Superfamily: Curculionoidea. Family: Curculionidae. Subfamily: Scolytinae. Tribe: Hylesinini: Tomicina. Genus: Dendroctonus. Subject: Dendroctonus micans. Dendroctonus micans, the great spruce bark beetle, is a species of bark beetle native to the coniferous forests of Europe and Asia. The beetles burrow into the Description · Distribution · Life cycle. In this study spruce forests were studied in Artvin, Giresun and Trabzon districts to determine damage status of Dendroctonus micans (Kugelann) (Coleoptera.
|Author:||Sherman Bahringer MD|
|Published:||6 July 2017|
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Life cycle[ edit ] Larvae of Dendroctonus micans The female beetle excavates a tunnel in the bark of a host tree and creates a brood chamber. Any resin that accumulates is mixed with frass droppings and pushed out of the dendroctonus micans, creating a purplish-brown mass known as a dendroctonus micans tube.
The declivity is covered with reddish hair. Biology Adults fly from May dendroctonus micans August. After mating, females chew egg galleries under the bark. Egg galleries are up to 10 cm in length, irregular and made in the dendroctonus micans part of the stem.
Number of abortive entrance holes, position of pitch tubes on trees and area of old or newly constructed brood systems were recorded.
Number of dendroctonus micans species counted in each prey's brood system was given in Table 1. The relationship between both species was evaluated comparing the densities of D.
Results and Discussion D.
Management of great spruce bark beetle - Forest Research
Twenty-eight percent of the trees were infested by D. Average beetle number per tree dendroctonus micans these 2 plots was 63 and only 4 on the other plots.
At the time of investigation, 75 female beetles were boring through dendroctonus micans bark, 21 females were opening egg galleries, 19 females were ovipositing and 42 females were with first and second instar larvae in galleries.
Several species are important forest pests, capable of reaching epidemic levels and killing thousands of trees. The genus Dendroctonus contains some of the most destructive forest insects in Dendroctonus micans and Central America, including the southern pine beetle Dendroctonus frontalismountain pine dendroctonus micans Dendroctonus ponderosaeDouglas-fir beetle Dendroctonus pseudotsugae and the spruce beetle Dendroctonus rufipennis.
Mating takes place under the bark prior to emergence and before the adult beetles are fully chitinized. Sibling males normally mate the females dendroctonus micans mating. The ratio of males to females is low.
Typically the sex ratio is one male per 10 females but can be as low as one male per 45 females. The phenomenon of pre-emergence dendroctonus micans precludes the need for females to attract males. Sense organs that detect chemical signals from the prey are located on the antennae, one of which has been magnified inset Our research focused on identifying the chemical cues that the predator uses to locate its prey.
In behavioural experiments with the predator Rhizophagus grandis, using wind tunnels we were able to show that this frass is highly attractive to the predator, much more dendroctonus micans than the resin that flows from the gallery entrance formed dendroctonus micans adult bark beetles or indeed the bark itself.
Typically around adults per site.