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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.
White mold affects a wide range of hosts and causes sclerotinia stem rot. It is known to infect 408 plant species. As a nonspecific plant pathogen, [3] diverse host range and ability to infect plants at any stage of growth makes white mold a very serious disease. The fungus can survive on infected tissues, in the soil, and on living plants.
The insects appear as white, woolly spots on the tree and are fatal to the fir if left untreated. The woolly adelgid was native to central Europe where it affected the silver fir; it was introduced to the United States, where it has no known native predators, before 1900. [1]
Whiteflies are tiny insects that affect many different types of plants, including trees, vegetables, ornamental plants, and houseplants. “Multiple generations can be present at once, so they can ...
Woolly aphids and other sucking insects are often vectors of transmission for powdery mildew (a white fungus which grows on above ground parts of some plants), and other infectious diseases. Typically wooly aphids in subtemperate climates precede and are an indicator of various plant infections , including powdery mildew.
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]
Geogenanthus. Care level: Easy. This purple geo plant boasts glossy and thick little leaves, similar to a rubber tree. The round leaves have a slightly purple coloring, ideal for breaking up all ...
Platymeris biguttatus or two-spotted assassin bug is a venomous predatory true bug of west and southwest African origin ranging in size from 10–40 mm. [1] As a true bug of the order hemiptera, it has needle like mouth parts designed for sucking juices out of plants or other insects instead of chewing.