• Jumping armor: also known as earth fleas, yellow fleas, dog lice
• Host: Mainly cruciferous vegetables, but also harmful tomato fruits, melons, legumes vegetables
• Commonly have yellow curved stripe jumping armor, yellow straight striped jumping armor, yellow wide striped jumping armor, and yellow narrow strip jumping armor.
• Widely distributed in the country, and the insect population density is very high.
l Adults: Adults bite the leaves.
Ø Often dozens of groups of heads are harmed on a leaf, especially the back of the leaf, and the damaged leaves are covered with dense oval holes. Adults feed on the leaves, causing holes and missing carvings. Adults prefer to feed on the young parts of the leaves, so they are most affected at the seedling stage. It often causes the phenomenon of seedling destruction.
l Larval food root
o The larvae live in the soil and are specifically designed to harm the root bark of the host plant, causing its surface to form many irregular strip-like scars. At the same time, the root of the whisker is bitten off, causing the plant to turn yellow wilt and die.
• Adults often feed on the leaves in groups of 3 or 5, biting them into dense holes. The larvae live in the soil and specialize in mothting the host's root cortex, causing scars and tunnels, and wounds caused by larval infestations often cause soft rot of cruciferous vegetables.
Since the 1980s, the frequency of occurrence has increased greatly, and it has become a major pest of cruciferous vegetables in southern China, and in some places even surpassed the small cabbage moth.
The use of broad-spectrum insecticides makes it resistant to severe resistance.
There is no effective control method, and the spraying of insecticides remains the main control method.
l Generations
Over the past year, the generations have been increasing from north to south. Xinjiang, Northeast China 2-3 generations, North China 3-5 generations, Yangtze River Basin 4-6 generations, Guangdong 7-8 generations.
l Overwintering
â Tonnews in the north of South Ridge as adults crawl under the leaves of vegetables on the ground or in deciduous branches and weeds. There is no overwintering phenomenon in South China and it can breed all year round.
Peaks occur
â Twin-peaked type, spring and autumn are seriously harmful.
l Activity habits
Ø Lively, good at jumping, can fly at high temperatures.
Ø Hide under the back of leaves or dirt in the morning and evening or on cloudy days, and the activity is the most abundant around noon.
l Tendency
Ø Phototropism: Adults have strong phototropism and are particularly sensitive to black lights.
Ø Yellowing: Adults have strong yellowing phototropism - yellow plate insect attraction method.
o Tenderness: often concentrated on the young heart lobes as a pest.
l Lifespan
Ø Adult worms have a very long lifespan, averaging 50 days, up to one year. Reasons for generational overlap.
l Spawning habits
Ø The spawning period is long, up to 30-45 days, and the pre-spawning period is 4-9 days.
Ø Spawning time is mostly around noon on sunny days.
O The eggs are scattered in moist soil of about 3 cm around the plant or on fine roots.
Ø The amount of eggs laid is generally 100-150 grains/female, and the overwintering generation can reach 620 grains/female.
O The distribution of eggs in the soil is a group of individuals.
l Larvae
Ø A total of 3 years old, the depth of habitat in the soil is related to the distribution of crop roots. From the whisker root to the main root, from top to bottom.
Ø No transfer plant is harmful habit.
Ø The distribution in the soil is the same as that of eggs, which belongs to the aggregation distribution. Its basic component is the individual group.
l蛹
Ø Mature larvae are mostly pupated in soil 3-7 cm deep.
• The focus is on the control of overwintering insects when they move into vegetable fields in early spring. Spring vegetables are most advantageous for medicinal use from seedling emergence to the four-leaf (four-leaf) stage.
• Pharmaceutical control: mainly control adult insects and protect the seedling stage. 可使用惊喜1000-1500倍，蓝啶500-800倍，超瑞600-1000倍等。 Spraying should be sprayed from the edge of the field to the inside of the field to prevent adults from escaping.
• When larvae are found to be harming the roots, it is possible to spray or irrigate the roots with a superruising or Cabens 1000x liquid, 50 ml of liquid per plant.