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Fungal diseases; Anthracnose Glomerella cingulata Colletotrichum gloeosporioides [anamorph] . Armillaria root rot (shoestring root rot) Armillaria mellea Rhizomorpha subcorticalis [anamorph]
Azalea leafy gall can be particularly destructive to azalea leaves during the early spring. Hand picking infected leaves is the recommended method of control. [4] They can also be subject to Phytophthora root rot in moist, hot conditions. [5] Azaleas share the economically important disease Phytophthora cinnamomi with more than 3000 other plants.
This characteristic makes it easy to identify the species. The flowers have white tubes. This azalea is sometimes also called the smooth azalea for its new leaf growth has no hair, making it smooth to the touch. The leaves range from a blue-green, dark green, or a medium green, and the underside is a light white color. The leaves are usually ...
Leaves also contain carotenoids, which produce yellow, orange and brown colors. ... When and how the leaves change color depends on tree species – some have leaves that just turn brown and fall.
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Autumn leaf color is a phenomenon that affects the normally green leaves of many deciduous trees and shrubs by which they take on, during a few weeks in the autumn season, various shades of yellow, orange, red, purple, and brown. [1]
The reduction of chlorophyll production in leaves due to decreased sunlight in the autumn explains why some leaves turn yellow. However, the yellow color can attract aphids, so some trees turn the leaves red instead by injecting a bright pigment. [8] The loss of chlorophyll may also contribute to the abscission process. [citation needed]
Sometimes it helps to give the plant's pot a quarter-turn every week or so to straighten out its growth, but the better option is to increase light exposure. 5. Losing Variegation or Fenestration