Spruce bark beetle

Ipstypographus Linnaeus belongs to Coleoptera family. It distributes in Northeast China, Inner Mongolia, Sichuan and Xinjiang. It mainly injures Picea asperata and Pinus koraiensis. It is a destructive pest in some Picea asperata forests.

The damage characteristics build pits between phloem and sapwood of pine trees. The tunnels are compound longitudinal pits. They can also directly damage healthy trees, often occurring together with other small beetles, resulting in the death of trees.

morphological characteristics

Adult body length 4.0-5.5mm, dark brown, shiny, brown hair. The forehead has coarse grains, and the upper part of the central mouthpart of the lower part of the forehead has a tumor-shaped large protrusion. The middle part of the pronotum has rough ruffles, the rear part is smooth without incised points, the rear part of the elytra is inclined, the two sides of the inclined plane have four teeth, the third is button-shaped, the other three are conical, the four teeth are separated independently, and the distance between the first and second teeth is the largest. The slope was dull and lathered. The slope is the same between the sexes.

The egg is oblong, about 1.0mm long and 0.7mm wide, milky white.

Larvae length 4.0-6.3mm, curved body, ruffled, setose, milky white. Similar to larch bark beetles.

The upper jaw and forewing tips of pupae turn brown before emergence. It is milky white and has two spiny projections at the end of its abdomen.

It overwinters as adults at the base of larch trunk or under litter layer, and a few overwinters under dead young trees or in old tunnels. Life history is irregular, in the second year in the middle and late May, adults can invade the trunk after 1-2 days to lay eggs, egg stage about 14 days, larval stage about 22 days, pupal stage about 12 days. Newborn adults stay under the bark for nearly one month, up to two months, before drilling emergence holes. Double tunnel, tunnel is not too long, generally about 7cm, tunnel adults are generally 1 male and 3 female. There are more than 30 egg chambers, each egg chamber has only one egg. The mature larvae build a pupa chamber at the end of the daughter tunnel. Each stage can be found almost in the whole growth period. The insect likes ventilation and light transmission, but does not like direct sunlight and extreme shade environment, so it mainly distributes in the middle and lower parts of the trunk, and mixes with larch beetle on larch.

control methods

1) Agricultural control.

Create mixed forest, combine tending and felling, strengthen tree vigor; pay attention to forest hygiene, remove pest trees and broken trees; under the premise of good sanitary conditions, cut small diameter trees in the middle of April, set bait trees to trap and kill, and then conduct peeling treatment in the same way.

(2) Protect natural enemies such as walking insects, parasitic bees and woodpeckers.

(3) Chemical control.

From the end of May to the beginning of July, during the peak period of adult flight invasion, spray the branches of living trees with 2.5% enemy killing ointment 200 times or 30% cypermethrin poison ointment 500 times to control adults.

Commonly used agents enemy kill, cypermethrin.