Bark beetles may cause great damage to forests by killing trees over large areas during outbreaks. So-called sanitation logging is frequently used in both Europe and North America. Despite this, there are few evaluations of the efficiency for reducing bark beetle numbers. The Eurasian spruce Ips typographus (SBB) has caused unprecedented high tree mortality recent years. Much done winter when SBB adult stage. Sanitation also affect natural enemies SBB, especially larvae long-legged flies,...

In the recent decades, Norway spruce forests (Picea abies Karst.) in Europe have been subject to large-scale tree mortality caused by bark beetle (Ips typographus L.). The outbreaks were induced storm-felling events and periods of drought, which are becoming increasingly frequent due climate change. Because storms droughts spatially affect differently, infestation patterns configuration beetles might differ between drought. this study, we examined local landscape factors associated with...

Abstract The spruce bark beetle Ips typographus is the major tree‐killing in E urasia. To increase knowledge about its seasonal flight patterns and thermal sums required for emergence, a study was conducted southern S weden from 2006 to 2010. Seasonal were recorded by pheromone traps development felling trees three times during each season. Flight began, on average, 27 A pril [after 47 degree‐days (dd) > 5 °C]. More than 50% of activity occurred after mid‐ J une, this continued ugust....

In 2018, up to 4 million m3 Norway spruce was killed by the bark beetle Ips typographus in Sweden. The event unique for Sweden, terms of both affected volume and fact that it triggered severe drought stress, not ample availability relatively defenseless storm-felled trees. outbreak continued 2019 2020, each year with twice as many trees 2018. aim this study quantify seasonal variation potential lag-effects tree defense capacity after a stress. Inoculation beetle-associated bluestain fungus,...

Abstract The pine shoot beetle, Tomicus piniperda (L.), is considered one of the most destructive pests Scots pine, Pinus sylvestris in Europe. At high population densities, its feeding shoots living trees may lead to substantial and subsequent growth losses. After a storm‐felling southern Sweden January 2005, there were amounts breeding material risk for bark beetle outbreaks. To study beetle's reproductive success, levels risks losses, we analysed samples colonized trees, counted fallen...

Abstract Two non-destructive sexing techniques suitable for use in the field and laboratory are described, tested with Warren root collar weevil, Hylobius warreni Wood (Coleoptera: Curculionidae). On second visible abdominal sternite of males is a longitudinal depression that absent on females. In addition, setae last females arranged longitudinally; radially. For first character, accuracy was 90% sex could be determined without aid magnification. The latter character slightly more reliable,...

Abstract Ips typographus is the most important tree‐killing bark beetle in Europe. In north, it overwinters either of its host tree or ground, while central Europe, overwintering trees common. Few studies have estimated winter mortality I. northern Mortality adults killed was by comparing densities per m 2 live (one winter) and dead (five winters), proportion winter), samples collected before after Sweden. Densities larvae predatory Medetera spp. (Dolichopodidae) were recorded as amount...

In the recent decades, Norway spruce forests (Picea abies Karst.) in Europe have been subject to large-scale tree mortality caused by bark beetle (Ips typographus L.). The outbreaks were induced storm-felling events and periods of drought, which are becoming increasingly frequent due climate change. Because storms droughts spatially affecting differently, infestation patterns configuration beetles might differ between drought. this study, we examined local landscape factors associated with...