1. Place ：Chang'an Village, Gaocheng, Shijiazhuang
2. Medication time：April 30th, 2021
4.product name：HD-811 Worm adjuvant
5.Experiment with underground pests：Leek Maggot
（1）On April 30th, 2021, leek maggots occurred in 667 square meters of leek fields, and more than 18% of the area was affected. Dissolve 0.5 kg of HD-811 Underground Worm Additive in 100 liters of water, stir evenly, open the
container valve to gradually adjust the flow rate, and rinse with water. The flushing water flow is 18-20 tons per hour, and the worm additives dissolved in 100 liters after 40 minutes of irrigation are used up.
（2）On May 12th, 2021, 12 days after the application of the pesticide, there was no phenomenon of biting the leek roots in the 667 square meters of leek field. Leeks re-germinate from the roots of the original leek maggots, and the leek maggots have been completely controlled.