Causes of damage increase of citrus fruit fly and control methods

1. The pest base still exists. Past years of joint defense have controlled the citrus fruit flies in marginal village groups, marginal lands, sporadic trees (gardens) and new areas that have not yet produced yields. In recent years, they have begun to spread to major producing areas. Places where the hazards are serious occur mainly in the new citrus production areas and the margins of the main production areas, as well as the citrus orchards around citrus waxing plants and trading venues. The large number of surviving bases is an important cause of the increase in citrus fruit fly damage.

2, ignore the hazards, prevention slack. The farmers managed to loosen the management of the citrus orchard; the border area of ​​the administrative region was a dead end in control; if the management was neglected, the base of the insect source could easily rise; the mandarin orange was arbitrarily thrown into rivers, dunghills, pig houses, and toilets to spread the insect source; The emigration and relocation, the transfer of a large number of rural laborers, led to the unmanned management of the remote corners of the citrus, adding new difficulties to the defense of Bactrocera.

3. Increased pest resistance and long adult activity. Due to the long-term use of a single pesticide, crystal trichlorfon, the resistance of citrus fruit flies increased, and although the dosage was increased, the control effect decreased. Many species of honey plants are abundant, which is conducive to adult activity of B. dorsalis, long active period of adults, and long spawning period; differences in microclimate and site conditions of mountainous areas are great. Overwintering grasshoppers are not well-growth and development period is long, and adults have a long period of excavation, which is not conducive to chemical control. , resulting in increased harm.

4, citrus trading is frequent. With a developed market economy, citruses in all parts of the country circulate in large quantities, and rotting fruits are discarded at will, invisibly leading to pests.

Second, comprehensive prevention and control methods and methods

1. The prevention and control link has been highlighted. The traditional joint defense prevention and control technology and experience strictly control the “four issues of ground closure, adult trapping, fruit extraction, and transport quarantine” and adopt the “unified leadership, unified actions, unified time, unified spraying, and unified removal” five unified measures. All localities often only pay attention to the last three levels in the actual operation process, and ignore the first level of ground blocking. Now it is necessary to highlight the ground blocking and killing, to increase the intensity of dying of overwintering mites and unearthed adults, and to reduce the difficulty of pesticide control and the base number of insects, so that the cost of prevention and control is low. After killing the nets, the trapping and killing of the adult worms was carried out. The trapping and killing did not thoroughly remove the harmed fruits, and the severely removed and severely transported quarantine check was closed. Ground blocking methods: First, cultivating soil in winter and spring seasons, exposing earthworms to the surface, using animal feed and low temperatures, and climate change to cause earthworms to naturally die; second, using 5 kg or 48% chlorsulfuron per acre. The 1,000-time liquid is evenly sprayed (sprinkled) on the citrus table under the citrus orchard tree, the concentrated fruit collection place, the citrus waxing factory, and the citrus garden around the trading site, and the newly emerged adult is touched.

2, drug control methods highlight the hanging bottle (bowl) trapping. In order to improve the control effect, chemical control can be changed from spray trapping to spray trapping and trapping trapping and killing, hanging bottles (bowl) trapping and killing, followed by spray trapping. Hanging bottles (bowls), compared with the spray, have the characteristics of labor saving, time saving, low cost, convenient, reusable, trapping and killing adults. The production method of seduce bottles is to: Cut all kinds of beverage bottles on both sides of the bottle wall 10 centimeters from the bottom of the bottle, symmetrically cut out a 3 cm long slit, and then cut 5 centimeters along the left and right sides of the scallops and then turn left and right. Two pieces flipped upwards, like a rain canopy, to ease the rain. The bottle hanging method is: After the prepared liquid medicine is poured into the bottle, the bottle is hung on the trunk at a height of 1-1.5 meters from the ground, and the bottle body is fixed to prevent the splash of the medicine and facilitate the pests to enter the feeding. The bottle density should be 5-10 bottles per mu. 7-10 days to replace the drug, do clean, shelter from the rain, sunscreen, fixed. The trapping liquid formula is trichlorfon (or Lexus) 15-20 times liquid +10% brown sugar (honey) or 0.02% fly baiting bait 15-20 times, each bottle filling liquid 50 ml.

3, choose a variety of drugs to use alternately. In the oviposition phase of citrus fruit fly, 90% crystals of dipterex 600 times, 3% brown sugar (honey) solution, 48% Lethburn 1000 times solution, 3% brown sugar (honey) solution, fenvalerate were used. 800 times liquid or 0.02% fly fly bait 600 times liquid spray trap. The liquid is fully dissolved and mixed, used alternately, sprayed once every 7-10 days, sprayed 3-4 times, and sprayed less than 24 hours after spraying if it should be raining.

4, gradually reduce the scope of crown spray. The scope of the canopy spray was changed from spraying the entire garden to spraying only 1/3 of the tree in the orchard and 1/3 of the canopy area in the middle and upper part. Sporadic orchards (trees) were sprayed in the whole park. Spray time, first low orchard orchard, high altitude after orchard.

5. The pod processing was changed from boiling to deep burying. After the pods were removed, the burdock was dug and buried deep in the ground at a depth of 1.5 meters. On top of the ponkan, 10 times liquids such as dichlorvos, trichlorfon, and water-containing phosphorothiophene were sprayed on the film and the film was covered with soil. The following year, the drug was blocked again in the ground blocking period.

6, high access to species and species partition configuration. The use of high-alternative plant species and zoning allocation as a control measure will cut off the food chain of the big fruit fly and narrow the scope of joint defense. High-risk access to a variety of concentrated species, a group of a village and a variety.

7, transport quarantine from the quarantine place of origin. We must resolutely eliminate the sale of fruit from infected areas to non-epidemic areas, and strictly prohibit fruit growers from bringing ponkan into the market or exporting them. For the stopover and the entry of citrus from other places into the local citrus, strict quarantine is strictly prohibited so as not to introduce new insect sources.

8, set up a machine defense team to improve the effectiveness of joint defense. Take government funding, township and township responsibility, county and township technical departments to implement technical guidance, and village groups implement the park (trees). Responsibility is clear to the unit to the people, detailed to each link, and each responsibility is fulfilled. Technical service centers or major citrus producers are the main players, and plant protection and defense service teams are set up.

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