The latest course of techniques and methods for pest control of cypress trees

Cypress is a general term for cypress plants. Cypress contains Platycladus orientalis, Sabina vulgaris and other genera. It is widely distributed in China, ranging from Inner Mongolia and Jilin in the north to Guangdong and northern Guangxi in the south. It is an excellent landscaping tree species. Let's take a look at the prevention and control techniques of cypress diseases and insect pests.

Platycladus orientalis aphid

1. Make use of natural enemies, such as seven-star ladybug, discolored ladybug, solar wasp, aphid wasp, ash-eating aphid fly, lacewing and aphid-eating gadfly and so on. When the occurrence of spring is not serious, try not to apply medicine, but spray clear water to wash the insect body to protect the reproduction and development of natural enemies in the future.

2. Chemical control: when the occurrence is serious, spray 25% Aktai water dispersible granule or 20% Kangfuduo concentrated solvent 5000 times. About 20 generations occur every year, which is large and harmful all the year round. The control can be controlled by spraying 1.2% bitter tobacco EC 1000-1500 times, or spraying 10% imidacloprid wettable powder 2000 times.

Platycladus orientalis red spider

1. Under the condition that the growth and ornamental of the trees are not affected, it can be washed with clean water or washed with 0.1-0.3 degree stone-sulfur mixture.

2. Sprinkle the powder evenly on the bottom of the ditch, cover the soil and pour enough water. Or in the curved ditch (or open pier) irrigate 100 times the 40% omethoate EC, the dry diameter is 2-3 kg per centimeter, seal the pier after infiltration, the efficacy is long, the effect is good, and does not pollute the air, does not harm natural enemies, spray with acaricides such as 800x 20% triclofenac EC or 2000 times 73% paracetamol EC. When spraying, we must grasp the initial period, spray evenly, and strive to spray once in early May and early October every year, that is, we can basically control the mite damage.

Leaf blight of Platycladus orientalis

1. Clean the diseased leaves under the tree in autumn and winter, burn and dye the source. Eliminate the pathogen of wintering and reduce the first invasion.

2. From May to August, spray Bordeaux solution with Bordeaux liquid once every two weeks, especially pay attention to strictly control the primary infection, find the center of primary infection, block it and prevent it from spreading.

3. The over-dense cypress forest should be thinned properly to make the forest ventilated and transparent and reduce the disease conditions.

Platycladus orientalis leaf blight

1. Moderate pruning can improve the growth environment of Platycladus orientalis and reduce the source of infection.

2. increase the application of fertilizer to promote growth.

3. During the peak period of ascospore release, 40% aldicarb, or 40% carbendazim, or 40% chlorothalonil 500 times solution was sprayed for control.

4. Disease-resistant varieties were selected.

Platycladus oriental caterpillar

1. Agricultural control: strengthen forest management, prune and cut in time, peel the bark around in the overwintering period, burn it centrally, and capture it artificially when the larvae occur.

2. Physical control: according to the phototaxis of adults, a black light is set up to trap and kill adults.

3. Biological control: there are many kinds of natural enemies of this insect, so we should try not to use chemical control when the quantity is small, and pay attention to protect the natural enemies, such as releasing parasitic wasps.

4. Chemical control: when the larva density is high, it is appropriate to treat early. Use aircraft low-capacity spraying 25% diflubenzuron 3 to control larvae, 23-45 grams per mu, spray 10.5 kg, the control effect can reach 98%. Aircraft control should be carried out in sunny days, under the condition of wind force below grade 3, artificial spraying of 25% thiazuron 3, 11500 times liquid can control larvae, the effect can reach more than 90%. General control should be carried out at the age of 2 to 4 years old, and a small amount of pyrethroid pesticides can be added according to the need.

Anoplophora alternatus

1. Strengthen the management: ① dig deep to loosen the soil, dig trenches to press the green, and apply soil and miscellaneous fertilizer to promote the rapid growth of seedlings and enhance the tree potential. ② carried out thinning in winter to remove pest trees, weak trees, pressed trees, etc., so as to make the stand thinning and dense, good ventilation and light transmission, exuberant tree growth and enhance resistance to insect pests. ③ cut dead wood and wind-broken wood in time in summer, remove rhizosphere sprouting, remove branches in the forest, and keep the forest sanitary.

2. Artificial capture: before ① overwintering adults go out, brush the tree trunks less than 2 meters with white coating to prevent adults from spawning in the woodland where insect pests occurred in the previous year. ② overwintering adults catch adults in the forest during mating activities. ③ is harmful to the newly hatched larvae, scraping the bark with a knife and killing the larvae. You can also use a wooden hammer to hit the grease and kill the newly hatched larvae.

3. Chemical control: in the adult stage of ①, dichlorvos can be fumigated in forest areas with high population density and high canopy density. ② newly hatched larvae can use 6% wettable BHC, 50% methyl omethoate emulsion, 20% beneficial fruit emulsion, 20% fruit and vegetable phosphorus emulsion, 25% insecticidal amidine water agent 100 times liquid, 8% dichlorvos 1 times, first-line oil (diesel or kerosene) 9 times mixture, wet the tree trunk below 3 meters or key spray grease, the effect is very good.

4. Many kinds of natural enemies should be protected and utilized, such as the larva and pupa stage of longicorn beetle, cocoon wasp with handle, swollen leg, red-headed cocoon wasp, white-bellied cocoon wasp and so on.