Pest Control Techniques of Pinus bungeana

White bark pine, also known as white bone pine, three needle pine, white fruit pine, tiger skin pine, etc., is a tree species endemic to China, born in the area of 500-1800 meters above sea level, wood is generally used for construction and furniture, stationery, etc., seeds can be eaten or squeezed oil, cones are used as medicine, it has high cultivation value, and there are few general diseases and insect pests. Let's take a look at the pest control techniques of Pinus elliottii.

Red fat bark beetle

[harmful] the tunnel eaten by the red resin beetle is filled with a mixture of reddish-brown granular insect dung and sawdust, which overflows from the invading hole with pine resin to form a reddish-brown funnel or irregular clot with holes in the center. The size of the clot varies, and the color changes from dark to gray with the passage of time. When the insect population density is high and the damaged parts are connected to form girdling, the whole tree can die.

[control] large seedlings of Pinus elliottii transplanted should be selected in the stand where there is no red resin bark beetle, and aluminum phosphide standing wood fumigation can be used when sporadic Pinus elliottii trees are found in the forest. If the number of harmful plants is large and the symptoms are mild, botanical attractants can be used to control the disease.

Dendroctonus japonicus

Longitudinal pit bark beetle belongs to Coleoptera bark beetle family, which is a pioneer species of secondary pests. It lives concealed in tree trunks and new shoots for most of the year, resulting in tree weakness, death of new shoots and limited crown expansion. It is difficult to cultivate tree shape, and pine trees die when the density of insect population is high.

[prevention and control] it is necessary to cut off the damaged branches and dead shoots in time, and when the branches wither due to supplementary nutrition of overwintering adults and new Eclosion adults, they should be cut off and burned in time. Before the adults invade the new shoots, spray the crown with 1000 times of 80% dichlorvos EC or 1000 times of 50% phosphoramines EC to 1500 times, maintain good sanitary conditions in the nursery, cut down dying trees and burn them in time.

Pine aphid

The pine aphid belongs to the family Homoptera, and its host is mainly pine, which mainly harms needles, tender shoots, young trees or trunks. When the population density is high, the whole tree dies or the growth of lateral branches is seriously affected. Light pine needles are withered and yellow, dry tip, serious green loss, no new shoots. No matter how light the pine needles are, the color of the needles does not change much, but the shoot growth is less than 50% of the normal. In particular, the dense insect bodies of twigs secrete a large amount of honey and flow down the branches, causing the occurrence of coal fouling disease and weakening growth.

[control] it can be controlled by natural enemies such as aphids, gadflies, ladybugs and so on. The chemical method is to spray 10% imidacloprid 1000 times to 1500 times in mid-April.

Chilo suppressalis

The adults of Chilo suppressalis are quiescent during the day and active at night, laying eggs at the base of young needles or leaf sheaths, and can also be scattered in the grooves of yellow needles, injured cones and bark wounds in the same year. The first instar larvae look for new shoots, gnawing on the shoot skin to form a finger-sized scar, and then gradually eat into the core of the pulp, the mouth of the decay is round, and there are a lot of decay chips and feces accumulation.

[prevention and control] cut off the injured shoots in winter, burn them centrally, and eliminate overwintering larvae and pupae. Spray 50% chrysanthemum EC 1000 times to 1 500 times or 2000 times Lindebao wettable powder every 10 days to control Trichogramma.

Loose needle disease

Pine needle disease mostly overwinters in mycelia or ascomycetes on ground needles, some overwinters on needles on trees, and forms ascomycetes to mature in March or April of the following year. Ascospores are produced in April or May. In case of rain or wet conditions, ascospores are emitted by water absorption and expansion. Can be spread by airflow, invade from stomata, incubation period 1 to 2 months or more. Generally infect 2-year-old needles, later can infect current year-old needles, Pinus elliottii of different ages can be damaged, resulting in needles withered and yellow and early fall, serious trees are on the verge of death.

[prevention and control] it is necessary to strengthen the management of water and fertilizer in the nursery, strengthen the tree potential, control other diseases and insect pests in time, and cut down weak and dying trees. Before the peak of sporozoite emission in spring and summer, spray 1purl 100 Bordeaux solution, 50% acetaminophen 500-800 times, 70% dimethazone 500-800 times, 65% zinc 500 times, 45% benzoyl 200-300 times, canopy young forests or seriously sick adult forests can release 621 smoke agents and chlorothalonil smoke removers.

Pine needle red tangerine disease

[harm] Pine needle damage is yellow spot at first, gradually brown, and finally gray or dark gray. The lesion is slightly sunken, and there are often dark red circles at the junction with healthy tissue. The disease part is scattered with black spots, that is, the conidium disk of the pathogen, the disease spot can appear in different positions of the needle, and the parts above the disease spot often die and fall, mainly with leaf tip death. When the damage is serious, the injured trees seem to burn and lose their leaves early, which seriously affects their growth and ornamental, and causes disease for several consecutive years, resulting in plant death.

[prevention and control] strengthen woodland management, enhance tree potential, improve tree disease resistance, remove weeds under the forest in time, enhance the drainage of woodland, and avoid excessive humidity of woodland. Drug control can use 25% carbendazim or 75% chlorothalonil wettable powder 500 times liquid spray.

Brown spot disease

[harm] at first, discolored spots appeared on the diseased leaves, showing straw yellow or light yellow, mostly round or nearly round, then brown, slightly enlarged into segments, and soon gray-black vesicles were produced in the diseased spots. The disease spots of most diseased leaves are obviously divided into three segments, the upper part browns and dies, the middle part brown spot alternates with the green healthy tissue, and the lower part is still green. The new tender leaves infected with the needle leaf apex quickly turn brown and die, and sometimes below the dead part, the disease begins to occur from the base of the crown and gradually extends to the upper part. For the seriously ill pine, only part of the green leaves were preserved at the top of the top two or three rounds of branches, and soon the whole tree withered.

[prevention and control] strengthen forest management, remove diseased leaves in time, build a mixed forest, and spray with 25% carbendazim or 75% chlorothalonil 500 times solution for drug control.

Pine red leaf disease

The harm often occurs on the needles of the same year, and is often mixed with needle diseases such as red blight and falling needles. the symptoms are easy to be confused and the infection is strong, which can accelerate the development of physiological yellowing disease of pine trees, lead to the stagnation of tree growth, and the new shoots and needles are getting shorter and shorter. And then gradually died.

[prevention and control] remove dead and seriously diseased plants, strengthen tree management, and enhance tree potential. Drug prevention and treatment with 100 to 150 times Bordeaux solution spray or 65% wettable Zinc 500 times solution spray.

Coal pollution disease

[harm] Coal fouling disease is harmful to leaves, and sometimes to branches. Nectar sticky droplets begin to appear in the affected parts, and loose spots gradually appear, and then they are connected into pieces to form a hard black mold layer, which is not easy to fall off. Caused by a variety of coal fouling bacteria, these bacteria are mainly parasitic on the feces and secretions excreted by aphids and shell insects, so the white bark pine provides nutrition for the coal fouling bacteria and is the direct cause of the disease. In addition, shade, high humidity, poor ventilation and poor light transmission are easy to occur.

[control] the best measure is to control aphids, shell insects, whitefly and other pests, pruning properly to facilitate ventilation, light transmission, enhance the tree potential, reduce the disease, and spray 0.3 Baume stone sulfur mixture when the disease is serious.