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Phoma black stem is one of the most common diseases affecting the sunflower plant in North and South America. Phoma Black stem has also been known to occur in regions of Europe and Asia. In most cases, small lesions are produced, however if the infection is caused early on in the season, the sunflower plant may become severely diseased.
The following other wikis use this file: Usage on fi.wikipedia.org Keskustelu käyttäjästä:Harriv; Käyttäjä:Ppntori; Keskustelu käyttäjästä:Ppntori
Illustration of Vogel's formula of the pattern of sunflower florets for n from 1 to 500. In the SVG, hover over a floret to see its statistics and colour florets of the same colour. Width: 100%: Height: 100%
Several ornamental cultivars of H. annuus have red-colored ray florets; all of them stem from a single original mutant. [11] While the majority of sunflowers are yellow, there are branching varieties in other colors including, orange, red and purple. The petiolate leaves are dentate and often sticky.
Type Symbol Year and references Kansas state seal: Great Seal of the State of Kansas: 1861 [2]: Kansas state flower and floral emblem: Wild native sunflower ()1903 [3] [4]: Kansas state banner
The common sunflower (Helianthus annuus) is a species of large annual forb of the daisy family Asteraceae. The common sunflower is harvested for its edible oily seeds, which are often eaten as a snack food. They are also used in the production of cooking oil, as food for livestock, as bird food, and as a plantings in domestic gardens for ...
Wyethia amplexicaulis is a common herbaceous perennial plant from the northwestern United States called northern wyethia, northern mule ears, or black sunflower.Because of its tendency to grow together in dense colonies and its large, showy flowering heads it is a well known western wildflower that is often photographed.
White mold is the most common pathogen that affects sunflower and has been found to cause reduction in yield throughout the world including the United States, northern Europe, Great Britain and Russia. [6] Sclerotinia stem rot (or 'white stem rot', [7]) causes large yield losses in temperate climates, especially during cool and moist growing ...