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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Oxford University Press is a department of the University dendrkctonus Oxford. In other instances, particularly in large stands of pine, group infestations were observed on a much larger scale.

Abstract It is assumed that geographic isolation of Dendroctonus Erichson species populations or their plant hosts determines genetic structure. Because of this, infestations have run unchecked in the forested areas of ejidal lands.

Adults of the above species were observed feeding on the adults of D. You must accept the terms and conditions. Replanting of these clear cut areas with more resistant mexkcanus, such as P. Adults of small chalcids were found in rearings of D.

A publication by Donald De Leon lists, with descriptions and host references, a number of the bark beetle species that attack pines in Mexico.

It can be seen from the data on the developmental period that it is possible to obtain four generations of insects per year. No Trees in which Brood Development was followed. Control through forest management Regulated cutting and management of pine stands may offer the best solution for prevention of outbreaks of D. Table 2 indicates the length of time required for the most important color changes: However, no woodpecker work has been found in connection with the infestations of D.

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. In some cases groups of large size appeared suddenly in areas where no previous attacks had occurred. The writer has recorded tunnel length of 13 to 16 in cm.


The spread of a number of infestations in small isolated stands was followed in considerable detail and in every instance the pattern was the same. Sign In or Create an Account. This insect is well known throughout the United States, and its habits have been recorded in bulletins of the U. There is no evidence, however, that birds have played any such role in recent outbreaks.

Some trees of Pinus montezumae var. In fact, if we allow two parent adults to each entrance hole, the number of beetles attacking per square foot in var. In the course of intermittent field trips from Mexico City, it has been possible to acquire meexicanus understanding of the habits of three species of bark beetles, their interrelationships, the manner in which they attack and kill living trees, and the extent to which they may destroy certain stands of pine.

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

He also included many observations on the general features of the infestation and suggested various control measures.

Differences in Character of Pitch Tubes. Sylvio Bonansea refers to large infestations of D. However, it was noted that infestations occurred during the coldest months of the year which suggests the absence of a dormancy period in the life cycle.

Where the land was privately owned, it was possible to get the owners to provide the labor to cut, limb and peel the dendroctonud trees. Department of Agriculture 4. This species only invades the tree after the attacks of D. Dendroconus structure was determined using the relationship between F ST versus geographic distances among populations. This structure can be analyzed with respect to the biogeographic pattern that describes the species in a region. This evidence suggests that in the even-aged stands of P.


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His report La Plaga de Ocotes which was not published untildescribed the aspects of the dead trees and the insects and their work. Many of the attacking adults are trapped by rapid drying of the pitch and die in the pitch tube without gaining entrance to the tree. These results indicate that eradication work on D.

Allele frequencies, average heterozygosity, heterozygosity by locus, deviations from Hardy—Weinberg equilibrium HWEF-statistics among populations, and average genetic flow were calculated.

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. The author has photographed patches of wheat growing among the stumps of pines that had been killed by D. Wood-peckers working on Ponderosa pines infested by Dendroctonus brevicomis have been found to account for as high as 75 percent of the broods.

Schwerdtfeger, have been investigating similar bark beetle epidemics in Guatemala. No effort was made to determine the average length of time required to complete the life cycle of this insect.

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

All photographs were taken by the author; Byron MacLellan, Photographer for the Rockefeller Foundation, made the necessary prints and enlargements. It is assumed that geographic isolation of Dendroctonus Erichson species populations or their plant hosts determines genetic structure.

Mirov shows that the oleoresin from Dendroctonuw.