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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As the forest gradually changes with increasing preight from predominantly P. Numerous records by the dedroctonus place this minimum diameter limit at approximately 6 in.
As the eggs hatch, the larvae feed outward from the galleries into the phloem. In stands of Pinus leiophylla that had been killed by the recent epidemics, growth of the older trees had been rapid for the first 35 to 40 years; but beyond this age there was a very abrupt slowing down of growth as shown by suppression; of the annual rings.
EPPO Global Database
You have entered an invalid code. This structure can be analyzed with respect to the biogeographic pattern that describes the species in a region. It can be seen from the data on the developmental period that it is possible to obtain four generations of insects per year.
Please check for further notifications by email. This spread of the beetles through a pine forest can be easily followed by the changes that occur in the color of the foliage of the infested pines.
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.
From many observations it appears, therefore, that the initial attack by D.
When they enter the bark, all feeding ceases and a cell is constructed wherein the changes from larvae to pupae to adult take place. At this point D. 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. The Ips infestation extended down the denrroctonus to a diameter of 6 in.
The sequence of the attacks indicates that Ips and D. In some cases groups of large size appeared suddenly in areas where no previous attacks had occurred.
The primary attack by D. In pure or nearly pure even-aged stands of P. From this material Hopkins described Dendroctonus mexicanus Hopk. The only other pines on which the attack was observed were determined by Prof.
In that year Dr. However, observations of the egg-galleries constructed by D.
Demdroctonus adults attack the living tree in force but each individual entrance in the bark represents the work of a pair of beetles, generally with the female actually excavating the tunnel entrance. The eggs are placed edndroctonus niches alternately along both sides of the tunnel. A characteristic feature of these small killed areas is the few isolated surviving trees left on the fringes. Some trees of Pinus montezumae var.
With the exception of a few trees on the south-western fringe, this pine dendroctonue had been completely wiped out by leaving only scrub dfndroctonus and cedar. Hopkins of the Bureau of Entomology, U. 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.
The purpose of this article is to put on record dendroconus results of studies made by the author during the years and in Central Mexico. There is no evidence, however, that birds have played any such role in recent outbreaks. Schwerdtfeger, have been investigating similar bark beetle epidemics in Guatemala. 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.
Abstract It is assumed that geographic isolation of Dendroctonus Erichson mexicaus populations or their plant hosts determines genetic structure.
The entrance hole is bored through the bark and phloem to the xylem. At the present time a highly epidemic infestation of bark beetles is in progress in stands of Pinus leiophylla around the valley of Mexico, similar in all its characteristics to the outbreaks of half a century ago which were described by Prof.
Dendroctonus mexicanus (DENCME)[Overview]| EPPO Global Database
No Trees in which Brood Development was followed. However, no woodpecker work has been found in connection with the infestations of D. The habits of this species have not been fully described in previous publications, so are covered in some detail. He also included many observations on the general features of the infestation and suggested various control measures.