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.
Several other causes and circumstances can leave the citrus tree leaves yellow. Sunburned leaves and fruit develop yellow or brown leathery areas. These discolorations generally appear on either the west or south sides of the canopy.nother cause of yellowing leaves is improper use of growth regulators -- such as 2,4-D -- used to manage premature fruit drop and increase small fruit size. When these chemicals are used incorrectly, the citrus tree leaves will curl or cup and discolor to a yellowish hue.