Bark beetle dron aerial stump windstorm storm video shot pest Ips typographus dead, spruce and bast tree infested and attacked by the European spruce quadcopter view flying fly flight show, cutting deforestation making their way in wood larva and larvae, clear cut calamity wood small-reed caused bushgrass Calamagrostis epigejos, by bark beetle due to global, opening part of hole, non-original planting of spruce stands, caterpillar dead trees are caused by acid rains, Czech Republic, Europe