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This mycelial layer may quickly spread to cover all of the leaves. The lower leaves are the most affected, but the mildew can appear on any above-ground part of the plant. As the disease progresses, the spots get larger and denser as large numbers of asexual spores are formed, and the mildew may spread up and down the length of the plant.
Leaf spots can vary in size, shape, and color depending on the age and type of the cause or pathogen. Plants, shrubs and trees are weakened by the spots on the leaves as they reduce available foliar space for photosynthesis. Other forms of leaf spot diseases include leaf rust, downy mildew and blights. [4]
White rust is a disease in plants caused by the oomycete Albugo candida or one of its close relatives. Plants susceptible to this disease generally include members of the Brassica family. [ 1 ] White rust has been known to cause agricultural losses in fields cultivating members of this family including broccoli , cauliflower , and Indian ...
An albino corn plant with no chlorophyll (left) beside a normal plant (right) In botany, chlorosis is a condition in which leaves produce insufficient chlorophyll.As chlorophyll is responsible for the green color of leaves, chlorotic leaves are pale, yellow, or yellow-white.
The Cucurbitaceae (/ k j uː ˌ k ɜːr b ɪ ˈ t eɪ s iː ˌ iː /), [2] also called cucurbits or the gourd family, are a plant family consisting of about 965 species [3] in 101 genera. [4] ...
In the case of leaf scorch through over-fertilization, recovery may take time, requiring a treatment of a slow leaching process through drip irrigation over 24–48 hours. [ 5 ] [ 6 ] Prevention
Stegophora ulmea is characterized by chlorotic yellow spots 1 millimeter in diameter with a black center that develop early in the spring. [1] [2] [4] They darken and become raised. The black center can increase to occupy the entire chlorotic area. [4] The black spots can become about 5 millimeters in diameter. [1]
Zucchini yellow mosaic virus (ZYMV) is an aphid-borne potyvirus, regarded as a major pathogen of cucurbits in most regions of the world where these crops are cultivated. ZYMV affects all cucurbits including pumpkins , squashes , [ 1 ] vegetable marrows , courgettes , melons , watermelons , cucumbers , gherkins and various gourds especially ...