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1. Habits of life The fruit fly of Bactrocera dorsalis occurs one year in a year. The bees live in the soil for winter. The adults prospered in early May, spawned in mid-June, and spawned in July-August. In late August to 9 The larvae hatch in the later part of the month. Adults emerge during mating in the daytime and often use insect honey dew to feed on honey, wine, and brown sugar. The eggs are produced in the skin or flesh, and the larvae are harmed in the scorpion septum, and the larvae may eat or eat. Damaged fruit is commonly known as "Fructus lychnophora" and "Sweet mandarin orange". It often appears as unripe first yellow and yellowish red, most of which naturally fall off before harvest. Orange parks with a high degree of concealment are more seriously affected, and insects are more easily found in loose soils.
2. Transmission Pathways Citrus big fruit flies spread long distances through larvae with citrus fruits and other products through transport and citron thrown into rivers. Adult flight is the main route for the close communication between orchards in the area.
3. Methods of prevention and control Citrus big fruit flies occur only once a year in China, and their control is easier than other multi-generation pests. After years of research and prevention and control practices, China has formed a relatively mature quarantine prevention and control strategy that can effectively control its damage in the area of ​​citrus fruit fly. The prevention and control methods mainly include:
3.1 The fruits and soil seedlings in the blockade epidemic area shall not be listed for sale, export or outward transport. The fruits and citrus seedlings with soil shall not be transferred to the affected area.
3.2 Entrapment of adults The adults of Citrus medica adults have the habit of feeding supplementary nutrients (glucose) prior to spawning. Adults may be trapped and killed by saccharine, vinegar and trichlorfon liquids or trichlorfon sugar solution. Specific methods are spraying and hanging cans:
3.2.1 The spray method is used to prepare a 1,000-fold liquid at a rate of 90% crystals of trichlorfon 50g, brown sugar 1.5kg, and water 50kg at the age of adult emergence (mid-late to late June). Before eating, big fog was sprayed on the back of citrus leaves with dense foliage and more fruit in citrus orchards. The whole park sprayed 1/3 of the trees. Each tree sprayed 1/3 of the canopy, separated every 5-7 days, changed the azimuth spray once, and sprayed four or five times in a row.
3.2.2 Hanging cans method Formulated with brown sugar 5kg, wine 1kg, vinegar 0.5kg, crystal trichlorfon 0.2kg, water 100kg ratio formulated into a liquid container in a 15cm-diameter flat bottom container (such as coke bottles, hanging baskets , tanks, etc.), the depth of the liquid to 3-4cm is appropriate, put a few dry branches in the tank for adults to stand on the top feeding, and then hung on the branches to trap the adult. Usually hang 1 can for every 3-5 trees. Hang the cans from late May until the end of June and replace the fluid every 5-7 days.
One of the above methods. The liquid medicine must be used in accordance with the standard dose, to prevent the decomposition of pesticides and reduce the trapping effect. It is particularly worth noting that the well-prepared liquid medicine should be properly kept, so that people, animals and children in particular should not be mistakenly dressed to avoid causing poisoning to humans and animals. In the more conspicuous place in the citrus orchard, insert the words "the cans inside the tree are poisonous and should not be misused". Or "very toxic, may not touch!" Words to be warned; the surface of liquid medicine to be floating, providing habitat for adult feeding; can not use sugar instead of brown sugar.
3.3 Elimination of Insect Sources 3.3.1 Removal of Fruits In the place where the citrus trees are relatively scattered and the citrus fruit fly is seriously endangered, all the citrus fruits of citrus, red tangerine, grapefruit, and crustaceans are fully plucked and cooked from July to August. Or sprinkle with lime and deep in order to achieve the purpose of dating. This year, this method was adopted for deep-buried citrus fruits in Guangyuan City, Sichuan Province.
3.3.2 Deforestation In regions where the cultivation of citrus is very fragmented, the varieties are aging, and the quality is poor, a method of cutting 1 old tree to plant 1 fine seeded citrus seedling can be adopted. In the place where young fruit is removed and the tree is cut off, it is no longer necessary to trap the adult insect with liquid medicine.
3.3.3 Removal of pods From late September to mid-November, remove unripe pods with yellow and yellow pods. Pick all the fallen fruits on the ground and boil them or sprinkle them with lime to bury the larvae. The purpose of the insect source.
3.3.4 In the winter, the clearing of the garden will be eliminated and the overwintering will be eliminated. In conjunction with the winter pruning, the ploughing and fertilization will be carried out to eliminate part of the overwintering layer on the 10-15 cm layer of the surface.
Bactrocera (Tetradacus) minax (Enderlein) is a subfamily of the family Drosophilidae of the fruit fly family. It only harms citrus fruits such as lime, lemon, grapefruit, milo, orange, bergamot, tangerine, and grapefruit. plant. The worm has been in our country for many years. As a quarantine pest, it has always been the object of monitoring and control. There are more mature prevention and control methods.