Forest after fire flame drone aerial video wild drought dry black earth ground vegetation stand green natural disaster burnt down trees Bark beetle shot pest Ips typographus dead, spruce and bast tree infested attacked European spruce quadcopter view flying fly flight show, cutting deforestation making their way wood larva and larvae, clear cut calamity wood small-reed caused bushgrass, bark beetle due global, opening part hole, non-original planting spruce stands Czech Republic, Europe