DENDROCTONUS MEXICANUS PDF

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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Egg laying proceeds as follows: Genetic structure was determined using the relationship between F ST versus geographic distances among populations. 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. Sign In or Create an Account.

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 mezicanus pine. The author has photographed patches of wheat growing among the stumps of pines that had been killed by D. Dorothy Parker, Botanist for Rockefeller Foundation Agricultural Program in Mexico for reading the manuscript and offering many helpful suggestions; to Dr.

The only other pines on which the attack was observed were determined by Prof. The forester of the Unidad marked the trees to be cut and supervised the burning of the infested limbs and tops. There is no evidence, however, that birds have played any such role in recent outbreaks.

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His report La Plaga de Medicanus which was not published untildescribed the aspects of the dead trees and the insects and their work. 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. The new adults work their way through the old frass that was once phloem tissue, to the old galleries and emerge through the entrance and ventilation holes.

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Numerous records dendroctinus the author place this minimum diameter limit at approximately 6 in. Add comment Close comment form modal. Judging from the size of the present beetle-killed areas, the timber losses during these years in this locality must have been tremendous.

Group attacks Group behavior of D. This mass flight covered a distance of approximately 5 miles 8 km.

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

This difference in the character sendroctonus the pitch tubes is due to differences between the chemical components of the oleoresins dendrocronus by the two species of pines. In other instances, particularly in large stands of pine, group infestations were observed on a much larger scale.

These consist of burning the infested bark to destroy the insects, or of spraying the bark mexicanux penetrative toxic oils until it is well saturated. In some cases groups of large size appeared suddenly in areas where no previous attacks had occurred. 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. Differences in Character of Pitch Tubes. 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.

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

At higher mexicans the two latter pines become more evident and fir Abies religiosa begins to appear and increases in numbers with the increase in elevation. Bonansea found that bark beetles were the primary cause of the trouble. The females deposit their eggs in niches spaced alternately along the sides of the galleries.

In all the literature that is available there is very dehdroctonus information about the life history and habits of the insects, their host relationships or the causes of the aggressive outbreaks that are characteristic of the infestations.

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However, observations of the egg-galleries constructed by D.

EPPO Global Database

This structure can be analyzed with respect to the biogeographic pattern that describes the species in a region. Schwerdtfeger, have been investigating similar bark beetle epidemics in Guatemala.

As the larvae mature, a pupal cell is constructed in the phloem and the pupal period is passed in this cell. On the northern and north-eastern exposures cedars Cupressus benthamii Endl.

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. I agree to the terms and conditions. Department of Agriculture 4. For this reason control efforts can be concentrated on D. With the exception of a few trees on the south-western fringe, this pine forest had been completely wiped out by leaving only scrub oak and cedar.

From this material Hopkins described Dendroctonus mexicanus Hopk. 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.

The sequence of the attacks indicates that Ips and D. In the latter variety, which is often present in mixed stands with P. Mexicxnus of inner bark showing detail of egg galleries and early larval burrows of Dendroctonus mexicanus. We explored whether the population genetic structure of D. For commercial re-use, please contact journals.