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The lesions continue to grow, and by the end of summer form leaf spots that look like tar. [2] The spot can grow up to 1.5 inches (4 cm) in diameter. [4] A microscopic sign of the pathogen are the stroma, mats of hyphae found in the lesions. [2] These lesions can cause senescence of leaves but are mostly of cosmetic importance.
Powdery mildew is one of the easier plant diseases to identify, as the signs of the causal pathogen are quite distinctive. Infected plants display white powdery spots on the leaves and stems. [1] This mycelial layer may quickly spread to cover all of the leaves.
Cristulariella depraedans, commonly known as gray mold spot, sycamore leaf spot or bull's eye spot, is a fungal pathogen that affects maple trees (genus Acer) and certain other woody and herbaceous species. In maples, the foliage becomes affected by small grey lesions which expand and coalesce, the leaves later wilting and falling from the tree ...
Paperbark maple (Acer griseum) Acer maximowiczianum leaves. Series Emeiensia. Acer sutchuenense Franch. Series Grisea. Acer griseum (Franch.) Pax – paperbark maple;
5. Low Humidity. Light brown spots scattered across fiddle leaf fig leaves can be caused by dry air. If the brown spots in question have a pox-like look instead of being in a single area of the ...
While both poison ivy and Acer negundo have compound leaves composed of three leaflets with ragged edges, Acer negundo exhibits an opposite branching pattern, as opposed to the alternating pattern of poison ivy. [16] Like poison ivy, Acer negundo is also a noted riparian species, and can often be found growing along riverbeds and in wet soils ...
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At higher densities, this gall mite can cause leaves to become distorted and drop early. However, the damage is not significant enough to warrant control. [2] The galls produced by this mite are very similar in appearance to those caused by Aceria calaceris. [3]