The latest course of pest control techniques of Pinus elliottii

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.