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Outbreaks of C. japonica ginkgo causes and control measures


Forests in the intensive degree of walnut, sumac, chestnut and other economic Chunlin,[link widoczny dla zalogowanych], in conjunction with cultivator in autumn and winter fertilization, elimination of overwintering egg masses, and whitewashed the trunk, can both improve tree vigor and reducing population density. For natural forest, forest management should be strengthened, in 7-8 months a reasonable bathroom cutting, pruning clear irrigation, while removal of pupal cocoon, pupae and larvae damage concealed places. 4.3 Strengthening monitoring and forecasting insect pests forecasting work to establish institutions and networks. Distribution in the insect population, regular monitoring of C. japonica on the ginkgo, the timely release forecast information, to keep the incidence of C. japonica ginkgo, development, use the best opportunity to be the best way to take control. That is randomly selected from different types of forest more than 2O broadleaf plants,[link widoczny dla zalogowanych], the investigation in late April insect strain rate, if 3O below, fewer than 10 strains of insects, not disaster; in late June, the investigation of strain rate of cocoon , if the following 5O, strains less than 1O a cocoon, and any pupae collected 1,004,150, and by measuring the female than in the 4O below, the following year without disaster, otherwise in advance and appropriate control programs in a timely manner to control. 4.4 focus on biological control, biological control and chemical control combined with the natural balance of forest ecosystems, pest populations, inhibit the ability of pest damage, this ability of ecological systems from the natural enemies of pests, host of insect resistance, food resource constraints. Therefore, in areas where conditions permit, can be artificially propagated, imported, protection, use of natural enemies, pest control training pest species is a necessary measure, parasitic wasps can be collected back into the forest, increasing the number of species and natural enemies; forest hunting area birds, and attract beneficial birds of artificial nest boxes set up, stand enhancing self-control; use of Bacillus thuringiensis 1OO rod bacteria, viruses, etc. in the larvae of the cluster before the age of 3 to 4 hazard prevention and control of spray; for the site conditions are complex,[link widoczny dla zalogowanych], difficult to reach human forest pests, the dispenser can be used long-range launch Sen get insurance, Beauveria bassiana, Bt and other biological pest control kits for a large area, with a fast and efficient, secure and flexible control effect. In the use of chemical control, try to use the inhaler trunk hole injection to reduce the killing of natural enemies and environmental pollution. Instar according to chemical control and ecological environment, try to use high efficiency, low toxicity, light pollution or pollution-free agent, 1 to 3 years old in the larvae of the sensitive period, and when pest outbreaks drugs, pesticides should be properly mixed and used interchangeably, the local application, to avoid injury. And other economic trees of the walnut tree should be taken to the base of drilling injection control, that is the base of the trunk diameter of more than 20cm downward-sloping in different directions 45. 4 to 5 holes, deep 10 ~ 20cm, according to DBH 0.8mL/cm, injection of 5 or 2O imidacloprid imidacloprid EC agent, wet seal Wong. And the population density of large stand stand, the choice of 25 spraying 2000 times fenpropathrin, fenvalerate can also be used 2O 75 ~ 150mL/hm smoke control. The newly hatched larvae of the cluster up and down the tree should be used with deltamethrin poisoning ring, poison paper, poison pen stop killing, the effect is obvious. 4.5 In the event of hunting area with human cases not killed could be considered artificial, artificial culling effect completely, but the efficiency is not high. Eggs of C. japonica using ginkgo base in the host tree, tree saplings and low near the ground,[link widoczny dla zalogowanych], and the egg-shaped piece or stack features, combined with spring pests management or investigation, using a stick to beat egg masses or scrape egg masses; use 1 to 2 larvae often cluster in the dorsal feature, clear the worm leaves; with 6 mid-to late mature larvae pupate cocoons hanging in the host after a long time the base of branches or on the characteristics of ground cover plants, removal of the pupa cocoon, and egg together with the natural enemies of foodstuffs as a trap; mid to late 10 phototaxis by moths, flying strong male characteristics, with light or black light trap to trap and kill insects, combined with the pharmacy lamps, set in the open forest sites per 50 acres to set a, killing the male, less eggs,[link widoczny dla zalogowanych], to control the hazard before.
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