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.
What causes tomato plant leaves to turn yellow? Yellow leaves that have purple, distorted veins are a sign that psyllids have infested the tomato plant. Treatment involves looking on the bottom of leaves for insects, removing them and applying a pesticide to the growing area. Tomato plants that stop growing and turn yellow all over may have the curly top virus. The beet leafhopper transmits this disease by jumping from plant to plant.