Ask the teachers what medicine to use to prevent snails.

Harm: wild slugs mainly harm seedlings, young leaves and tender stems, and eat young leaves into holes or nicks; Bite off seedlings and tender stems, resulting in lack of seedlings and broken ridges, while excreting feces and secreting mucus to pollute vegetables. Prevention and control: Apply 5-7 kg of calcium magnesium phosphate fertilizer per mu, and apply it to ditches, fields or crops for deworming in the harmful period. 6% carbaryl tetraacetaldehyde granules are made into bean cake powder or corn flour bait containing about 4% of active ingredients, which are scattered on the field ridges in the evening to trap and kill; Or spray 48% chlorpyrifos l500 times in the morning. Spraying high-potassium compound fertilizer on plants can not only fertilize plants, but also kill adults and their eggs, which should be the best way to kill slugs.

I would like to remind you that farmers must not be impatient when spraying pesticides on vegetables. It is best to eat it once every 10 day, otherwise there will be too many pesticides left on vegetables, which will bring harm to human body.