How to prevent corn armyworm

Maize (2343, -12.00, -0.51%) armyworm has the characteristics of outbreak hazard, especially the three-generation armyworm has a potential threat, and the control is difficult. On the basis of strengthening monitoring, the following measures should be taken to control the damage of armyworm.

Adult trapping technology ( 1 ) Valley grass method. Generally , the grass handles with a diameter of 5 cm are inserted, 60 to 100 per acre , and replaced once every 5 days. The replaced grass is burned intensively to eliminate the eggs of the armyworm. ( 2 ) Sweet and sour method. Take 350 grams of brown sugar , 150 grams of white wine , 500 grams of vinegar , 250 grams of water , plus 90% of the crystal trichlorfon 15 grams, made into sweet and sour lure, placed in the pot, placed in the field 1 meter high place to trap Adult armyworm. ( 3 ) Sexual trapping method. With the configuration of the lure armyworm dry trap, a plunger mu hanging in the field, trap the adult. ( 4 ) Insect lamp method. In the adult period, insecticidal lamps are placed in the field, the lights are separated by 100 meters, and lights are turned on at night to trap adults.

Larval control technology The larvae are applied for prevention and treatment before the age of 3 years. ( 1 ) Biological pesticides: Spray the Bacillus thuringiensis ( Bt) preparation at the hatching stage of the armyworm egg , and note that the field near the mulberry field cannot be used. (2) chemical pesticides: diflubenzuron available young larvae; wheat or rice fields when the population density of more than 10 / m, the cornfield population density of 50 / one hundred or more, can be used phoxim, chlorpyrifos insecticide Spray control.

Blocking isolation technology can dig deep trenches on the transferred roads when the larvae are migrating, and concentrate on the armyworms falling into the ditch to prevent them from continuing to migrate; or sprinkle a 15 cm wide strip to block; or In the wheat and corn fields, phoxim poisonous soil was applied to establish a separation zone.

Protect and use natural enemies to release Trichogramma or scorpion to plant sap , soy (4606, -34.00, -0.73%) and other flowering plants to protect against the use of natural enemies such as spiders, parasitic wasps and frogs.

The area where the armyworms are concentrated and harmed should also strengthen the rule of prevention and control, and adopt emergency control methods such as navigation operations and high-bar spray machinery to control the damage of the armyworms to a local extent and prevent their migration hazards.