The Test. Tests for Epstein-Barr virus (EBV) antibodies are used to help diagnose infectious mononucleosis (mono) if a person is symptomatic but has a negative mono test.he Test. Tests for Epstein-Barr virus (EBV) antibodies are used to help diagnose infectious mononucleosis (mono) if a person is symptomatic but has a negative mono test.
leaf scar. (botany). A mark on a stem, formed by secretion of suberin and a gumlike substance, showing where a leaf has abscised. 1  Facebook. 2  Twitter.
On Japanese maples, this anthracnose appears as discreet white spots. As the disease progresses  and the longer the leaves stay wet, the worse it will be  the spots generally run together and kill larger areas of the leaf, resulting in a scorched appearance. On occasion, this anthracnose can cause twig dieback, too, especially on very succulent shoots.