Edit. After Black September's assassination of Israeli athletes at the Munich Olympics in 1972, Prime Minister Golda Meir okays a black-box operation to hunt down and kill all involved.
Yellow pollen is produced by evergreen trees, primarily pine trees, including spruce, true cedar trees, fir trees, larch and hemlock. Although yellow pollen looks like it could cause an allergic reaction, in reality it does not trigger allergy symptoms at all. It can stain the skin and clothing, however.
Leaf yellowing is a complex process that may be caused by a range of different environmental factors. Shattering Loss of leaves, buds, petals, flowers, or even branchlets, a process called 'shattering', or 'abscission', is also a common problem in cut flowers.