First, the harm symptoms Host oranges, oranges, limes, red oranges, grapefruit, etc., can also harm lemons, citrons and bergamot. Among them, the severity of the damage was lime and orange, followed by grapefruit red orange. Adults lay eggs in young citrus fruit. After hatching, the larvae wear licks in the interior of the fruit, often yellowing the fruit and causing redness in the yellow, causing the fruit to fall off in advance. In addition, the damaged fruit is seriously rotted, causing the fruit to completely lose its food value and seriously affecting the yield and quality. Second, the occurrence and damage law The citrus fruit fly occurs one generation in a year, and it is wintering in the soil. Overwintering and eclosion began in the late April of the following year. The end of April to mid-May was the peak of emergence. Adult activity lasts until the end of September. Female adults lay their eggs from early June to mid-July. The larvae begin to hatch in mid-July and the hatching period is early in September. From mid-October to late November, we will go for winter and winter. Each occurrence period of Guizhou Huishui is 10-20 days later. A very small number of late larvae and cockroaches can be transported with fruit, wintering in the fruit, and falling out of the damaged fruit after being matured in January and February. The emergence of adult feathers hides in the morning from 9 to 12 o'clock in the morning, especially after the rain is fine, when the temperature is high, the emergence is the highest. After emerged, adult eclosion often clusters in the green bar forest and bamboo forest near the orange orchard, and eats honeydew, which is secreted by aphids, as supplementary nutrition. Adults began to copulate after more than 20 days of emergence, and began laying eggs approximately 15 days after copulation. The eggs are produced in the young fruits of citrus plants, and the spawning sites and symptoms vary with the type of citrus. In the sweet orange, the eggs are produced between the umbilicus and the fruit waist, and the spawning areas are milky; in the orange, the eggs are in the near umbilicus, and the ovipositories are black dots; in the citron, the eggs are produced in the fruit pedicle. , The oviposition site has a round or oval-shaped brown hole. 2-14 eggs per hole, up to 40-70 grains. Each female lays about 150 eggs. After the eggs hatch in the fruit, the larvae feed in groups of orange segments. In the middle and late October, the fruit was destroyed. After the larvae matured, they fell to the ground with the fruit or climbed out before the fruit landed. Depth of soiling is usually 3-7 cm below the soil surface, with a maximum of 3 cm, exceeding 10 cm is extremely rare. The duration of each worm period was about 1 month in the egg period, about 3 months in the larvae, about 6 months in the pupa period, and several days to 45 days in the adult worm. Third, the main control technology 1, drug control. Using the habit of feeding supplemental nutrition (glucose) before spawning, adults of citrus big fruit flies can be trapped and killed by adulterants made of nectar-dried trichlorfon liquid or trichlorfon sugar liquid. The specific methods include spray method and hanging can method: (1) Spray: In the period of adult occurrence (mid-late to late June), use 90% crystals of trichlorfon 100 g (2 2) + brown sugar 3 kg + water 100 kg The proportion is formulated into 500-800 times liquid. Before the adults begin to feed at 9:00 am, large fog is sprayed on citrus leaves with dense foliage and more fruit in the orange orchard. The whole garden sprays 1/3 of the trees. Each tree sprays 1/3 of the canopy, changes the azimuth spray once every 5-7 days, and continuously sprays 4-5 times. (2) hanging cans: brown sugar, 5 kg, 1 kg of wine, 0.5 kg of vinegar, 0.2 kg of crystal trichlorfon, and 100 kg of water are formulated into liquid medicines, which are placed in flat bottom containers with a diameter of 15 cm or more (such as Coke bottles and hanging bottles). Baskets, jars, etc.) The depth of the liquid is preferably 3-4 cm. A few dry branches are placed in the tank to facilitate the adults to feed on the top and hung on the branches to trap the adult. Usually hang one can for every 3-5 trees. Hanging cans from the end of May to the end of June, replace the liquid every 5-7 days. One of the above methods. The liquid must be used immediately to prevent the failure of trichlorfon pesticides. At the same time according to the standard dispensing liquid, shall not increase or reduce the amount of crystal trichlorfy, so as not to reduce the trapping effect. 2, cut off the source of insects. Removal of green fruits: In the place where the citrus trees are relatively scattered and the citrus fruit flies are seriously endangered, all the green fruits of oranges, red tangerines, grapefruits, and oysters are extracted in July-August so that the fruit Larvae do not mature. The removed and picked up victim fruits can be treated with deep burial, flooding, incineration, hot water and other methods to kill the larvae in the fruit and achieve the purpose of breaking the generation. Cut down the trees: In areas where the citrus planting is very scattered, the varieties are aging, and the quality is poor, a method of cutting a old tree to plant a fine seeded citrus seedling can be adopted. In the place where the young fruit is removed and the tree is cut off, it is not necessary to trap the adult insect with liquid medicine. 3. Remove the pods and kill the larvae. From late September to mid-November, the unripe yellow and yellow red berries were picked up, and all the ground fruits on the ground were boiled, concentrated and buried to achieve the purpose of killing the larvae and cutting off the insect source. 4, plowing in the clear garden in winter to eliminate overwintering. Combine pruning and ploughing with fertilization in winter to eliminate part of the overwintering lice on the 10-15 cm layer of the surface. 5, plant quarantine. The larvae of citrus fruit fly can be spread with the fruit's transportation, and wintering can also spread with soil seedlings. Therefore, it is forbidden to transport pest-carrying fruits, seeds and soiled seedlings from infected areas. When non-transfers are not available, local quarantine should be conducted. Once it has been found that insect pests must be treated effectively, they must be transported.
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6, attention. The good liquid should be properly kept, so that people and animals, especially children, should not be wrongly taken in order to avoid causing poisoning to humans and animals. In the more conspicuous places in the citrus groves, "the cans in the trees must be poisonous and should not be misused" or "very toxic." Do not touch the word “!†to warn; the mouth of the container should be large, set up a rain-proof interface, and floats should be placed on the surface of the liquid to provide habitat for adult feeding; sugar should not be used instead of brown sugar, and the higher the brown sugar concentration, the greater the trapping effect. it is good.
Control of citrus fruit fly