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Juniperus californica is a shrub or small tree reaching 3–8 meters (10–26 feet), but rarely up to 10 m (33 ft) tall. The bark is ashy gray, typically thin, and appears to be "shredded". [5]
Juniperus deppeana (alligator juniper or checkerbark juniper) is a small to medium-sized tree reaching 10–15 metres (33–49 feet) in height. It is native to central and northern Mexico and the southwestern United States .
The plants frequently bear numerous galls caused by the juniper tip midge Oligotrophus betheli (Bibionomorpha: Cecidomyiidae); these are conspicuous pale violet-purple, produced in clusters of 5–20 together, each gall 1–2 centimetres (3 ⁄ 8 – 3 ⁄ 4 in) in diameter, with dense modified spreading scale-leaves 6–10 mm (1 ⁄ 4 – 3 ...
Extreme drought and bark beetles now threaten California's Ancient Bristlecone Pine Forest, home to Methuselah, a 4,853-year-old bristlecone pine.
In response to the unprecedented spread of bark beetles in the Rocky Mountains and other parts of the western United States, the U.S. Forest Service formed the Western Bark Beetle Research Group (WBBRG) in 2007—a collaboration between scientists from three research stations that pools knowledge and resources to better understand the threat and eventually develop a strategy to combat it. [10]
When one beetle finds a suitable tree to eat, it will release a pheremone that serves as a signal locator for other beetles to join the same location, according to the U.S. Forest Service.
A field guide published by UC Press in 2001 gives the common name Mountain Juniper for the australis population. [3] DNA studies (2006) by Adams [4] resulted in the southern population being raised to species status and it was given the common name “grand juniper” (Juniperus grandis). This name and status are recognized in the USDA Plant ...
In addition, she has researched the bark beetle outbreak, along with bark beetles and forests in relation to climate change. [ 2 ] [ 5 ] Her current research focuses more on bark beetle ecology and management, how forests are responding and adapting to climate change, and looking at the resiliency of different trees through genetics. [ 6 ]