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Puccinia thaliae is the causal agent of canna rust, a fungal disease of Canna. Symptoms include yellow to tan spots on the plant's leaves and stems. Initial disease symptoms will result in scattered sori (clustered sporangia), eventually covering the entirety of the leaf with coalescing postulates.
The holes the weevils eat in the leaves are visible because the leaf reacts causing a dark brownie purple ring to form around the hole. Pittosporum eugenioides is only a host to the adult weevil as the larvae are hosted on different pittosporums. [16] Common garden pests can cover this plant, such as Aphids and blister scale (Psyilids).
Many gardening societies have specialist variegated plants groups, such as the Hardy Plant Society's Variegated Plant Special Interest Group in the UK. In 2020, a variegated Rhaphidophora tetrasperma plant sold at auction for US$5,300. [13] In June 2021, another variegated Rhaphidophora tetrasperma plant sold at auction for US$19,297. [14]
Turnera ulmifolia grows erect, with dark toothed leaves and small, yellow-orange flowers, and is often found as a weed growing on roadsides. These yellow flowers bloom around 6:00 a.m. and wilt around 11:30 a.m. Life span for flower is around six hours. These plants can survive on minimum water and grow on walls, cement blocks, and rocks.
Pyrenophora tritici-repentis and Drechslera tritici-repentis is a necrotrophic plant pathogen of fungal origin, phylum Ascomycota. [1] The pathogen causes a disease originally named yellow spot but now commonly called tan spot, yellow leaf spot, yellow leaf blotch or helminthosporiosis.
Nectria peziza or yellow spot is an ascomycete fungus with bright yellow to orange globose fruiting bodies (0.2 – 0.4 mm across) found on rotting polypores, well rotted deadwood, bark, dung, and decaying cloth.
Lamium galeobdolon comprises four closely-related subspecies that are sometimes considered to be four separate species, one of which, the variegated yellow archangel (Lamium galeobdolon subsp. argentatum) from central Europe, is widely present as an invasive subspecies in several European countries outside of its native range and also in New ...
The plant is a perennial and will bloom during the late summer. The leaves are opposite in arrangement. [4] The leaves are broad and ovate in shape. The leaves are typically 2 1/3 to 4 3/4 inches in length. The width of the leaves are usually eight to 3 to 6 1/3 inches wide. The leaves are glabrous which gives it a smooth surface.