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.
Fungal leaf spot disease can cause mulberry leaves to turn yellow and drop prematurely. The fungus often affects trees with poor air circulation. It is also more common in older trees or trees growing in shady areas; however, trees growing in full sun can also become infected.