The insect source of the armyworm in Northeast China mainly comes from the Yangtze-Huaihe River Basin. After the emergence of the first-generation adult in this area, it usually moves to the northeast region to lay eggs from late May to mid-June, and two generations of larvae appear in the field in the upper and middle of June. Most of the larvae entered the 3rd instar in the middle and late June, and the larvae gradually evolved in the first half of July. The second generation of adults continued to reproduce in addition to the local reproduction, and most of them migrated southward to the Yangtze and Huaihe River basin, becoming a foreign worm in the area. source. The three generations of larvae that remain in the country are mostly in the late July and mid-August, and may cause damage to millet and corn in individual years. From late August to September, the emergence of the adults in the middle and the middle of the year, most of the adults moved south, a small number of stranded can not form a hazard generation. Therefore, from the national perspective, the northeastern region is the second-generation armyworm often-occurring area, the third-generation armyworm accidental area, and the main hazard is the second-generation armyworm.
Degree of occurrence
Level 1: Light occurrence, 5-10 larvae per 10 strains of corn.
Level 2: Moderate occurrence, 10 to 50 larvae per 10 strains of corn.
Level 3: Large occurrence, there are more than 50 larvae per 10 strains of corn.
Prevention
1, mining, attracting eggs. During adult spawning, according to the characteristics of adult spawning, continuous egg vaccination or removal of egg mass in the field can significantly reduce the number of eggs and larvae. This method is more effective for thin crops such as corn and sorghum. The method of tempting is to cut the grass (or straw) into 50 cm long, and tie each of the three into one. Insert one for every 20 steps and insert 40 to 50 for each hectare. ).
2, artificial killing and cultivating weeding to eliminate larvae. During the larval stage, weeding and weeding can be used to turn weeds and larvae under the soil to kill the larvae, which also reduces the humidity in the field and increases the larval mortality.
3. Chemical control. According to the forecast, the control period is strictly controlled, and the premature control is due to the fact that a considerable number of eggs in the field are not hatched, and the crops will still suffer. The prevention and treatment is late, the loss has been caused, the older larvae are highly resistant to drugs and the control effect is not good. Generally, most larvae are in the best age of application at the age of 3 (in the middle and late June). The insecticide can be used as a general contact agent and a stomach poison, and the pyrethroid pesticide or the pyrethroid compound and the organic phosphorus mixture have the best effect. Commonly used pharmaceutics and dosage per acre are: 2.5% enemy killing 30 ml; 5% to Fuling 20 ml; 24% killing 毙 40 ml; 30% jingling 50 ml; 25% gram 20-30 ml; 25% fast killing spirit 20-30 ml; 5% beta-cypermethrin 40 ml, etc., the amount of liquid per acre is 15-20 liters. The medical device used is preferably a motorized backpack sprayer.
Due to the large number of second-generation armyworms outbreak this year, the characteristics of strong control of the control of sticky insects are strong. The above-mentioned lights and sexual attractants are used to induce adult insects and reduce the amount of eggs in the field. At the same time, 45% chlorpyrifos EC can be used per acre. 15 to 20 ml, or 25% diflubenzuron 3 suspension 30 to 40 ml, or 50% phoxim emulsifiable concentrate 10 to 15 ml, or 2.5% cyhalothrin EC 15 ml to 30 kg of water spray, spray The drug time is preferably before 9 am and after 5 pm.
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