Labor Day 2016. Labor Day is an annual holiday to celebrate the economic and social contributions of workers to the strength, prosperity, and well-being of the country. In the United States, Labor Day is a federal holiday observed on the first Monday of September.
Quick Answer. Cucumber leaves often turn yellow because they are damaged by the potato leafhopper. The small leafhoppers pull sap from cucumber leaves and inject a toxin into the leaves, causing them to turn yellow or brown and appear burned. Continue Reading.
Those white spots on the plant leaves are fungal structures and spores that thrive in the warming temperatures and rains of spring. As the downy spot progresses, the upper sides of the leaves become chorotic, that is, show yellowish spots that will eventually turn brown.