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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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. In Hopkins described the adults of this species as averaging 3. Results show that heterozygosity of D. The eggs are placed in niches alternately along both sides of the tunnel.

As the eggs hatch, the minute larvae mine outward into the phloem at right angles to the main tunnel. There is also apparently no true period of dormancy in its life cycle in this area, since attacks were commonly found occurring during all months of the year.

Destruction of wood by fungi proceeding rapidly. Burks of the U. Pine bark beetles of Central Mexico by J. As the first generation brood emerged, they immediately attacked the surrounding living trees and in a comparatively short period of time a forest covering several hundred acres was completely infested. However, some information on both natural and artificial control of the beetle is available and will therefore he included here.

Abstract It is assumed that geographic isolation of Dendroctonus Erichson species populations or their plant hosts determines genetic deneroctonus. Hopkins of the Bureau of Entomology, U. The females deposit their eggs in niches spaced alternately along the sides of the galleries. A dendroctojus of the number of entrance holes, each 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.


It was in a number of these stands that the writer was able to follow in considerable detail the progress and development of the insect. As they increase in size, they gradually feed toward the outer, dry bark, attaining their maximum size as they reach the outer bark. The new adults mine directly outward from the pupal cell through the bark and emerge completely developed and capable jexicanus immediately initiating a new attack on living pines.

Bonansea found that bark beetles were the primary cause of the trouble. On the northern and north-eastern exposures cedars Cupressus benthamii Endl.

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.

This habit has been studied in a closely related species in California, D. Direct Control The methods used for the direct control of D. His report La Plaga de Ocotes which was not published untildescribed the aspects of the dead trees and the insects and their work.

Wood-peckers working on Ponderosa pines infested by Dendroctonus brevicomis have been found to account for as high as 75 percent of the broods. Characteristic form of gallery made by adult beetles in Pinus leiophylla. Close mobile search navigation Article navigation.

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

From the entrance the tunnel is excavated vertically up the trunk for a short distance, allowing the pitch to flow freely from the entrance hole. Mexicanus Control experiments were not attempted in these studies as time was available only for collecting biological and ecological data.


Even during the coldest months of the year – November, Dendroctonux and January – temperatures during the middle of the day were high enough to insure some feeding and development of larvae. Egg laying proceeds as follows: The Ips infestation extended down the stem to a diameter of 6 in.

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

mexucanus The habits of this species have not been fully described in previous publications, so are covered in some detail. In that year Dr. In pure or nearly pure even-aged stands of P. Tree now fallen to ground. This gives the insect a tremendous biotic potential – particularly since no true period of dormancy was observed during its life cycle. Martinez as Pinus montezumae and P.

As long as there are sufficient living pines in the larger infestation centers, the insects apparently merely spread out from the original group kill.

In no instance was there observed a reversal of this sequence of attack. Average Development of Dendroctonus mexicanus.

EPPO Global Database

The Unidad Forestalhowever, maintains a forest nursery and is replanting some of the devasted areas. Sylvio Bonansea refers to large infestations of D. From this material Hopkins described Dendroctonus mexicanus Hopk. You have entered an invalid code. 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. The declivity of the elytra is xendroctonus and each side is armed with four short acute teeth.