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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It is believed that these large spontaneous infestations are the result of mass flights of insects from an infested area where the number of living trees is no longer sufficient to afford hosts for the tremendous population of emerging beetles. A high proportion of loci were out of HWE by homozygous excess, which may be explained by multiple factors.

When they enter the bark, all feeding ceases and a cell is constructed wherein the changes from larvae to pupae to adult take place. When the resin flow ceases, the tunnel is curved sharply and extended down and around the stem in a winding, elongated “S” shaped pattern.

Adults of the above species were observed feeding on the adults of D. The pitch flow produced by Dendroctonus mexicanus attacks on Pinus leiophylla The pitch flow produced by Dendroctonus mexicanus attacks on P.

A number of these larger infestations covered from 5 to 10 or more acres ha. The large group outbreak in near San Rafael is believed to have occurred in this manner when the emerging beetles in the infested forest near Amecameca no longer found enough living host trees nearby. National Museum as Pachyceras sp. These were determined by Dr. The beetle is now spreading up the pine forested slopes of this mountain range and only a rough estimate can be made of the number of acres of trees that will be destroyed.


Mfxicanus some cases groups of rendroctonus size appeared suddenly in areas where no previous attacks had ,exicanus. Bonansea mentioned that the reduction of predatory and parasitic insect populations by birds was one of the reasons for the epidemic bark beetle outbreaks.

Full grown larva and young adult in cells in outer hark of Pinus leiophylla. The sequence of the attacks indicates that Ips and D.

In Hopkins described the adults of this species as averaging 3. Information obtained from the local population dates the beginning of the present epidemic et about and the “peones” questioned were unanimous in locating the first outbreak as occurring on the slopes of a small mountain a few miles west of the town of Amecameca.

We explored whether the population genetic structure of D. Dorothy Parker, Botanist for Rockefeller Foundation Agricultural Program in Mexico for reading the manuscript and offering many helpful suggestions; to Dr. Wood-peckers working on Ponderosa pines infested by Dendroctonus brevicomis have been found to account for as high as 75 percent of the broods.

You must accept the terms and conditions. Epidemics are less aggressive where P. Thank you for submitting a comment on this article. A comparison of the number of entrance holes, vendroctonus of which represents the attack of a pair of parent beetles, and of the exit holes which represent the emergence of their progeny, will illustrate this difference.

Tree now fallen to ground. However, the attack did not end in these isolated stands; a sudden outbreak, approximately 5 acres 2 ha. However, dendroctnus was noted that infestations occurred during the coldest months of the year which suggests the absence of a dormancy period in the life cycle. As long as there are sufficient living pines in the larger infestation centers, the insects apparently merely spread out from the original group kill.


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

This insect is well known throughout the United States, and its habits have been recorded in bulletins of the U. Burks of the U. The entrance hole is bored through the bark and phloem to the xylem. It was found from a number of egg counts that the female deposits an average of 6 eggs per inch 2. From this point the infestation extends down the stem to a distance approximately 18 in.

EPPO Global Database

From many observations it mexicaus, therefore, that the initial attack by D. 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. Add comment Close comment form modal. I agree to the terms and dendrooctonus.

This may very well be due to the great scarcity of the birds, which through lack of protection seem to be approaching extermination in these areas.

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

Dendroctous 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.

This habit has been studied in a closely related species in California, D. Table 2 indicates the length of time required for the most important color changes: Rinehart; Genetic Structure of Dendroctonus mexicanus Coleoptera: His report La Plaga de Ocotes which was not published until meixcanus, described the aspects of the dead trees and the insects and their work.