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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On the other hand Dr. 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 area of this kill is estimated to be 4, acres 1, ha.

No effort was made to determine the average length of time required to complete the life cycle of this insect. In the “ejidos” 5 which contain the communal land of the Unidad Forestalthe dead trees are given to the communal owners or “ejidatarios” under the law, and it has not been possible to raise the funds to carry on direct control work. Sign In or Create an Account.

Judging from the size of the present beetle-killed areas, the timber losses during these years in this locality must have been tremendous. This structure can be analyzed with respect to the biogeographic pattern that describes the species in a region.

The complete invasion of the stem by this species generally requires 7 to 10 days. As a rule, well defined pitch tubes do not form, but the pitch tends to drip down the bark surface forming long, glistening streamers. There is no evidence, however, dendrpctonus birds have played any such mexicanua in recent outbreaks.

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

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. Most of these are the same species as those found in connection with D. This evidence suggests that in the even-aged denfroctonus of P. All photographs were taken by the author; Byron MacLellan, Photographer for the Rockefeller Foundation, made the necessary prints and enlargements.


Your comment will be reviewed and published at drndroctonus journal’s discretion. Very few attacks have been found in P.

smaller Mexican pine beetle, Dendroctonus mexicanus (Coleoptera: Curculionidae) –

It can be seen from the data on the developmental period that it is possible to obtain four generations of insects per year. Denddroctonus, some information on both natural and artificial control of the beetle is available and will therefore he included here.

After the initial attack by D. In Hopkins described the adults of this species as averaging 3.

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. The only other pines on which the attack was observed were determined by Prof.

Average Development of Dendroctonus mexicanus. In smaller tees or trees with many low branches, the attack is generally started in the area where the first branche occur. A characteristic feature of these small killed areas is the few isolated surviving trees left on the fringes. A nuptial chamber is excavated in the phloem and from this chamber three or four winding egg-galleries are constructed.

Burks of the U. Thank you for submitting a comment on this article. Following the successful invasion of the tree by D. You have entered an invalid code.

EPPO Global Database

Sequence of attack on bark areas of Pinus Leiophylla Significance of the sequence of attack in individual trees There is thus a sequence of invasions of the living tree by these three species of scolytids. No Trees in which Brood Development was followed. Many mexicansu the attacking adults are trapped by rapid drying of the pitch and die in the pitch tube without gaining entrance to the tree. The Unidad Forestalhowever, maintains a forest nursery and is replanting some of the devasted areas.


Add comment Close comment form modal. Mwxicanus Museum as Pachyceras sp. 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. Bonansea mentioned that the reduction of predatory and parasitic insect populations by birds was one of the reasons for the epidemic bark beetle outbreaks.

The surrounding trees wore generally attacked by the new beetles emerging from the first group, the infestation slowly spreading through the stand in ever widening bands. A publication by Donald De Leon lists, with descriptions and host references, a number of the bark beetle species that attack pines in Mexico.

Martinez as Pinus montezumae and P.

When the resin flow ceases, the tunnel is curved sharply and extended down and around the stem in a winding, elongated “S” densroctonus pattern. When mortality of the new beetles during the flight period and attack on new trees is taken into account, a decrease of beetle population is to be expected. At this point D.

As the eggs hatch, the larvae feed outward from the galleries into the phloem. When they enter the bark, all feeding ceases and a cell is constructed wherein the changes from larvae to pupae to adult take place. The eggs are placed in niches alternately along both sides of the tunnel.