Evidence of injury
The ability to accurately identify infested oak trees is crucial because it will help track the GSOB's movement throughout California. This is especially important for areas which are outside of the known range of infestation since the earlier the attacks are detected, the greater the possibilities of slowing potential future spread are. To determine whether an oak is infested by GSOB there are three major symptoms to look for.
GSOB attacks can be recognized by three main different symptoms:
Please download the following GSOB field identification guide (also available at www.gsob.org):
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D-SHAPED EMERGENCE HOLES Adult exit holes signify previous GSOB attack. These emergence holes are D-shaped and about 3 mm in width. When adult development is complete, the adults chew an emergence hole through the bark and exit the tree. CROWN THINNING GSOB attacks also lead to crown thinning, which begins with premature leaf drop and progresses to twig and brach die back. |
Photos retrieved from:
i2.wp.com/www.modernhiker.com/wp-content
www.independent.com
www.saveouroaks.org
www.suwalls.com
www.depositphotos.com
personal photos (free for anyone to use)
i2.wp.com/www.modernhiker.com/wp-content
www.independent.com
www.saveouroaks.org
www.suwalls.com
www.depositphotos.com
personal photos (free for anyone to use)