This is the common name for the late-spotted scorpion mosquito, and it is the main pest of leeks. The larvae concentrate mainly on the bulbs and tender stems of the leek. In the spring and autumn, the young stems of the leeks caused the rot of the roots, which caused the yellow leaves of the upper leaves to die. Many vegetable farmers use high-toxicity and high-residue pesticides such as carbofuran for prevention and control. Although they control the harm of earthworms, the pesticide residues of the products are greatly exceeded. In order to ensure the safety of food dishes, we should vigorously promote the comprehensive pollution prevention technology. First, agricultural control. (1) Avoid introducing insect sources when transplanting. The roots were transplanted or rooted with a 50% phoxim EC 1000 times solution. (2) Elimination of overwintering larvae and control of the number of insects. Under open cultivation conditions, earthworms are larvae wintering in the soil within the leek bulbs or in the soil layer near the roots. Watering in winter and spring can destroy its wintering environment, eliminate part of overwintering larvae, and reduce the number of insects. When pesticides are added in proper amount, the effect is better. (3) Scorpion larvae prefer to be damp and dry, not dry. Before the spring eels sprouted, they were removed from the surface soil and sun dried, and the larvae were dried after 5 to 6 days. Covering the ditch before planting wood ash. It is also possible to use 50% phoxim EC particles mixed with eutrophic soil and then cover the roots near the roots. (4) The application of adequately cooked organic fertilizer can reduce the occurrence of earthworms. (5) When the larvae are harmed, they can be poured with aqueous ammonium bicarbonate solution to kill larvae. (6) Adult worms have a certain tropism for sweet and sour liquid. In the adult eclosion stage, sugar, vinegar, wine, and water were blended in a ratio of 3:3:1:10 for sweet and sour vinegar, and 1/10 of 90% trichlorfon liquid was used for trapping and killing adults. Second, chemical control. Biological pesticides or high-efficiency, low-toxicity and low-residue chemical pesticides should be used. At the same time, the safety intervals of various pesticides should be strictly controlled (ie, the time from spraying to cutting should be applied, no less than 10 days should be used to prevent and control larvae, and insecticides should be used for pesticide control. Not less than 3-5 days). In order to ensure the prevention and control effects, we mastered the first and fifth generations of the Cangzhi treatment in control strategies, controlled the second generation, and adopted assault drugs before the rain. The use of pesticides should be noted in the alternative use of different types of pesticides to avoid the development of antibiotic resistance. (1) Control larvae. Optional pesticides and their appropriate concentration, 48% of chlorpyrifos (product name, Le Si Ben) 1000 times; 0.3% of matrine 1000 times; 75% of phoxim 700 times; also can choose new compound 48% Duxin EC (trade name Diweijing) or 20% pyroxanthin EC (éŸä¿ä¿). During the peak period of larvae (mid-to-late October, early May of the following year, late July and late July), when the yellow tip of the leek was found to become soft and gradually fall down to the ground, the roots were sprayed with the above liquid and then covered with soil, or In combination with soil, the above-mentioned medicaments are used to root. If near castration, the phytochemical matrine should be preferred. (2) Control adult worms. Optional pesticides and their suitable concentration; 3000 times high efficiency cypermethrin; 75% phoxim 1000 times solution. During the period of adulthood (mid-to-late October, mid-to-late April, mid-June, and late July to the middle of the year) at 9-10 am, use the above liquid to spray on the ground. China Agricultural Network Editor
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