Clematis leaves turn yellow due to: fungal diseases such as rust and clematis wilt; insects such as scales, whiteflies and aphids; and environmental stress. Looking for additional symptoms aids in identifying the exact problem.
Clematis wilt affects the stem, causing the foliage to wilt, whereas rust affects the leaves, causing orange or yellowish spots to appear on them. Both whiteflies and aphids feed on clematis leaves, causing them to curl towards the stem, but scales feed on branches, leading to leaf wilting and leaf drop. Over-watering causes overall yellowing of the leaves, and under-watering causes browning of the leaf tips. Lastly, over-fertilization burns both the roots and leaves of the clematis.Learn More
The longer night as summer turns into fall is responsible for the changing color of leaves in the autumn. As days grow shorter, the longer and cooler nights trigger biochemical changes in the leaves that turn them different colors, according to the U.S. Forest Service. Chlorophyll, the chemical that makes leaves green, decreases in response to shorter daylight hours, as other pigment-making chemicals appear more prominently.Full Answer >
Bamboo stalks turn yellow when the plant is very unhealthy and dying, this change is caused by a number of factors. Dehydration is the most common reason for a bamboo stalk to yellow. Going without any water for a short amount of time hardens the pores that the plant uses to bring water into the plant. This hardening is permanent, making the plant unable to hydrate itself even if water is added later.Full Answer >
Fruits turn brown due to exposure to oxygen. This causes the oxidation of phenolic compounds that are naturally present in fruit tissue. This reaction takes place in the chloroplasts by means of an enzyme called polyphenol oxidase.Full Answer >
Birch trees and aspen trees have a similar appearance, but possess significant differences, specifically in their leaves, buds, bark and abilities to tolerate extreme climates. Additionally, while aspen trees are found across the country, birch trees are primarily found only in the eastern United States and areas of Canada, according to Garden Guides.Full Answer >