Mythimna separata, also known as the armyworm, is a sudden, migratory, and overeating pest, and its diet is very miscellaneous. The larvae mainly eat the leaves of the crops. In severe cases, the plants can be eaten as light rods, resulting in reduced production. Since mid-June, the city has experienced more precipitation, and the autumn crops are growing better. Crop conditions are conducive to the occurrence of three generations of armyworms; in July, the weather is hot and rainy, and the climatic conditions are suitable for the occurrence of three generations of armyworms. According to a survey conducted recently by Bazhou Plant Protection Station, some summer sowing maize have suffered from three generations of armyworms in varying degrees. In general, 5-10% of the larvae are infected, 8-10 worms are found in 100 strains, 30%-50% of the corn field strains are found in some weeds, 40-50 worms in 100 strains, and worms in the individual plants. 1-2 heads, some corn leaves were eaten as a short cut, posing a serious threat to crop production. Due to the migration habits of armyworms above 4 instars, most of the plants encountered during the migration were preyed. At present, the armyworm is 2-3 years old and some 4 years old. It is an opportunity for Hanfang to defend against the disease. It is hoped that the majority of farmers will pay attention to the inspection and treatment. Control methods: 1, 4.5% beta cypermethrin EC 30-60 ml per mu spray control. 2, 40% phoxim EC 1000 times spray control.
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