In cabbage, radish, kale, kale, etc. in the growth process, there is a kind of insect pest that is very harmful, which plagues vegetable farmers and affects the quality and yield of vegetables. The larvae and adults of the yellow curved stripe are pests in the root system and aboveground plants in the soil, respectively, the adult insects have strong reproductive ability, the generation overlap is serious, and the adult insects have jumping and migration hazards, which are extremely difficult to control.
<h1>1. The harmful characteristics of yellow curved strip jumping armor</h1>
Adult insects are lively and good at jumping, jumping and escaping in case of alarm, mostly inhabiting the leaf back, roots and soil crevices, feeding activities are more frequent at 8-10 a.m., 4-6 p.m., often in the contact of two vegetable leaves, in the heart of the vegetable or on the back of the leaf stickers, resulting in leaf holes, photosynthesis decreased, and finally only leaf veins, or even death, heavy humidity in the field.
Adults produce on sunny days, and the eggs are laid in the soil within 3 cm around the root system of the crop, and the relative humidity of the eggs is required to be more than 80% when they hatch.
After hatching, the larvae peel off the epidermis of the root along the whisker root to the main root, forming an irregular strip scar, and can also bite off the lateral root, making the leaves of the plant yellow and wilting, and even causing decay and soft rot to spread.
Occurrence trend: Generally, 4-5 generations occur in North China, 7-8 generations in South China, north of the Yangtze River, adult insects overwinter in dead branches and leaves, weeds or soil crevices; in the south of the Yangtze River, there is no obvious overwintering phenomenon. The temperature of the yellow curved stripe jumping nail is 21-27 ° C, below 18 ° C or above 28 ° C, and the adult insect activity is less. There are two peaks of spring, summer and autumn every year, the first peak from early April to late May, the lighter occurrence due to high temperatures in June and August, and the peak of hazards again after mid-September due to temperature drops.
<h1>2. Comprehensive prevention and control measures</h1>
(1) Chemical control
Larval control: Larvae live in the soil, more difficult to control, larval control period in adult peak 13-16 days, with 40% chlorpyrifosiasis · thiamethoxam root irrigation. It can also be coated with a 70% thiothiazine seed coating agent.
Adult insect control: the selection of avermectin, chlorhexensis , cypermethrin, high efficiency cypermethrin, matrine and other agents, in the morning adults just unearthed or 5-6 o'clock in the afternoon drug control, if the adults are latent or active during the spraying of pesticides, the control effect is poor.
(2) Booby traps and kills adult insects
Adult yellow strip jumping beetle has a phototropism and a strong tendency to yellow, can be hung in the field to induce yellow strip jumping beetle, small cabbage moth and other pests, generally set 20-30 pieces per acre, every week or so to replace once. Install vibration frequency insecticidal lamps at a distance of 70-80 meters in the planting area of the host crop, turn on the lights from the beginning of May to late October, and pay attention to prevention and control within 10 meters from the light source.
(3) Agricultural control
(1) Irrigate the fields with good conditions and irrigate the larvae with water.
(2) Yellow curved strip jumping nails are partial to cruciferous vegetables, and the harm is light with other vegetable rotations.
(3) After harvesting the former stubble vegetables, especially the food-loving hosts, remove the disease residues and weeds in time; increase the soil or sprinkle the field with white lime for 5-7 days before planting, and reduce the insect population base.
In summary, in terms of practical production, in view of the living habits and harmful characteristics of yellow curved strip jumping nails, green prevention and control measures such as yellow plates, insecticidal lamp traps + chemical agents to irrigate roots to kill larvae and spray to treat adult insects + Qingyuan irrigation to kill insects, crop rotation and so on should be adopted to reduce the use of pesticides and improve the safety of vegetable production.
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