Search results
Results from the WOW.Com Content Network
Cotyledon orbiculata is an extremely variable species, one that grows to approximately 1.3 m (4.3 ft) in height. [1] It has gray-green leaves (up to 13 by 7 cm (5.1 by 2.8 in)), which naturally develop a white, powdery substance (known as farina) on their surfaces; this farina helps reflect sunlight and conserve water.
That’s powdery mildew, a fungus that affects a wide range of fruits, vegetables and flowers, coating their leaves, stems, blossoms and, in severe cases, entire plants. It isn’t pretty.
Many species of the genus Primula and ferns, such as Cheilanthes, Pityrogramma and Notholaena, as well as many genera of Crassulaceae succulent plants, produce a mealy, whitish to pale-yellow glandular secretion known as farina that is not an epicuticular wax, but consists largely of crystals of a different class of polyphenolic compounds known as flavonoids. [5]
Powdery mildew is a fungal disease that affects a wide range of plants. Powdery mildew diseases are caused by many different species of ascomycete fungi in the order Erysiphales . Powdery mildew is one of the easier plant diseases to identify, as the signs of the causal pathogen are quite distinctive.
Dudleya anthonyi is a relatively large rosette-forming succulent and is characterized by its leaves and inflorescences that are coated in a white, chalky powder. It is quite similar to its close relative, the widespread Dudleya pulverulenta , but Dudleya anthonyi is distinguished by its narrower and acute basal leaves and bracts , along with ...
Cut a few stems, directly below a leaf, at least a few inches long. Strip the bottom portion of the cuttings of any leaves. Replant the stems in a container of moist succulent soil mixture.
Cotyledon undulate, also known as silver crown or silver ruffles, is a small succulent shrub up to 50 cm tall. It has unusual grey undulating leaves that give it a very sculptural shape. Cotyledon undulata is perhaps the most widely grown Cotyledon. The stems are covered with a thick, white, coating.
Detail of the bracts on the developing floral stems and some of the rosette leaves of Dudleya pachyphytum. The succulent occupies an ecological niche at the northern end of Cedros Island, where the predominantly arid foliage gives away to pines, lichen, and D. pachyphytum, fed by the moisture brought by the marine fog. The seaward slopes are ...