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Some weed control is preventative, implementing protocols to stop weeds from invading new areas. Cultural weed control involves shaping the managed environment to make it less favorable for weeds. [56] [57] Once weeds are present in an area, a wide variety of means to destroy the weeds and their seeds can be employed. Since weeds are highly ...
Cannabis sativa is an annual herbaceous flowering plant. The species was first classified by Carl Linnaeus in 1753. [ 1 ] The specific epithet sativa means 'cultivated'.
Harvesting industrial hemp (Cannabis sativa) – This is a separate harvest for a different form of processing: The upper part of the plant with the leaves will be collected for cold pressing, while the lower part remains for producing fiber and initially it is left on the field.
ASTM D8441/D8441M defines the IICPS as the silhouette of a cannabis leaf inside an ANSI Z535 and ISO 3864 compliant black-bordered yellow warning triangle. All dimensions of the symbol and the leaf silhouette (a novel design by David and Eli Nathan) are defined in ASTM D8441/D8441M.
Datura stramonium, known by the common names thornapple, jimsonweed (jimson weed), or devil's trumpet, [2] is a poisonous flowering plant in the Daturae tribe of the nightshade family Solanaceae. [3] Its likely origin was in Central America , [ 2 ] [ 4 ] and it has been introduced in many world regions.
Cannabis (/ ˈ k æ n ə b ɪ s /) [2] is a genus of flowering plants in the family Cannabaceae that is widely accepted as being indigenous to and originating from the continent of Asia. [3] [4] [5] However, the number of species is disputed, with as many as three species being recognized: Cannabis sativa, C. indica, and C. ruderalis.
Thumbtack-like Tribulus terrestris burs are a hazard to bare feet and bicycle tires.. After the flower blooms, a fruit develops that easily falls apart into five burs. [3] The burs are hard and bear two to four sharp spines, [3] 10 mm (0.39 in) long and 4–6 mm (0.16–0.24 in) broad point-to-point.
Septoria cannabis is a species of plant pathogen from the genus Septoria that causes the disease commonly known as Septoria leaf spot. Early symptoms of infection are concentric white lesions on the vegetative leaves of cannabis plants, followed by chlorosis and necrosis of the leaf until it is ultimately overcome by disease and all living cells are then killed.