Phylogeography of the bark beetle Dendroctonus mexicanus Hopkins ( Coleoptera: Curculionidae: Scolytinae). Anducho-Reyes MA(1). ABSTRACT: The Mexican pine beetle (XPB) Dendroctonus mexicanus, is recorded here for the first time as a new introduction for the United States (US). Semiochemicals of Dendroctonus mexicanus, the Mexican pine beetle. Phylum: Arthropoda. Subphylum: Uniramia. Class: Insecta. Order: Coleoptera. Family.

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Add comment Close comment form modal. His report La Plaga de Ocotes which was not published untildescribed the aspects of the dead trees and the insects and their work. On the other hand Dr. This structure can be analyzed with respect to the biogeographic pattern that describes the species in a region. The only mexicahus pines on which the attack was observed were determined by Prof. Adults of small chalcids were found in rearings of D.

It was during this period of suppressed growth that the present bark beetle epidemics occurred.

EPPO Global Database

As the eggs hatch, the minute larvae mine outward into the phloem at right angles to the main tunnel. A characteristic feature of these small killed areas is the few isolated surviving trees left on the fringes. However, the attack did not end in these isolated stands; a sudden outbreak, approximately 5 acres 2 ha.

Table mexivanus is based on counts of the entrance and exit holes in bark areas, selected at random upon two killed trees representing both species of pine. The adult insect as described by Hopkins averages 3.

Dendroctonus mexicanus (DENCME)[Overview]| EPPO Global Database

Pine bark beetles of Central Mexico by J. Bonansea sent specimens of the insects collected in these areas to Dr. In either case felling the tree before treatment of the bark is of advantage, and where burning is used, peeling the bark from the log is desirable.


Results show that heterozygosity of D. Destruction of wood by fungi proceeding rapidly.

Direct Control The methods used for the direct control of D. A report by Dr. Genetic structure was determined using the relationship between F ST versus geographic distances among populations.

Following the dendtoctonus and secondary invasions, Ips bonanseai attacks the top portion of the tree. A number of predatory beetles were found in and around the trees infested by D. Many of the attacking adults are trapped mexicwnus rapid drying of the pitch and die in the pitch tube without gaining entrance to the tree. When the resin flow ceases, the tunnel is curved sharply and extended down and around the stem in a winding, elongated “S” shaped pattern.

We explored whether the population genetic structure of D. Your comment will be reviewed and published at mexidanus journal’s discretion. Group attacks Group behavior of D. Dendrogram reliability was assessed by bootstrap analysis and cophenetic correlation coefficient by using the Mantel test. In other instances, particularly in large stands of pine, group infestations were observed on a much larger scale.

The primary attack by D. The new adults mine directly outward from the pupal cell through the bark and emerge completely developed and capable of immediately initiating a new attack on living pines. As the larvae mature, a pupal cell is constructed in the phloem and the pupal period is passed in this cell. The complete invasion of the stem by this species mexicxnus requires 7 to 10 days.

In that year Dr. It was in a number of these stands that rendroctonus writer was able to follow in considerable detail the progress and development of the insect. Mexicanus Control experiments were not attempted in these studies as time was available only for collecting biological and ecological data. Burks of the U. Although these predators are present in numbers, their control effect has obviously been insufficient to check the rapid increase of the bark beetle in recent epidemics.


You must accept the terms and conditions. Department of Agriculture 4. Martinez as Pinus montezumae and P. Twelve gene loci were analyzed by isozyme electrophoresis in 17 deendroctonus found on pines from the Leiophyllae subsection. The adults attack the living tree in force but each individual entrance in the bark represents the work of a pair of beetles, generally with the female actually excavating the tunnel entrance.

Wood-peckers working on Ponderosa pines mfxicanus by Dendroctonus brevicomis have been found to account for as high as 75 percent of the broods. Close mobile search mecicanus Article navigation. Judging from the size of the present beetle-killed areas, the timber losses during these years in this locality must have been tremendous. Male Dendroctonus mexicanus working the pitch flow in order to keep tunnel and entrance open.

The writer has also recorded mexicannus successful attacks as occurring during these coldest months.

It can be seen msxicanus the data on the developmental period that it is possible to obtain four generations of insects per year. From this point the infestation extends down the stem to a distance approximately 18 in.

Average Development of Dendroctonus mexicanus. The habits of dendroconus species have not been fully described in previous publications, so are covered in some detail. Rinehart; Genetic Structure of Dendroctonus mexicanus Coleoptera:

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