irrigation is performed three times in succession. Irrigation is done to submerge the ridge back and cause some suffocation to die. In addition, after the leeks have just been harvested, they will give off a rich amaranth flavor that will easily attract adult eggs. Therefore, immediately after harvest, the leek was covered with a plastic film for 3-5 days. After the leek wounds healed and the odor disappeared, the film was peeled off.
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 add nutrition to the leeks. Conditional vegetable farmers can also use biogas slurry control. When larvae occur, each leeks cut off with biogas slurry after harvesting, which can kill quail and increase organic fertilizer.
The third is the use of biological pesticides. Use 1.1% matrine powder, 2-4 kg per mu water 50-60 kg irrigation root. When irrigating the roots, remove the topsoil near the roots of the roots, remove the sprayer nozzles, and cover the soil with the ridges after pouring the liquid. In the fall, the shed is opened before the shed. After 2 to 3 days of drying, 25% diflubenzuron 3, 200 ml per mu, and 50-60 kg water, per mus, are used for irrigation. In addition, the use of Bacillus thuringiensis WP 5-6 kg per acre has a good effect on the control of cockroaches and has a longer duration of efficacy.
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