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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EPPO Global Database

National Museum as Pachyceras sp. The adult insect as described by Hopkins averages 3. This gives the insect a tremendous biotic potential – particularly since no true period of dormancy was observed during its life cycle. I agree to the terms and mexicanuw.

Unasylva – Vol. 5, No. 4 – Pine bark beetles of Central Mexico

Where the land was privately owned, it was possible to get the owners to provide the labor to cut, limb and peel the infested trees. In that year Dr. From this material Hopkins described Dendroctonus mexicanus Hopk. In some cases groups of large size appeared suddenly in areas where no previous attacks had occurred. This difference in the character of the pitch tubes is due to differences between the chemical components of the oleoresins produced by the two species of pines.

The declivity of the elytra is excavated and each side is armed with four short acute teeth. As the forest gradually changes with increasing preight from predominantly P. This habit has been studied in a closely related species in California, D. Several large infestation centers were treated in this way. These consist of burning the infested bark to destroy the insects, or of spraying the bark with penetrative toxic oils until it is well saturated.


It can be seen from the data on the developmental period that it is possible to obtain four generations of insects per year. The eggs are placed in niches alternately along both sides of the tunnel.

Frass is packed around each egg in its niche but the egg-galleries and nuptial chamber are kept open at all times. Close-up of inner bark showing detail of egg galleries and early larval burrows of Edndroctonus mexicanus. The complete invasion of the stem by this species generally requires 7 to 10 days.

Table 3 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. No effort was made to determine the average length of time required to complete the dendroctonis cycle of this insect. Your comment will be reviewed and published at the journal’s discretion.

Sylvio Bonansea refers to large infestations of D. The owners were permitted to sell the wood which paid for costs of the operation.

After the initial attack by D. On the northern and north-eastern exposures cedars Cupressus benthamii Endl.

Egg laying proceeds as follows: At higher elevations the two latter pines become more evident and fir Abies religiosa begins to appear and increases in numbers with the increase in elevation. Adults of the above species were observed feeding on the adults of D.

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

When these same areas were examined one year later, no new attacks were found around the areas that had been treated. Epidemics are less aggressive where P. As the larvae mature, a pupal cell is constructed in the phloem and the pupal period is passed in this cell. 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.


At first a small group of trees was heavily attacked, then the adjoining trees were rapidly invaded until a center of infestation including 10 to 20 or more trees was established. The writer has also recorded numerous successful attacks as occurring during these coldest months.

Dendroctonis smaller tees or trees with many low branches, the attack is generally started in the area where the first branche occur. On the other hand Dr.

Because of this, infestations have run unchecked in the forested areas of ejidal lands. In every instance the attack was observed to occur only when the foliage of the pine had started to wilt or approximately 20 days after the invasion of the stem by D. The writer has recorded tunnel length of 13 to 16 in cm.

In no instance was there observed a dendrctonus of this sequence of attack. Life history of Dendroctonus mexicanus The bark beetle primarly responsible for the extensive kills in these areas is Dendroctonus mexicanus.