Bark beetles can destroy 20 thousand hectares of spruce in the Moscow region in 2011

Community and Forum → Insects biology and faunistics → Bark beetles can destroy 20 thousand hectares of spruce in the Moscow region in 2011

amara, 21.04.2011 20:25

About 20 thousand hectares of spruce will die in the Moscow region from bark beetles, if May is warm, said RIA Novosti on Thursday, Deputy Director of the federal state institution "Russian Center for Forest Protection" Alexey Bobrinsky.
The bark beetle is a common background species in the forests of the Moscow region.It can only be absent in isolated parks of the megalopolis. The" settling " of spruce by a typographer (a beetle of the bark beetle family) in almost 100% of cases is associated with the subsequent drying of the tree. According to the biologist, in the last few years, the bark beetle ate no more than 1 thousand hectares of forest per year. In the previous "outbreak" after the 1998 windstorm, it ate 5-6 thousand hectares a year.
"In normal weather "not cold-not hot", but with at least one warm week in May, we expect that on the lands of the forest fund of the Moscow region in 2011, the Christmas tree will die with the participation of a typographer and other bark beetles on an area of about 20 thousand hectares, "said the deputy director of the Federal State Institution"Roslesozashchita".
According to the biologist, outbreaks of typograph reproduction are clearly timed to droughts. The reason for the current extremely strong reproduction is the abnormal heat of the summer of 2010 in the Moscow region and Central Russia. In autumn, almost every tenth spruce tree older than 60 years was more or less populated by bark beetles in the Moscow region.
"The cold weather in April gives hope for the slow development of bark beetles, and, accordingly,the growing chances of the Christmas tree to recover. However, the situation may change dramatically as soon as it gets significantly warmer, " Bobrinsky believes.
According to him, the reproduction of the bark beetle will occur throughout the Moscow region, but it will be most noticeable in its western half. In the eastern and southern parts of the region, spruce stands are much smaller, but the intensity of their drying may be higher than in the western regions.
Currently, the main part of the bark beetle population overwinters in the forest floor and, most likely, successfully, since there were no deep thaws throughout the winter, and the weather was even, according to Roslesozashchita.
In late April - early May, the Federal State Institution Roslesozashchita will start monitoring the summer intensity of overwintered bark beetles using pheromone traps.
By mid-May, the intensity of bark beetle attacks on trees will be clear. A full survey of spruce forests in the Moscow region older than 60 years will begin in the second or third decade of May, depending on the current weather.
"The examination will last about two months. According to the results of the survey, in all necessary cases, sanitary cuttings will be promptly assigned, " Bobrinsky said.

http://eco.rian.ru/danger/20110421/366733926.html

Comments

22.04.2011 11:23, Pirx

what about infidelity?

The typographer has a diapausing / wintering stage-imago. The larva should not overwinter. So what 5-10% do is not clear to me...

A friend says that in a warm May, the summer will start earlier. And at the same time, the probability of the second generation is higher.

The typographer is quite aggressive. Not dendrocton, of course, but still. It is very likely that after the drought of last summer, the plantings are weakened. Already last year, experts said that this will be a big forest entomological problems.

I was just reading Yatsentkovsky yesterday, an old book, a guide to moves, it was just about dendrokton-for example, it mentions that he likes all sorts of taxation notches, etc.

This post was edited by Pirx - 23.04.2011 22: 56

22.04.2011 18:10, Dmitry Vlasov

In the vast majority of bark beetles (including typograph), almost all stages can hibernate (although the survival rate is different). And a small part of the population overwinters at the larval stage, the years of such a "race" pass in June-early July. Doc: after the hurricane of June 26, 2010 (Yaroslavl region), in the first decade of July, the fallen spruce trees were settled by printers only once. Beetles extracted from under the bark were fresh (whole teeth on wheelbarrows, hairs, etc.) In settlements laid in May, at this time there were larvae and rarely pupae....
By the way, I doubt that 20 000 ha will die from the typographer in 2011. Last year's drought led to over-drying of the bark in populated trees, which caused an increased death of bark beetle larvae and pupae. So the stock of beetles that currently exists, in my opinion, is not able to populate all the oppressed trees. Dying out within a few years-yes!!! The number of printers will increase exponentially, and so will the damage.

23.04.2011 11:39, Dmitrii Musolin

From the point of view of physiology, only one stage (egg, larva, pupa, or imago) can overwinter (i.e. fully form diapause) in each temperate species. Otherwise, each species would have to have 3(4) diapause formation programs stored in the genome. This would also interfere with the synchronization of development (by the way, this is the main function of diapause often). There are exceptions - species that can successfully hibernate at different stages, but there are few of them. Sometimes parasitism can cause overwintering - for example, the imago of the predatory bug Picromerus bidens instead of (plus) embryonic diapause (by the way, this may be partly due to the fact that it is not possible to do this). That is, before winter, the population may have individuals at different stages of development, but if the species overwinters at the imaginal stage, then the remaining stages of this species have very low chances of surviving the winter (if the winter is mild, some fat body is accumulated). This will not be a diapause, but a cold stupor - a much less profound rest.

About overheating under the bark-an interesting moment! I'd rather agree. It would be good to know the exact data - maybe someone followed this last year and will continue this year...

23.04.2011 19:52, Dmitrii Musolin

actually, it's weird to even read that...

from the point of view of Nature and Eternity, there is no problem at all. of course, there were droughts, outbreaks on thousands of hectares, and nothing terrible. devoured here, left there, and in tens or hundreds of years the forests will recover here, and then burn down. but we are talking about forests where farming is conducted (asbe). That is, not och. I want to see how the same tens of thousands of hectares will turn into dead wood around Moscow in 2-3 years. For many years... There are the right rules for this. logging operations are also carried out. And if they are not properly conducted, to whom is the question?

By the way, in the thread about <url>, I gave a link to the pdf of AD Maslov's books about bark beetles. There is also his brochure about the effect of temperature on stem pests:

Maslov, A.D. Influence of temperature and humidity on forest stem pests / A.D. Maslov. Pushkino, VNIILM Publ., 2008, 26 p. (in Russian)

There, it causes lethal consequences. for different stages: eggs: -4C, lich: -12 ... 14C, cook: -17, adult: -24C.

23.04.2011 20:03, Hierophis

And what, bark beetles that populate hypothetically weakened spruce trees from last year's drought will easily populate normal, not weakened spruce trees? After all, there is some kind of limiting mechanism, otherwise they would have devoured all the Christmas trees

long ago, so in theory, the trees that should already be eliminated should suffer, and those that are healthy will survive this outbreak. I do not believe that just like that, because of bark beetles, a bunch of fir trees will turn into dead wood in 3 years.

Yes, and what is proper sanitary logging - in theory, it is necessary to make maps based on studies of the state of trees, their settlement by beetles, in general, you need a decent job, and who will do it?

I think everything is clear enough.

03.05.2011 19:38, Igor1962

Hieropsis: You are so close to the idea of sanitary selective logging (SVR) in conditions of nationalism, there are no words for it. As you expect it will be . Of the 20 000 cubic meters, if there is a bark beetle, then a small fraction and the rest will be mowed down and written off to the bark beetle. All permits for logging will be signed by the inter-district forest pathologist engineer and ecology regional and lesproekt will be signed in the act of forest pathology examination. The prosecutor's office will come to check and it does not go in kind .- checks all permit documents , and they are usually in order, the signatures of the right people are standing, they drank cognac with the director, decided their questions in the forest and will leave with folders stuffed with photocopies of allotment materials, survey reports, logging tickets