Yellow curly stripe jumping nails are widely distributed in China, mainly cruciferous vegetables such as cabbage, cauliflower, radish, and cabbage hearts, but also for pest tomato fruits, melons, legumes and vegetables. Adults and larvae can be pests. Adult insects eat leaves, the most serious harm to the seedling stage, just unearthed seedlings, after the cotyledons are eaten, the whole plant dies, resulting in a lack of seedlings and ridges. In the reserved planting areas, the main harm to flower buds and tender pods. The larvae peel off the roots, moth the roots, and bite off the roots, causing the leaves to wilt and die. After the radish is killed, it shows many black spots, and finally the whole thing turns black and rots; after the cabbage is damaged, the leaves turn black and die, and soft rot is transmitted.
Adult: 1.8 to 2.4 mm long, small black beetle, each with a yellow longitudinal spot on the elytra, narrow and curved in the middle. The hind foot leg segments are enlarged, so they are good at jumping, and the tibia and tarsal segments are yellow-brown (pictured).
Larvae: The body of the old mature larvae is about 4 mm long, oblong-cylindrical, yellow-white, with insignificant sarcoma in each segment, and fine hairs.
Eggs: about 0.3 mm long, oval, pale yellow, translucent.
Pupae: about 2 mm long, oval, milky white, the head is hidden under the anterior thorax, the wings and feet reach the 5th abdominal segment, and there are sparse brown bristles on the back of the thorax. There is a fork-like protrusion at the end of the abdomen, and the fork end is brown.
Adults overwinter in deciduous and weedy formations. In the following spring, the temperature reaches above 10 °C, and the amount of food increases greatly when it reaches 20 °C. Adults are good at jumping, can fly in high temperatures, and are most active around noon. Phototropic and sensitive to black light. Adults have a long lifespan and can extend the spawning period for more than 1 month, so generations overlap and irregularities occur. The eggs are scattered in moist soil crevices or fine roots around the plant, and an average of about 200 eggs are laid per female. The larvae need to hatch in high humidity conditions, so there are more fields near the ditch, and the vegetable fields with high humidity are heavier than the vegetable fields with low humidity. After hatching, the larvae nibble on the root surface in the topsoil layer of 3 to 5 cm, and the larval development period is 11 to 16 days, a total of 3 years old. The mature larvae pupate in the soil 3 to 7 cm deep, and the pupal stage is about 20 days. It occurs heavily throughout the year in both spring and autumn, and autumn is heavier than spring.
Agricultural control removes the fallen leaves of vegetable fields, eradicates weeds, and eliminates their wintering sites and feeding bases. Deep ploughing of the soil before sowing creates an environment that is not conducive to the life of the larvae and eliminates some pupae.
It can be sprayed with 90% dimethoate soluble powder 1000 times liquid, or 50% octylthion emulsion 1000 times liquid, or 21% cypermethrin malathion emulsion 4000 times liquid, or 25% thiamethiazide water dispersible granules 4000 to 6000 times liquid sprayed on a large area to control adult insects, the first two agents can also be used for root control of larvae.
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