The yellow song stripe is commonly known as vegetable dumplings and soil flea. It happens in Beijing. Hosts are cruciferous Chinese cabbage, cabbage, broccoli, radish, canola, turnips, etc.
Damage symptoms
The yellow-trimmed larvae have a body length of 2 millimeters and are shiny and black. They are good at jumping and moving. The leaves of adult pests were round-shaped, which was the most serious damage to the seedling stage of Chinese cabbage. Freshly emerged seedlings, cotyledons will cause the entire plant to die after eating, feeding on the leaves of the seedling stage, resulting in leaves missing, reducing photosynthesis, affecting the formation of strong seedlings. Remaining fields are mainly responsible for flower buds and tender pods. The larva only harms the roots, and it cuts the root epidermis into many crooked insect paths, snaps off the roots of the fibrous roots, and leaves the leaves yellow and wilt from the outside to the inside. The radish suffers, causing many black ecchymosis, and finally turns black and rot; the cabbage is damaged, the leaves darken, the plants die, and the soft rot spreads.
Occurrence characteristics
4-5 generations occur in Beijing every year. The spring and autumn seasons are serious throughout the year, and after the rainy season in autumn, the soil and air humidity in the fields are high, the air temperature is high, and there is no wind, which is suitable for adult activity and the hatching rate of eggs is high. Therefore, the fall of the yellow stripe in the fall occurs more than in the spring, and the field with low specific humidity with high soil moisture is heavy.
Control methods
1. Agricultural measures: Rotation of cruciferous vegetables and other vegetables in the crop rotation can reduce the damage; clean the pastoral areas in the autumn after the open season, remove weeds and plant diseases, eliminate overwintering sites and foodstuff bases; carry out land ploughing in spring and autumn, Destroy adult, larval, and pupa overwintering sites and reduce the number of insect populations. Protection facilities use summer high-temperature dwellings to handle and control the occurrence of yellow song strips.
2. Physical measures: Using the characteristics of adults sensitive to black light, install a solar-powered insecticidal lamp every 30-50 acres in the vegetable field to trap and kill adult insects. The trapping effect can reach 60%-70%.
3. Chemical control: 99% of mineral oil is diluted 150-200 times with water, and mixed with 4.5% of beta-cypermethrin 1000 times; or mixed with 20% of Calamus for 1,000 times to spray. 7 days control once, continuous control twice, can effectively control adult damage, the two agents alternately use better.
Precautions
According to the characteristics of Chinese cabbage yellow stripe leaping around at noon, the spraying time is best carried out after the dew subsides in the morning, and evenly sprays the surface, leaves and leaves to improve the control effect. Safety precautions should be taken when spraying to avoid poisoning.
Guangdong Jia Mei Biological Technology Co.Ltd , https://www.jaymeimask.com