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of Udmurtia, Russia

The effects of the trophic behavior of the larch casebearer Protocryptis sibiricella (Falkovitsh, 1964) on the existence of sustained outbreak sites were monitored in 1995-1998 in a forest-steppe larch forest of the Kuznetsk Alatau foothills. The trophic behavior of the larch casebearer (partial and multiple damage to needles, coincidence of intense feeding of adult larvae with active regeneration in the larch crown) facilitates stable resistance of trees to secondary pests even at maximum densities of the miner. © 2011 Pleiades Publishing, Ltd.

During a study of the larch casebearer Protocryptis sibiricella (Falkovitsh, 1964) in a forest-steppe larch forest of the Kuznetsk Alatau foothills, the existence of its sustained outbreaks was for the first time shown to depend on the behavior of adults during oviposition. The dispersal distance of the adults was experimentally assessed. The females preferred to lay eggs on the larch needles already damaged by the same species. The attractivity of needles damaged naturally by the pest and artificially was compared. © 2011 Pleiades Publishing, Ltd.

Ermolaev I.V.,Nechkinskii National Park
Contemporary Problems of Ecology | Year: 2014

This review covers the history of invasion of the lime leafminer in Europe and the European part of Russia; it observes forage plants, leafminer entomophaga, and features of its development cycle. Biocenotic mechanisms and ecological consequences of invasion are analyzed. © 2014 Pleiades Publishing, Ltd.

Biogeocenotic mechanisms of 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 pest abundance within the sustained foci is determined by a complex of factors. The first factor is efficient adaptation of the pest to the condition of the host plant. The trophic behavior of the larch casebearer leads neither to permanent damage nor to a loss of stable resistance of the larch trees to secondary pests. Low flight activity of adults and preference of previously damaged trees for oviposition result in repeated infestation of the same larch stands. The second factor is degradation of pastures, which reduces the local abundance of the parasitoids of the casebearer and thus increases its survival rate. The third factor is the constant heterogeneous condition of the host plant which allows the sustained outbreaks of the phyllophage to exist for a long time. Extinction of sustained outbreaks may be caused by competitive interaction of phyllophagous insects, indirect influence of the host-plant pathogens or extreme abiotic factors. © 2014, Pleiades Publishing, Inc.

Ermolaev I.V.,Nechkinskii National Park | Sidorova O.V.,Nechkinskii National Park
Entomological Review | Year: 2011

The seasonal dynamics of damage to the small-leaved lime Tilia cordata by phyllophagous arthropods was monitored in Izhevsk in 1999-2002. The work was carried out in 15 test plots, 10 model trees being selected within each plot. From May 30 to September 10, damage to leaves was assessed every ten days in the same model branch selected from the lower layer in the northern part of the crown. The complex of phyllophagous arthropods of the small-leaved lime includes 33 species from 17 families and 7 orders. © 2011 Pleiades Publishing, Ltd.

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