Control methods: 1. Weeding and disinfestation: Weeds are the foodstuffs for young tigers laying grounds and newly hatched larvae. They are also important bridges for transferring larvae to crops. Weeds and field weeds must be removed before transplanting or spring sowing. 2, bait trapping: with 90% trichlorfon 300 grams of water 2.5 kilograms, dissolved in 50 kilograms of chopped fresh weeds, scattered in the evening to sow in the field, mu 25 kg of bait. 3, poisonous soil law: 50% phoxim 500 grams of water mixed with fine soil 50 kg, 20 kg of toxic soil per acre, in the evening anterograde applied to the roots of seedlings. 4. Irrigation: Use 48% of Leptin or 50% phoxim 1000 times, or 2,000 times the amount of fluid to root. 5. Manual killing: In the morning, the larvae in the hole are killed near the bitten seedlings, and the seedlings are promptly filled.