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.
Crown rot will cause infected plants to develop a yellowing on the leaves while the above-ground symptom of root rot typically shows up as yellowing at the leaf margins. Pythium rot produces water-soaked lesions that appear on the leaves of infected calla lilies.