National Park Nechkinskii

Udmurtia, Russia

National Park Nechkinskii

Udmurtia, Russia

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The effects of the trophic behavior of the larch casebearer Protocryptis sibiricella (Falkovitsh 1964) on the existence of sustained outbreaks of miners were monitored from 1995 to 1998. The works were performed in a forest-steppe larch forest of the Kuznetskii Alatau piedmont. The trophic behavior of larch casebearers (partial and continuous damage of needles, coincidence of the period of intense feeding of adult larvae with the period of active regenerative processes in the larch crown) provides the stable resistance of trees to secondary pests even under the strong infestation by the miners. Thus, the basis for a long lifetime of the sustained outbreaks of phyllophagous insects is provided.


The role of larch casebearer (Protocryptis sibiricella (Falkovitsh 1964) on the existence of sustained outbreaks of miners was investigated from 1995 to 1998 in a forest-steppe larch forest of the Kuznetskii Alatau piedmont. The stable pattern of the sustained outbreaks depends on the behavior of larch casebearer upon its settling. The low flying activity of the moths and their preference of damaged larch trees for oviposition are responsible for the recurring settlement of the trees.


Ermolaev I.V.,National Park Nechkinskii | Zorin D.A.,National Park Nechkinskii
Zoologicheskii Zhurnal | Year: 2011

The influence of the lime miner, Phyllonorycter issikii, on the productivity and reproductive parameters of small-leaved lime (Tilia cordata) was studied. The increase in the host-plant infestation has a negative and statistically significant effect on the linear growth of shoots and the radial increment of trunk, the formation of annual rings, the number of inflorescences, as well as on the sugar content in nectar of the lime flowers. The last factor may create a direct threat to the efficiency of local beekeeping. The lime miner is recommended to be entered into the list for objects of domestic quarantine of the Russian Federation. The lime miner needs monitoring of its population state.


Ermolaev I.V.,National Park Nechkinskii | Efremova Z.A.,Ulyanovsk State Pedagogical University | Izhboldina N.V.,National Park Nechkinskii
Zoologicheskii Zhurnal | Year: 2011

The assessment of the survival of lime leafminer (Phyllonorycter issikii Kumata) generations was performed on three sample plots in the city of Izhevsk (Udmurtia) within the period from 2001 to 2005. These studies revealed the high survival of the first P. issikii miner generation (53.2-81.7%) over a period of five years regardless of a sample plot. The mortality caused by parasitoids was minor (0.9-12.5%). Twenty-two species of parasitoids of the family Eulophidae were identified. Among them, 12 species (Cirrospilus vittatus Walker, Elachertus fenestratus Nees, Dicladocerus westwoodi Westwood, Hyssopus nigritulus (Zetterstedt), Pnigalio nemati (Westwood), Sympiesis dolichogaster Ashmead, Chrysocharisnephereus (Walker), Ch. pubicornis (Zetterstedt), Ch. phryne Walker, Closterocerus formosus Westwood, Neochrysocharis cuprifrons Erdös, and Oomyzus incertus (Ratzeburg)) were identified for the first time. The dynamics of qualitative and quantitative changes in the structure of the parasitoid complex were studied, and the basis of this complex was formed by the species of Sympiesis gordius (Walker), Chrysocharis laomedon (Walker), Pnigalio soemius (Walker), and Hyssopus geniculatus (Hartig). In most cases, the mortality of lime leafminers (15.2-36.9%) was governed by a factor of unknown nature. Probably, it was caused by feeding of dusky stink bugs ( Troilus luridus F., suckflies Blepharidopterus angulatus F. and Megacoelum infusum H.-S (Miridae) found on lime-trees.


Biogeocenotic mechanisms of the formation, existence, and extinction of sustained outbreaks of the larch casebearer Protocryptis sibiricella (Flkv.) were investigated from 1995 to 1998 in a forest-steppe larch forest at the Kuznetsk Alatau piedmont. Variation of the abundance of the leaf miner within sustained outbreaks is determined by a complex of different factors. The first factor is the efficient adaptation of the miner to the condition of the host plant. The trophic behavior of the larch casebearer leads neither to a permanent damage nor to a loss of the stable resistance of the larch trees to secondary pests. The low flight activity of adults and the preference of earlier damaged trees for oviposition result in the repeated infestation of the same larch stands. The second factor is degradation of pastures, which causes a local decrease in the abundance of parasitoids of the casebearer. Consequently, the rate of the survival of the miner generation increases. The third factor, which is the constant heterogeneous condition of the host-plant, allows the sustained outbreaks of the phyllophage to exist for a long time. The extinction of the sustained outbreaks may be caused by the competitive interaction of phyllophagous insects, indirect influence of the host-plant pathogens or extreme abiotic factors.


Ermolaev I.V.,National Park Nechkinskii | Sidorova O.V.,National Park Nechkinskii
Zoologicheskii Zhurnal | Year: 2012

Patterns of small-leaved lime (Tilia cordata Mill.) damage by the lime miner (Phyllonorycter issikii, Lepidoptera, Gracillariidae) were monitored in the city of Izhevsk from 1999 to 2002. The damage of lime tree by this miner significantly increased as the heavy metal (zinc, copper, iron, lead) pollution became stronger. The maintenance of leaves in good condition under strong determines successful use of lime trees for greening of cities.

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