Department of Agriculture (USDA) Forest Service (FS) Entomologist Beverly Bulaon has pointed out the frass, a sawdust-like debris from the boring activity of pine bark beetles or larvae in a dead Ponderosa pine trees in the Sequoia National Forest, near Posey, CA, on August 24, 2016. White resin from a pitch tube can be seen above the pile of frass. Pitch tubes are defensive wound mechanism that fills holes in bark with resin. Resin fills and pushes the beetles out the hole they made and helps protects the wound from further damage. Drought conditions have weakened the tree’s ability to e
Department of Agriculture (USDA) Forest Service (FS) Entomologist Beverly Bulaon has pointed out the frass, a sawdust-like debris from the boring activity of pine bark beetles or larvae in a dead Ponderosa pine trees in the Sequoia National Forest, near Posey, CA, on August 24, 2016. White resin from a pitch tube can be seen above the pile of frass. Pitch tubes are defensive wound mechanism that fills holes in bark with resin. Resin fills and pushes the beetles out the hole they made and helps protects the wound from further damage. Drought conditions have weakened the tree’s ability to expel the increased number of these boring beetles. Several types of beetles live in these trees during its natural lifecycle; some are beneficial while beetles such as this can kill the tree. Brown needles and downward limbs easily identify these dead pine trees. USDA Photo by Lance Cheung. For more information please see: ( ) ( ) @usda @forestservice Video about becoming a wildland firefighter ( )
Size: 1153px × 1733px
Location: USA
Photo credit: © Archistoric / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: agriculture, agriculture”, bakersfield, ca, california, cedar, county, department, fire, forest, fs, isabella, kern, kernville, lake, morality, national, pine, ponderosa, redwood, river, sequoia, service, states, tree, united, usda, wildfire, wildland, “department
